Swedish pine forest (photo taken by Sonali Ranade)
Swedish pine forest (Photo taken by Sonali Ranade)Swedish pine forest (Photo: Sonali Ranade)

Can trees be tailored to absorb more carbon dioxide and thus help alleviate global warming? In the latest episode of the podcast “Om Vetenskap” the UPSC group leader Ove Nilsson and Skogforsk Tree Breeding Program Manager Thomas Kraft talk about how the carbon dioxide uptake in forest trees may be improved with modern technology. “Om Vetenskap” is produced by the Swedish Foundation for Strategic Research - SSF. The episode was released April 25.

The podcast episode “Hur skapas det perfekta trädet för koldioxidupptag?” (eng. How to create the perfect tree for carbon dioxide uptake?) was recorded in Swedish and is available at various podcast apps.

Background of the podcast episode (in Swedish)

Links to the podcast (in Swedish)



Göran Sandberg at the official farewell as rector of Umeå University at Sävargården in Umeå (photo taken 2010 by Elin Berge, MOMENT)
Göran Sandberg at the official farewell as rector of Umeå University at Sävargården in Umeå (photo taken 2010 by Elin Berge, MOMENT)Göran Sandberg at the official farewell as rector of Umeå University at Sävargården in Umeå (photo taken 2010 by Elin Berge / MOMENT

On its meeting in April, the Royal Swedish Academy of Sciences decided to award Göran Sandberg, executive director at the Knut and Alice Wallenberg Foundation, with the “Äldre Linnémedaljen i guld”. The academy motivates its decision with his outstanding efforts that have promoted Swedish research and increased its international competitiveness. Göran Sandberg is professor at the Department of Plant Physiology, Umeå University, and took an active part in establishing Umeå Plant Science Centre.

Göran Sandberg defended his thesis at the Department of Forest Genetics and Plant Physiology, SLU. After post-doc periods in the USA and in the UK, he came back to the Department of Forest Genetics and Plant Physiology and became professor in plant physiology 1989. Between 2005 and 2010 he was vice chancellor at Umeå University, before joining the Knut and Alice Wallenberg Foundation as executive director.

”Göran Sandberg’s research as well as his visions and commitment on the management level were extremely important to make UPSC to what it is now – an internationally competitive plant science centre”, says Ove Nilsson, director of UPSC. “We would like to congratulate him to this award and thank him for all his great efforts that consistently encourage us to develop our research centre further.”

The “Äldre Linnémedaljen i guld” is awarded as reward for merits for the Royal Swedish Academy of Sciences or the Academy’s institutes. The Academy gives out different “Linnémedaljer” and several other prizes besides the Nobel Prizes in physics and chemistry. Together with Göran Sandberg, seven other scientists were awarded with different prizes for their efforts to promote Swedish research.

Read more on the homepage of the Royal Swedish Academy of Sciences (in Swedish only):

Vikash Kumar on the left side (photo taken by Sunita Kushwah) and Jay Prakash Maurya on the right side (photo taken by Santosh Govind Khokarale)
Vikash Kumar on the left side (photo taken by Sunita Kushwah) and Jay Prakash Maurya on the right side (photo taken by Santosh Govind Khokarale)The two Ramalingaswami awardees Vikash Kumar (left;photo: Sunita Kushwah) and Jay Prakash Maurya (right; photo: Santosh Govind Khokarale)

The Ramalingaswami Fellowship is very prestigious in India. Only 75 Indian Nationals working in a broad range of fields within science and technology are awarded with this fellowship. Vikash Kumar, who is currently working as postdoc at UPSC, and Jay Prakash Maurya, who left UPSC by the end of 2019, are two of the 75 awardees of the competitive 2020-2021 selection.

The fellowship is given to Indian Nationals who are working overseas or who have been returned to India not more than a year ago before the application closes. For five years, fellows will receive a monthly remuneration and a research grant to allow them to build up their own research group at scientific institute, university or in a relevant industry of their choice in India. The goal is to attract highly skilled researchers that left India to work abroad by providing them an attractive opportunity to continue with their research and development studies in their home country.

“This fellowship is really a kind of boon to a young researcher who is going to start his own lab, especially at Indian universities where you get in the beginning comparatively less infrastructure facilities for the research you want to pursue than research institutes like for example UPSC”, says Jay Prakash Maurya who started to work as Assistant professor at Banaras Hindu University in Varanasi in February 2020. Vikash Kumar adds: “This gives big confidence to continue with a scientific carrier. Being among 75 gives immense pleasure to return back to my homeland, and also a big responsibility to deliver and excel in the field of science”

Vikash Kumar started in October 2014 as postdoc in Ewa Mellerowicz group at UPSC researching on cell wall biosynthesis. Since August 2019, he is working in Nathaniel Street’s group focussing on conifer genome analyses. His plan is to take up his fellowship at the Central University of Rajasthan and continue with plant cell wall research, its biogenesis and involvement in plant defence during biotic and/or abiotic stress.

