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Åsa Strand, Professor at the Department of Plant Physiology at Umeå University, is appointed as the first substitute for the three teacher representatives at the University Board of Umeå University (photo: Mattias Pettersson, Umeå University).
With the start of the new term of office on January 1, Åsa Strand has been appointed as a member to the University Board of Umeå University, the highest decision-making body at the university. She will serve as the first substitute for the three teacher representatives until the end of 2027.
Åsa Strand has already previously accepted various commissions of trust at Umeå University and Umeå Plant Science Centre, as well as external roles, such as with the Swedish Research Council. As teacher representatives at the University Board, her role is to ensure that the perspectives and interests of the academic staff are considered in the decision-making process.
The University Board is responsible for making key decisions regarding the allocation of resources, setting important organizational matters, and lodging annual reports and budget documents to the Swedish government. It also sets admission regulations for undergraduate and graduate education and oversees appointment procedures.
More information about the board of Umeå University (in Swedish)
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PhD student Sanchali Nanda (front) and her supervisor Stefan Jansson (back) at the ChloroSpec instrument at Umeå Plant Science Centre (photo: Anne Honsel).
Light drives photosynthesis, but excessive light can be harmful. Plants protect themselves by converting surplus energy in their chloroplasts into heat for dissipation. PhD student Sanchali Nanda helped validate a novel instrument that monitors the stress levels of plants and used it to gain new insights on their energy dissipation mechanisms.
- You did your PhD in Stefan Jansson’s research group at Umeå Plant Science Centre. Coming from India, how was it for you to work and live in Northern Sweden?
Sanchali Nanda: I enjoy challenges, and this was a fun challenge. On my first night in Umeå, seeing the greenhouse lights glowing was an enlightening moment - I was thrilled from the start. I arrived in August when it was still bright and sunny, but everything was new: the environment, the people and the culture. I experienced my first snowfall, skied for the first time, and even learned to cycle through winter. Coming from a rather pampered background as an Indian student, I had to become more self-reliant, managing things independently and taking responsibility not just professionally but also personally. I think these are the core lessons that I carry from my five and a half years of experience in Umeå.
- You studied how plants protect themselves from too much light. Why is this important?
Sanchali Nanda: Photosynthesis is the most important process on Earth, driving oxygen evolution, food production and sustaining life - yet it remains not fully understood. While its core fundamentals are known, much more is at play. Light powers photosynthesis, but plants cannot use all of it. Once saturated, excess energy can lead to radical formation, oxidative stress and damage to the photosynthetic machinery. Such damage is costly, so plants have evolved mechanisms to dissipate surplus energy and prevent such inadvertent effects.
- What kind of mechanisms have plants developed to protect themselves?
Sanchali Nanda: Various mechanisms regulate light energy. My PhD research focused on non-photochemical quenching processes, which are photoprotective mechanisms whose molecular characterization began in the 1990s. One highly debated mechanism in the field is direct energy transfer between the two photosystems in the thylakoid membrane inside the chloroplast, commonly referred to as spillover. First described in the literature in 1976, this phenomenon is now supported by evidence from our experiments.
During photosynthesis, light is absorbed by the light-harvesting complex, which consists of proteins, chlorophylls and other pigments within the chloroplasts of plant cells. This energy is then transferred via several steps to fuel carbon fixation and sugar synthesis. When this pathway becomes saturated, excess energy can be released either as light of different wavelengths or as heat through non-photochemical quenching. There are different processes, some slower and some faster ones, involving different molecular players. The aim of my thesis was to propose a more holistic approach to describing non-photochemical quenching by integrating data from fluorescence spectra obtained from in vivo samples at physiological temperature for the first time.
- When summarising your thesis, what do you consider as the major outcome?
Sanchali Nanda: I used a novel chlorophyll fluorescence measuring technique with an instrument called ChloroSpec, which is currently exclusively available in Umeå. This instrument measures the fluorescence emitted by chlorophyll as a proxy for estimating the intensity of non-photochemical quenching processes. Since fluorescence and non-photochemical quenching are competitive processes, greater energy dissipation as heat results in reduced fluorescence emission. However, non-photochemical quenching not only affects the overall fluorescence intensity but also alters the spectral properties of the emitted light, depending on the quenching process involved.