“The stay at UPSC gave me the chance to learn plant cell wall biogenesis and its importance in plant growth and its potential contribution in development of sustainable ecosystems”, explains Vikash Kumar. “To move on now to a new institution, the Central University of Rajasthan, will give me ample of opportunity for further carrier establishment. I will not remember Umeå only for my carrier development, but as well for my family settlement with addition of two adorable daughters (Aashima and Sai). We are going to miss the long period of snow cover in Sweden.“

Jay Prakash Maurya joined Rishikesh Bhalerao’s group at UPSC as postdoc in August 2015 and researched on the photoperiodic control of seasonal growth. He left UPSC end of year 2019 to start a permanent position as Assistant Professor at the Department of Botany at Banaras Hindu University in his hometown Varanasi in India. He is planning to stay at his current university and do both basic and agriculturally important research.

“At UPSC I worked with poplar which is a model tree plant and whose genome is not well annotated. This led me to learn many aspects of bioinformatics and more about how to work with such not well streamed genomic systems”, explains Jay Prakash Maurya. “I will focus in my future research on seedling development in Arabidopsis, which has a comparatively simple and well annotated genome, and on tuber formation in potato, where the genome is polyploid and also not well annotated. The experience which I have gained in the last years will play a very important role in shaping my future research.”

Jay Prakash Maurya pointed out that his time at UPSC not only helped him to improve his CV with high-quality research publications in high impact journals – a main factor for getting the fellowship in his opinion. It also allowed him to expand his scientific network by getting new contacts and making new friends.

“It feels good to know to have talented good friends with a very diverse range of expertise which I could request, if needed”, says Jay Prakash Maurya. “Me and my family members had a very good time in Umeå with nice people and we miss the Swedish winter a lot. Even, my wife and kids say Umeå is the heaven on Earth, and they want to see it again at least once more in future.”

More information about the Ramalingaswami Re-entry Fellowship

For more information, please contact:

Vikash Kumar
Umeå Plant Science Centre
Department of Plant Physiology
Umeå University
Umeå, Sweden
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Twitter: @Vikash3217

Jay Prakash Maurya
Assistant Professor
Department of Botany, Institute of Science, Banaras Hindu University
Varanasi, India
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Twitter: @Prak16_Jay
Read more about Jay Prakash Maurya's research

The biosensor can give information about sugar levels without damaging the plant (photo taken by Thor Balkhed
The biosensor can give information about sugar levels without damaging the plant (photo taken by Thor Balkhed)The biosensor can give information about sugar levels without damaging the plant. Here it is placed in the stem of hybrid aspen (Populus tremula x tremuloides) that was used for the experiments. (Photo: Thor Balkhed)

Researchers at Linköping University and Umeå Plant Science Centre, Sweden, have developed biosensors that make it possible to monitor sugar levels in real time deep in the plant tissues – something that has previously been impossible. The information from the sensors may help agriculture to adapt production as the world faces climate change. The results have been published in the scientific journal iScience.

The primary source of nutrition for most of the Earth’s population is plants, which are also the foundation of the complete ecosystem on which we all depend. Global population is rising, and rapid climate change is at the same time changing the conditions for crop cultivation and agriculture.

“We will have to secure our food supply in the coming decades. And we must do this using the same, or even fewer, resources as today. This is why it is important to understand how plants react to changes in the environment and how they adapt”, says Eleni Stavrinidou, associate professor in the Laboratory of Organic Electronics, Department of Science and Technology at Linköping University.

The research group at Linköping University led by Eleni Stavrinidou has together with Totte Niittylä and his group from Umeå Plant Science Centre developed sugar sensors based on organic electrochemical transistors that can be implanted in plants.

While biosensors for monitoring sugar levels in humans are widely available, in particular the glucometer used by people who have diabetes, this technology has not previously been applied to plants. The newly developed biosensors can monitor the sugar levels of trees in real time, continuously for up to two days. The information from the sensors can be related to growth and other biological processes. Plants use sugars for energy, and sugars are also important signal substances that influence the development of the plant and its response to changes in the surrounding environment.

“The sensors now are used for basic plant science research but in the future, they can be used in agriculture to optimise the conditions for growth or to monitor the quality of the product, for example. In the long term, the sensors can also be used to guide the production of new types of plants that can grow in non-optimal conditions”, says Eleni Stavrinidou.

The mechanisms by which plant metabolism is regulated and how changes in sugar levels affect growth are still relatively unknown. Previous experiments have typically used methods that rely on detaching parts of the plant. However, the sensor developed by the research group gives information without damaging the plant and may provide further pieces of the puzzle of how plant metabolism works.

“We discovered diurnal variation in sucrose levels in the xylem sap of aspen that had not been previously observed”, says Totte Niittylä, senior lecturer at the Swedish University of Agricultural Sciences. “Sucrose is the main form of transported carbon in plants. We can now use this technology to study the effect of developmental and environmental cues on the xylem sap sucrose levels. This will help us on our quest to understand how trees allocate carbon between growth and storage.”

The research was mainly funded by the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 800926 (FET-OPEN HyPhOE). Additional funding comes from: the Wallenberg Wood Science Center, the Swedish Foundation for Strategic Research, the Knut and Alice Wallenberg Foundation, VINNOVA, the Swedish Research Council, and the Swedish Strategic Research Area in New Functional Materials (AFM) at Linköping University.

The article

Diurnal in Vivo Xylem Sap Glucose and Sucrose Monitoring Using Implantable Organic Electrochemical Transistor Sensors Chiara Diacci, Tayebeh Abedi, Jeewoong Lee, Erik O. Gabrielsson, Magnus Berggren, Daniel T. Simon, Totte Niittylä, Eleni Stavrinidou iScience 2020

Link to the Swedish news on the homepage of Linköping University

For more information, please contact:

Eleni Stavrinidou
Department of Science and Technology (ITN)
Laboratory of Organic Electronics (LOE)
Linköping University
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Phone: +46 11 36 33 52

Totte Niittylä
Umeå Plant Science Centre
Department of Forest Genetics and Plant Physiology
Swedish University of Agricultural Sciences
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Phone: +46 90 786 8434

Text: Anders Ryttarson Törneholm

Several female scientists currently working at UPSC
Several of the female scientists that are currently working at UPSCSeveral of the female scientists that are currently working at UPSC

[2021-02-11] Today is the International Day for Women and Girls in Science. We have asked three female professors at UPSC who are at different states in their career about their way to science, their career and their ideas to inspire the next generation of women in science.

The purpose of the International Day for Women and Girls in Science is to empower women and girls in science to achieve equality. It was established in 2005 by the United Nations General Assembly and implemented by UNESCO and UN-Women. According to UN-Women, 30 percent of researchers world-wide are women and they are still disadvantaged in their career.

Why did you choose to become a scientist?

Anita Sellstedt: It is my basic curiosity for natural science that has been and is still my driving force. That has led me into basic science. In addition, I have always been interested in research that could be of benefit for developing countries. This research has now turned out to also be sustainable, such as nitrogen fixation and hydrogen production by the aid of bacteria.

Åsa Strand: I was always very curious and creative, and I also wanted to do my own thing. A scientific career suited my personality.

Stéphanie Robert: To be a scientist was just obvious for me. I was also very curious and was fascinated by what science can do in our everyday life.

Do you remember a key moment that influenced your decision to go into science?

Åsa Strand: Yes, when I was in high school a relative introduced me to the work of Barbara McClintock. I can still remember how fascinated I was by the “jumping genes”. When I got to see the actual corn cobs of Barbara McClintock when I was invited to Cold Spring Harbor for a seminar - it was a special moment.

Stéphanie Robert: In my childhood, my grandmother had a very cutting-edge heart operation, and I remember being on the hospital parking lot and thinking that I wanted to participate in the scientific progress that led the surgeons to perform such an operation. I am not working in the medical field today, but we are doing basic research and you never know to which applications your results might lead in the future.

Anita Sellstedt: The key moment for me came when I had taken my last course in plant physiology and I was able to do a project on nitrogen fixation. Then I felt that “This is my research field”. The interaction between plants and bacteria, a combination of plant physiology and microbiology, was fascinating me throughout my career.

What were the biggest obstacles you had to overcome during your career?

Stéphanie Robert: At the beginning of my work as a group leader, I struggled because I was trained as a scientist by being in the lab as a PhD and post-doc fellow but not to lead and mentor other people. The science was not a problem, but many other things were such as hiring people, understanding how to make a budget, how to write successful grant applications, how to learn to not say “yes to everything”, or dealing with conflicts within the group. I am still learning every day.

Anita Sellstedt: I think that the uncertainty with fundings was the main obstacle for me. When I was a PhD student, I was funded several years by stipends and to be able to continue as a research after my PhD, I had also to apply for funding. Perhaps the new system with Assistant Professor positions that come with some fundings is better. You are evaluated after a couple of years and hopefully get the option to continue your research.

Åsa Strand: Early in my career it was to fight against the ingrained notion that women are not as career driven as men and that we do not have the same wish to excel and are rather happy to be in the background. Now that I am in leadership position this is something that I am very conscious of.

What do you think can we do to inspire the next generation of women in science?

Åsa Strand: If anything good has come out of this horrible pandemic it is that it has become clear how important science is to our society. Being part of that process is rewarding and should appeal to and inspire also the next generation of both men and women.

Anita Sellstedt: I think the best way to inspire the next generation of women in science is to have basic fundings. Next it is of importance to have a mentor system with female scientists that can meet with the newly recruited scientist and discuss both science and other things around work. Perhaps, it also would be good if the female mentor is within a similar field as the newly recruited scientist. I also think that the structure of the Departments at Umeå University of today with representatives of equal opportunities gives a basic structure that will benefit for the underrepresented group, for example women in science.

Stéphanie Robert: Seeing women from many backgrounds doing science their own way is inspiring, I think. The diversity of women in science should be the same than in the real world. The important thing is to find your own way to do science.

What skills do you think should young (female) researchers have or develop when starting their career in science nowadays?

Anita Sellstedt: The skills of most importance are to have real interest in the specific field of science, stubbornness, as well as both moral and financial support, and other female scientists to discuss with.

Åsa Strand: It is important to be smart and build your scientific profile, develop a research profile that is both unique and desirable. Define your own research question that is relevant to your specific field and that can be elevated into a more general context. Express clearly what you want and what your goals are. Accept tasks that you initially feel that you are not quite ready for, take on the challenge and make yourself ready and you will be rewarded by valuable experiences that will get you ahead.