The ChloroSpec instrument combines two functions in one: it measures fluorescence at key wavelengths with high temporal resolution while simultaneously detecting the full light spectrum. Its greatest advantage is the ability to perform these measurements on living plants, in real time and at physiological temperatures. To validate the instrument, we compared our measurements with fluorescence parameters described in the literature. I was heavily involved in troubleshooting, testing the software and contributing to its further development. This required significant effort but progressed surprisingly well. Now, we can characterise multiple fluorescence parameters with a single measurement in living plants, enabling a more holistic assessment of plant stress. We hope that many other researchers will benefit from this advancement.
Using ChloroSpec, we re-examined the roles of two key molecules, in non-photochemical quenching: PsbS, a protein that is part of photosystem II, and zeaxanthin, a yellow pigment that is part of the light-harvesting complex. Our findings revealed that PsbS facilitates quenching in the light-harvesting complex, while zeaxanthin regulates energy transfer between the two photosystems, working together to protect plants from light damage. Electron microscopy also showed how non-photochemical quenching causes structural changes in plant cells, providing a clearer understanding of how plants adapt to light stress. We expanded our model by testing hybrid aspen mutants, validating our results. Overall, our work offers new insights into the dynamic, time-dependent nature of non-photochemical quenching, extending beyond previous research focused on steady-state conditions.
- Were there any results that you did not expect or that were astonishing you?
Sanchali Nanda: What surprised me the most were the results we obtained when comparing naturally occurring aspen varieties from different latitudes in Sweden. While we theoretically expected variation, seeing up to two-fold differences in non-photochemical quenching and plant height was truly astonishing. This finding raised exciting questions about the genetic basis of this variation, and we are now exploring whether these differences are linked to specific genetic variations, though we don't have those results yet.
- Doing a PhD is often very challenging. Would you like to share some of the challenges that you had to overcome?
Sanchali Nanda: Ultimately, everything turned out positively, but I’d be remiss not to acknowledge the challenges that came along the way, both personally and professionally. I had to switch supervisors, a difficult decision, but the department was incredibly supportive, for which I am deeply grateful. I am fortunate to have found mentors who believed in me and understood my journey at a crucial time. Of course, there were also the inevitable challenges of failed experiments, modifying plans and adjusting projects. Flexibility and continuous evaluation of my work were key. Throughout this process, I discovered more about myself - my strengths and limitations - and learned how to cope with setbacks, how to talk about them openly, and how to take responsibility. It feels like a mental metamorphosis, like transitioning from unquenched fluorescence to regulated non-photochemical quenching - learning to channel energy efficiently under pressure. Now, as I near the end of my PhD, I am exhausted but content with the progress I’ve made, and I have no regrets.
- What are your plans now?
Sanchali Nanda: I am currently seeking my next challenge - a postdoc abroad. I am actively applying and have connected with researchers interested in my profile. I have identified a couple of labs that I would like to work with and am exploring ways to make this possible. In the coming months, I will remain at UPSC to wrap up some unfinished work. Two of my papers are still in progress: one has already been submitted, while the other awaits further analysis of data. I plan to take a break after my defence before diving back in to finish my final chapter in Umeå.
About the public defence:
Sanchali Nanda, Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, had defended her PhD thesis on Thursday, 6th of March 2025. Faculty opponent was Matt Johnson, Professor at the University of Sheffield, United Kingdom. The thesis was supervised by Stefan Jansson.
Title of the thesis: New light on photoprotection: Spectral resolution of non-photochemical quenching
Link to Sanchali Nanda’s PhD thesis
For more information, please contact:
Sanchali Nanda
Umeå Plant Science Centre
Department of Plant Physiology
Umeå University
Email:
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PhD student Varvara Dikaya has studied how plants adjust to cold by focussing on the protein PORCUPINE (photo: Nabila El Arbi).
Plants have developed versatile processes to react to cold temperatures. Varvara Dikaya studied PORCUPINE, a protein that is part of a hub regulating responses to environmental cues like cold. In her PhD thesis, she showed that there is not just a single link between PORCUPINE and cold signalling, but multiple intertwined passes that act simultaneously.
To acquire cold resistance, plants developed complicated temperature sensing and adaptation mechanisms. Much of the research done so far to study such temperature responses focuses on changes in gene expression and on molecules that ensure cold resistance, for example amino acids, sugars and other molecules that prevent freezing. Components of the splicing machinery like the PORCUPINE protein were not part of this picture for a long time.