Stéphanie Robert: Self-assessment. The most important to me is to be able to identify what are your strong and weak points. You can build on your strong points and request help on the weakest ones. Nobody knows it all, but it is good to be able to listen to constructive comments and integrate them in your way of doing things. This is valid for any gender.

The three interviewed professors from UPSC: Stéphanie Robert (left), Anita Sellstedt (middle) and Åsa Strand (right)The three interviewed professors from UPSC: Stéphanie Robert (left), Anita Sellstedt (middle) and Åsa Strand (right)

Stéphanie Robert was recently, in the end of 2020, appointed as professor at the Department of Forest Genetics and Plant Physiology at the Swedish University of Agricultural Sciences recently. She studies how plant cells require their shape and received the Sven and Ebba-Christina Hagberg Prize for her research achievements in 2019.

Read more about Stéphanie Robert’s research

Anita Sellstedt, since 2002 professor at the Department of Plant Physiology, Umeå University, is studying energy production by microorganism. She has received two prizes for the environmental impact of her research and has been for several years’ equal opportunity representative at the department. Anita Sellstedt will retire in 2021.

Read more about Anita Sellstedt’s research

Åsa Strand became professor at the Department of Plant Physiology in 2013. Her research focus is on the regulation of cellular energy metabolism. Åsa Strand received in 2019 the Physiologia Plantarum Prize from the Scandinavian Plant Physiology Society (SPPS), she is currently member of the Scientific Council for Natural and Engineering Sciences that is appointed by the Swedish Research Council and she coordinates two large SSF (Swedish Foundation for Strategic Research) project grants.

Read more about Åsa Strand’s research

Norway Spruce seedlings growing in the greenhouse (photo taken by Sonali Ranade)
Norway Spruce seedlings growing in the greenhouse (photo taken by Sonali Ranade)Norway Spruce seedlings growing in the greenhouse (photo: Sonali Ranade)

[2021-02-01] Sweden is a country with big differences in light conditions between the South and the North. Norway spruce tolerates low light or shade generally well but Sonali Ranade and Rosario García-Gil from UPSC showed now that there are latitudinal differences. Seedlings from Northern Sweden are better adapted to low light conditions than seedlings from Southern Sweden. This genetic adaptation seems to come along with a higher resistance to diseases. The results were published last week in the journal Planta.

The researchers from UPSC compared the growth of Norway spruce seedlings that derive from different latitudes in Sweden and showed that the seedlings from the north were better adapted to shady conditions than the ones from the south. When analysing the genetic set-up of the different trees, they found, among other, differences in genes involved in lignin and cell wall synthesis, in stress responses and immunity. The two researchers concluded that the northern Norway spruce populations have not only adapted to low light conditions but might be also more resistant to diseases.

“Shade causes stress to most plants. They try to grow towards light so that they can use the full light energy for their photosynthesis,” says Sonali Ranade, postdoctoral researcher in Rosario García-Gil’s research group. “In a previous study, we saw that Norway spruce seedlings are more shade tolerant than for example Scots pine seedlings. Now, we realized that this is not so simple. The seedlings from the north developed longer stems than the seedlings in the south when growing under shady conditions. This shows that Norway spruce is able to adapt to local light conditions and we think that this goes along with modifications of the lignin metabolism.”

The lignin content often decreases when plants are exposed to low light conditions and this weakens the stem. Lignin is one of the main components in cell walls and helps to make the walls stronger allowing the plant to grow upright. In the cell walls, lignin also provides a barrier for pathogens to enter the cells. By scaling up lignin and cell wall biosynthesis and in parallel activating defence related genes, the northern Norway spruce populations might be able to adapt to shady conditions and in parallel improve their resistance to diseases.

“Studying the genetic diversity of trees from the same species help us to understand how plants adapt to local climatic conditions”, explains Rosario García-Gil, group leader at the Department of Forest Genetics and Plant Physiology at the Swedish University of Agricultural Sciences that is part of UPSC. “In Northern Sweden, the trees experience extended periods of shade-like conditions during their growing season. Climate change might lead to higher temperatures, but the light conditions will not change. To know the genetic factors that allow trees to adapt to the local conditions is crucial for forest breeding.”

Norway spruce is one of the most important tree species for forest industry in Sweden. To find the best adapted trees for a certain location is one forest management strategy to deal with climate change. Genetic markers like the genes identified in this study are used as tools to characterize different tree variants. The long-term goal is to identify as many marker genes as possible for a wide range of environmental conditions, including for example light, temperature and resistance to diseases. This will allow to design forest management strategies specifically adjusted to the local conditions.

About the article:

Ranade, S.S., García-Gil, M.R. Molecular signatures of local adaptation to light in Norway spruce. Planta 253, 53 (2021). https://doi.org/10.1007/s00425-020-03517-9

The previous study:

Ranade, S.S., Delhomme, N. & García-Gil, M.R. Transcriptome analysis of shade avoidance and shade tolerance in conifers. Planta 250, 299–318 (2019). https://doi.org/10.1007/s00425-019-03160-z

For more information, please contact:

Sonali Ranade
Umeå Plant Science Centre
Department of Forest Genetics and Plant Physiology
Swedish University of Agricultural Sciences
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

María Rosario García-Gil
Umeå Plant Science Centre
Department of Forest Genetics and Plant Physiology
Swedish University of Agricultural Sciences
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Jenny Lundströmer on campus in Umeå in front of Norway spruce trees(photo taken by Sonali Ranade)
Jenny Lundströmer on campus in Umeå in front of Norway spruce trees (photo taken by Sonali Ranade)Jenny Lundströmer on campus in Umeå in front of Norway spruce trees (photo: Sonali Ranade)

[2020-01-25] How will Norway spruce behave in a changing climate? Jenny Lundströmer, industrial PhD student in Rosario García Gil’s group at UPSC and at former Bergvik Skog, investigated how warmer temperatures, more frequent spring frosts and drought affect Norway spruce from different origins. She recommends breeding not only for better growth but also for drought tolerance and other characteristics that help to adapt to a changing climate. In case of seed shortage from Swedish seed orchards, she advices Norway spruce provenances from Eastern Europe as valuable alternative. Jenny Lundströmer will defend her PhD thesis at SLU on Friday this week, 29th of January.

You investigated how Norway spruce can adapt to a changing climate. What aroused your interest into this PhD topic?

I am from a small village just below the arctic circle and grew up with the forest just besides me and have always been interested in how we can use the forest in a sustainable way and still enjoy it. The PhD topic was focussing on where to plant which provenances of Norway spruce to see which ones we should choose today that can survive the next 60 years. The project was part of the industrial graduate school in forest genetics, biotechnology and breeding and was in collaboration with Bergvik Skog that is now part of Stora Enso. For me, that sounded like a great opportunity to work more applied - which I was not doing during my masters - and combine it with my interest in forestry.

How was it to be part of the industrial graduate school that is a collaboration between the UPSC Centre for Forest Biotechnology and its industrial partners?

It was really great because we had regular meetings where we presented our projects and discussed them. I really appreciated this extra training but also the opportunity to follow the projects of the others over the years, see how they develop, discuss problems and exchange tips. Harry Wu also arranged great lectures with top professors in their field and courses that were specifically adjusted to our needs, as well as a trip to the US and Brazil where we saw some breeding institutes and plant nurseries. We also visited each other’s companies and met people there. My industrial partner was Bergvik Skog, where I did a project with seed orchards at their nursery, but I also had collaboration projects with Skogforsk and could get a deeper look into their work. I am really happy that I was part of the graduate school because I learned a lot, got additional experiences and valuable insights into industry and I found new friends through the graduate school.

What are the major threats for Norway spruce due to climate change in Sweden?

One of the biggest problems will be warmer temperatures. You could think that warmer temperatures are good because the trees can grow more as they have a longer vegetation time, but the winters will still be cold with freezing temperatures. This means that the trees have to stop their growth during autumn. There will also be more temperature backlashes in spring increasing the risk for frost damage - especially if bud burst starts earlier due to higher temperatures. In summer, higher temperatures increase the risk for drought. That is why we need trees that set their buds in time despite warmer autumns, that are able to bud burst at the right time in spring to prevent frost damage and that are drought tolerant. Both drought and spring frosts are mostly local problems. The crux will be to choose the right tree for the right place like for example trees with later bud burst on frost prone sites.

Do you think Norway spruce is able to tolerate future climate changes?

It has been growing good here for a long period and I think Norway spruce will survive the near and far future. To predict climate changes in the far future is difficult but the seedlings are the ones that are most sensitive to frost and drought, which make the prediction for the near future more valuable. One of my projects was to test how seeds from Eastern Europe with later bud burst and bud set perform when planted in the South of Sweden. It turned out that the trees are growing good there even though they start the vegetation period later than the Swedish ones. The growth rates are not as good as for trees from Swedish seed orchards but specifically on frost prone sites, the Eastern European provenances with later bud burst are a good alternative. This indicate that in a future with more spring frost events transfer of Norway spruce has to be performed for it to survive.

Which of your results is the most fascinating for you?

We analysed not only the first generation of Eastern European Norway spruce in Sweden but also second-generation material. These are trees that derive from Eastern European stands planted in Sweden that were open pollinated with Swedish populations around and which seeds were then planted out. Normally, we would assume that these trees have about 50% genetic material from the Eastern European material and 50% from the surrounding Swedish ones and that they bud burst after the Swedish material but before the Eastern European material. Astonishingly, we saw that they were closer to the Swedish population in terms of bud burst. Some other studies showed that the climate on the site where you plant a tree is affecting its seeds and we think that this might happen also here. I find it really fascinating to see that Norway spruce has the capacity to adapt this fast to the climate on its local site.

What challenges did you face during your PhD?

Everything took longer than planned but especially the last year was really challenging for me - not only because I wanted to finish my thesis but also because of Corona and all changes connected to this. I used to work from home a lot also before, but I found it strange to not be able to communicate with others in the usual way. The discussions are different if everything is online.

Do you have any recommendations for breeders, forest companies and/or forest owners?

I think that it is important to breed not only for better growth characteristics but also for trees that are able to adapt to a changing climate like for example that are more drought and frost tolerant. By comparing different clones, we saw that there are some that can deal better with drought than others. So, there is the potential. Provenances with later bud burst are better to use on frost prone sites because they are more likely to survive. I can just enhance the recommendation to use also seeds from Eastern Europe, especially as there is a shortage of seeds from Swedish seed orchards due to unregular flowering, insects and pests. Even the second generation of Eastern European trees are a good alternative, but it will be good to think about where to plant them to make sure they are suitable for the respective site.

What are your plans for the future?

First, I would like to take time for myself and my family. Then, I want to finish my papers and do some further analyses that I could not finish before. In parallel, I will look for a job. I would like to work in the forest industry. It does not have to be breeding but should be related to forestry or forest work and it would be nice to do something practical and not only computer work. In one of my projects, I joined the final assessment of the trees at the field sites. The weather was horrible, but I enjoyed doing practical work and see how the trees grow.

About the public defence:

The public defence will take place on Friday, 29th of January 2021 at SLU Umeå. Faculty opponent will be Darius Danusevičius from Vytautas Magnus University, Lithuania. Jenny Lundströmer was first supervised by Bengt Andersson Gull and later by María Rosario García Gil and co-supervised by Anna Maria Jönsson from Lund University. She was member of the industrial graduate school in forest genetics, biotechnology and breeding and worked with Bergvik Skog that is now part of Stora Enso, with Oskar Skogström as co-supervisor. At Skogforsk with which she had collaboration projects, she was co-supervised by Johan Westin and Mats Berlin. The dissertation will be live broadcasted via Zoom.

Title of the thesis: Adaption of Norway spruce (Picea abies (L.) Karst.) to current and future climatic conditions

Link to the thesis: https://pub.epsilon.slu.se/21159/

For more information, please contact:

Jenny Lundströmer
Department of Forest Genetics and Plant Physiology
Umeå Plant Science Centre
Swedish University of Agricultural Sciences
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Yan Ji (left) and her supervisor Åsa Strand (right) after the defence
Yan Ji (left) and her supervisor Åsa Strand (right) after Yan Ji's defenceYan Ji (left) and her supervisor Åsa Strand (right) after Yan Ji's defence (photo: Anne Honsel)

What are the first developmental steps when a cell turns green? This question was addressed by Yan Ji, PhD student in Åsa Strand’s group, who studied the development of chloroplasts, the sites in the cell where photosynthesis takes place. Chloroplast development is a very complex process involving a series of regulatory steps and Yan Ji could show that certain regulatory steps happen already earlier than previously assumed. She successfully defended her PhD thesis at Umeå University on Tuesday, 15th of December.

The greening process starts as soon as the cell receives light for example when a germinated seedling reaches the soil surface. The chloroplast originates from a cyanobacterium that was taken up by a eukaryotic cell. During evolution, some of the genetic information from the cyanobacterium has been transferred to the gene material of the host cell that is stored in the nucleus. Chloroplast development therefore requires a coordinated communication between the chloroplast and the nucleus. Yan Ji studied the early stages of chloroplast development in the plant Arabidopsis thaliana.

You studied chloroplast development during the greening process. What aroused your interest in this topic?

To understand photosynthesis is of course very important for plant research but I did not had very much background about the whole process of chloroplast development when I was applying for this position. However, when I started to work on this project and got to know more about it, I got more and more intrigued. And when I was then for the first time inducing the greening process in our cell culture system, I thought this is really cool.

What is the advantage of using a cell culture system to study chloroplast development?

Our project was focussing on early stages of chloroplast development. The cell culture system allowed us to better resolve these early stages temporally. When dark grown seedlings receive light, it takes about 12 to 24 hours until the chloroplasts are green and fully mature. In our cell culture system, it takes five days until the cells start to turn green after they receive light and the cells develop more synchronised. resembles the chloroplast development in true leaves, which are the leaves that develop after the seedling has reached the soil surface. The cell culture system is of course more artificial because the cells are isolated from their tissue context which plays also an important role for development. That is why we always complemented our cell culture experiments with experiments with seedlings to verify our results.

What was the most fascinating for you during your PhD? Have you experienced any unexpected surprises during your studies?

I focussed in my studies on the role of the plastid-encoded plastid RNA polymerase, called PEP. This is a multi-subunit protein complex in the chloroplast that is responsible for the activation of most of the genes needed for photosynthesis. It was thought that the fully assembled complex associated with additional proteins is only available in the light when the chloroplast is developing and becoming mature, while in the dark, PEP was thought to be mainly present in its core form consisting of just four core subunits. We wanted to study when the different subunits are recruited to the protein complex during chloroplast development and focussed on the time when the cells just started to become green. However, we realized that the fully assembled complex was already available both in our dark grown cells and in the dark grown seedlings. We could also indirectly show that the complex was already active at this stage. The difference to the more mature chloroplast was that the abundance of complexes available was much lower. There were some hints in this direction before from experiments with other plants, but we did not expect to find the fully assembled complex so early during chloroplast development in true leaves.

What was the biggest challenge you faced during your PhD?

The discovery that the full assembled PEP complex is already available much earlier than we thought was of course very fascinating but also quite challenging for me because I had to rethink and redesign my hypotheses and experiments as a whole. Some of the planned follow-up experiments did not make sense or were not feasible anymore. That was very challenging. I also faced some technical challenges when I wanted to isolate chloroplasts from the cell culture. This is a standard method for plants, but the established protocol did not work for cells from the cell culture because their cell walls seem to be stronger. We had big problems to break the cell walls which is needed to isolate the chloroplasts. We tried many different ways to get it done and this took very long time which was quite frustrating.

What are your plans for the future?

I definitely want to do a postdoc either back in China or somewhere here. During my PhD, I learned many lessons and I am really looking forward to starting a new project and applying my experiences from this time. Hopefully, I find a nice project in photobiology or photosynthesis research to be able to continue in this field. I would be very interested to study these topics in other species to see which processes and components are conserved among species.

About the public defence:

The public defence took place on Tuesday, 15th of December at Umeå University. Faculty opponent was Eevi Rintamäki, Department of Biochemistry at the University of Turku in Finland. Yan Ji's supervisor was Åsa Strand. The dissertation was live broadcasted via Zoom.

Title of the thesis: Regulation of chloroplast development during the greening process

Link to the thesis: urn:nbn:se:umu:diva-176773

For more information, please contact:

Yan Ji
Department of Plant Physiology
Umeå Plant Science Centre
Umeå University
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Kristoffer Jonsson (left) and Abdellah Lakehal (right)
Kristoffer Jonsson (left) and Abdellah Lakehal (right)Kristoffer Jonsson (left) and Abdellah Lakehal (right)

[2020-12-16] Last Friday, the Swedish Research Council announced their decision regarding the autumn call for the international postdoc grant. The projects from Kristoffer Jonsson and Abdellah Lakehal were among the approved projects. Both finished their PhD at UPSC in 2019 and are currently working as postdoc there. The grant offers them secure employment conditions for the next three years and allows them to work on their research projects abroad to acquire new competences and expand their international networks.

You are the first two postdocs bringing this research grant in this form to UPSC. How does it feel to receive this grant?

Abdellah Lakehal: I didn’t know that we were the first ones, it’s definitely an honour to bring such a prestigious grant to the institute that forged my career. I am very happy and excited at the same time.

Kristoffer Jonsson: It is a nice validation that my proposed project is of general interest, which makes me even more motivated to get started addressing my questions. Also, I’m happy that Abdellah also received this grant, since we started our PhD roughly at the same time, and followed each other throughout the years.

What are you planning to do in your project?

Kristoffer Jonsson: Within the framework of the grant, I want to examine the basis of self-organization in morphogenesis, and how endogenous mechanical cues instruct cellular growth decisions. The project is planned to involve three overall layers of methodology: cellular resolution growth tracking, mechanical measurements and 3D computational modelling.

Abdellah Lakehal: I’m interested in de novo lateral root organogenesis in plants. Lateral roots are the main determinant of root system architecture and they play crucial roles in plant productivity by ensuring an efficient uptake of water and nutrients. My project aims at uncovering the evolutionary history of the molecular networks that guide stem cell specification during lateral root organogenesis using an early divergent plant species as a model system. To achieve this goal, I will take advantage of the state-of-the-art technologies such as single-cell analysis and genome editing.

Where do you plan to go?

Abdellah Lakehal: I plan to perform my research in the lab of Prof. Tom Beeckman at VIB-UGent, Ghent, Belgium.

Kristoffer Jonsson: The plan is to join the lab of Anne-Lise Routier-Kierzkowska at the Plant Biology Research Institute (IRBV) at Montreal University, Montreal, Canada.

Why did you choose your host institution?

Kristoffer Jonsson: I mainly wanted the chance to work with Anne-Lise Routier-Kierzkowska, who is doing very exciting work in the field of plant biomechanics and computational modeling. Anne-Lise is a biophysicist, and perhaps therefore has a very different approach to biological questions from what I am used to, which I find very stimulating. Beyond my host lab, IRBV is a multidisciplinary institute, and Montreal is the home of two renowned plant research centers (IRBV and the Plant Science Dept at McGill University). Several international plant research meetings are regularly held in Montreal. Thus, I’m hoping to meet a dynamic environment.

Abdellah Lakehal: I chose VIB because it is one of the strongest and most influential research centres in the world. In one hand, VIB will provide me with easy access to all the facilities and services needed for the accomplishment of the project. On the other hand, I will have ample opportunities to develop new skills. I will be working under the guidance of Prof. Tom Beeckman, who is an internationally recognized expert in lateral root development and stem cell regulations. His lab made incredible contributions to this field. I will certainly learn a lot there. During my stay at VIB, I will also have the opportunity to establish collaborations with world-top experts in evolutionary biology.

How much time do you plan to spend at your host institution?

Abdellah Lakehal: At the moment, I plan to spend 3 years at VIB.

Kristoffer Jonsson: We haven’t decided the exact timeline yet. Besides the work situation, I also have my family to consider. I’m just starting to put this puzzle together now.

What are your next steps now?

Kristoffer Jonsson: I’m still involved in ongoing projects with the Bhalerao lab which I hope we can conclude shortly, so I will continue at UPSC/SLU at least until the summer 2021.

Abdellah Lakehal: It is hard to predict the future as goals are dynamic and change over time, however, my ultimate goal is to come back to Sweden and establish my independent research group. I plan to decode the secrets behind “stem cellness” in plants by adopting an evolutionary perspective. In other words, how and what was needed for the early divergent plant species to evolve this unique capacity allowing them to conquer land and adapt to the ever-changing environmental conditions. Acquiring such fundamental knowledge will certainly allow us to shed light on key aspects of lateral root organogenesis in the extant seed plants.

The Swedish Research Council approved 41 out of 169 project applications. The applicants must have received their PhD no more than 2 years before the call closes. The grant will be administered by a Swedish University or public organisation meaning that the applicants will be employed in Sweden while working abroad.

For questions, please contact:

Kristoffer Jonsson
Department of Forest Genetics and Plant Physiology
Umeå Plant Science Centre
Swedish University of Agricultural Sciences
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Project title: Sensing yourself: Mechanical feedback between organ curvature and cell-based decisions

Host institution: Department of Plant Physiology, Umeå University
Visiting institution: Plant Biology Research Institute (Institut de Recherche en Biologie Végétale IRBV), Université de Montréal, Canada

Abdellah Lakehal
Department of Forest Genetics and Plant Physiology
Umeå Plant Science Centre
Swedish University of Agricultural Sciences
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

Project title: Decoding the molecular basis of lateral root stem cell specification in plants

Host institution: Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
Visiting institution: Center for Plant Systems Biology, VIB-UGent, Belgium

Pine tree in winter with snow; photo by Stefan Jansson and Pushan BagPine tree in winter (Photo: Stefan Jansson & Pushan Bag)

[2020-12-15] How can conifers that are used for example as Christmas trees keep their green needles over the boreal winter when most trees shed their leaves? Science has not provided a good answer to this question but now an international team of scientists, including researchers from Umeå University, has deciphered that a short-cut in the photosynthetic machinery allows the needles of pine trees to stay green. The study was published today in the journal Nature Communications.

In winter, light energy is absorbed by the green chlorophyll molecules but cannot be utilized by the downstream reactions in the photosynthetic machinery as freezing temperatures stop most biochemical reactions. This is especially a problem in the early spring when temperatures can still be very low, but sunlight is already strong, and the excess light energy can damage the proteins of the photosynthetic machinery. The researchers showed that the photosynthetic apparatus is wired in a special way which allows pine needles to stay green all year long.

Under normal conditions, the two photosystems, the two functional units where light energy is absorbed and converted into chemical energy, are kept apart from each other to prevent a short-cut and allow efficient photosynthesis. In winter, the structure of the thylakoid membrane, where the two photosystems are located, is reorganized which brings the two photosystems in physical contact. The researchers showed that photosystem II donates energy directly to photosystem I and this short-cut mode protects the green chlorophyll and the needles when conditions become harsh.

“We have followed several pine trees growing in Umeå in northern Sweden over three seasons”, says Pushan Bag, PhD student at Umeå university, who has collected samples all around the year and made many of the analyses. “It was essential that we could work on needles “straight from outdoors” to prevent that they adjusted to the higher temperatures in the lab environment before we analysed them for example with electron microscopy which we used to visualize the structure of the thylakoid membrane.”

All plants have safety valves to deal with the excess light energy which is either dissipated as heat or as fluorescence light. However, only conifers seem to have such powerful valves that they can keep the photosynthetic apparatus intact over the extreme boreal winter. The research team combined biochemistry and ultrafast fluorescence analysis, a very sophisticated method that can resolve chlorophyll fluorescence light at a picosecond time scale. Like this, they could demonstrate how the pine needles deal with excess light energy to protect their sensitive photosynthetic apparatus from damage.

“We needed to adjust the equipment to study pine needles in cold temperatures in order to trap the unique mechanism”, explains Volha Chukhutsina from Vrije Universiteit Amsterdam, who has performed much of the ultrafast fluorescence analysis. “We also tried spruce needles but they were hard to fit in a good way into the equipment”. Alfred Holzwarth, who has developed the time-resolved fluorescence measurements adds: “The pine needles gave us the opportunity to study this shortcut mechanism - also called spill-over - as they really show an extreme adaptation.”

The study was done with pine trees, but the researchers believe that the mechanism is probably similar for other conifer species – like the typical Christmas trees spruces and firs - because their photosynthetic apparatus is similar. “This remarkable adaptation not only enjoys us during Christmas but is in fact extremely important for mankind”, says Stefan Jansson from Umeå university. “Hadn´t conifers been able to survive in extreme harsh winter climates vast areas in the northern hemisphere may not have been colonized as conifers provided firewood, housing and other necessities. Still today they form the basis of the economy in most of the circumpolar taiga region”.

About the article:

Bag P., Chukhutsina V., Zhang Z., Paul S., Ivanov A.G., Shutova T., Croce R., Holzwarth A.R., Jansson S. (2020) Direct energy transfer from photosystem II to photosystem I confers winter sustainability in Scots Pine. DOI: 10.1038/s41467-020-20137-9

For more information, please contact:

Professor Stefan Jansson
Umeå Plant Science Centre
Department of Plant Physiology
Umeå University
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Phone +46-70-6772331

Text: Stefan Jansson & Pushan Bag