“Splicing acts as a central hub controlling the information flow from DNA to RNA defining which proteins are synthesised from a certain gene,” explains Varvara Dikaya who is working in Markus Schmid’s group at the Department of Plant Physiology, Umeå University, which is part of Umeå Plant Science Centre.
“Only recently attention shifted towards splicing proteins that play a role in cold signalling. One of these proteins is PORCUPINE which is named after the spiky look of the shoot tip of its mutant. It was discovered because Arabidopsis plants with mutated porcupine gene are cold sensitive.”
A single gene can give rise to multiple proteins
Many processes affect how many RNA copies are synthesised from a certain gene and which protein information these copies contain. During splicing, some parts of the initial RNA copy are cut out, changing the resulting sequence and information of the mature RNA that is used as template for the protein synthesis. This way a single gene can give rise to multiple mature RNAs and consequently different proteins.
“Splicing is a ubiquitous process common for animals, plants and fungi,” says Varvara Dikaya. “For plants, splicing is especially important when responding to environmental cues like for example cold. Depending on the growth conditions, the mature RNA copies synthesised from one gene can drastically differ and cause a redirection in the developmental programs.”
Hundreds of proteins are involved in splicing. Together with a special RNA type, they form a biological machine, the spliceosome. The spliceosome contains a core unit of several proteins which are evolutionary conserved. PORCUPINE is one of these core proteins, but, unlike many of the other core proteins, its loss makes plants particularly sensitive to cold.
“It is quite common to see growth and development alterations or even lethal effects when one of the core splicing proteins is mutated,” continues Varvara Dikaya. “The PORCUPINE mutant appears normal under ambient temperature conditions but cannot develop properly in case of even a mild temperature drop. Already at 16 degrees, the mutant grows shorter roots with increased root hair density and much smaller rosettes than normal. This is very special.”
PORCUPINE protein is involved in multiple intertwined signalling pathways
Varvara Dikaya and her colleagues were wondering in which way the PORCUPINE protein regulates responses to cold and why its loss causes cold sensitivity. However, the answer was not easy. They found that the PORCUPINE protein is involved in multiple intertwined signalling pathways.
On the one hand, temperature directly regulated the amount of the PORCUPINE RNA copies in the cell. The colder it is, the more RNA copies of the PORCUPINE gene were produced, assuming that also more PORCUPINE protein was available for the spliceosome. On the other hand, the spliceosome is tightly connected to the machinery that synthesises RNA from DNA - timewise and also with respect to its location in the cell. When one of the processes is adjusted to dropping temperatures, the other is likely to be affected as well. PORCUPINE might just be one of the multiple core splicing proteins that are affected by a general adjustment at the spliceosome making it very difficult to identify PORCUPINE-specific responses.
The researchers also investigate which genes’ splicing is directly controlled by PORCUPINE in a temperature-dependent manner. They identified several genes and some of them were key genes regulating the temperature response in plants. Varvara Dikaya and her colleagues think that the misregulation of these genes at least partially caused the specific look of the porcupine mutant.
“If all mentioned processes are coordinated properly in time and space, plants successfully adapt to the temperature drop,” concludes Varvara Dikaya. “Our current findings show the complexity of the cold response in plants. It is important to understand all aspects and identify fundamental mechanisms that could be applied later on in a practical manner. Such knowledge will be essential to create more resilient plants capable of withstanding environmental challenges in the future, but it is still a long way to go.”
Depending on the current needs of the cell, the reassembling of the different exons and introns during the splicing process can be adjusted resulting in different mature RNA variants and consequently various proteins with different functions. This so-called alternative splicing adds an additional level of complexity but allows more flexibility to adjust to changing conditions. In plants, it is especially important in response to environmental cues like temperature changes.
The splicing process: when a gene is activated, the DNA is transcribed into RNA via the protein complex RNA polymerase. The resulting RNA copy or RNA transcript is then processed by the spliceosome that cuts out introns (regions that are not important for the protein synthesis) and joints the remaining exons (regions that contain protein information). Depending on the needs of the cell, different variants of the mature RNA are assembled by the spliceosome (illustration: Varvara Dikaya).About the public defence:
Varvara Dikaya, Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, will defend her PhD thesis on Friday, 28th of February 2025. Faculty opponent will be Richard Immink from Wageningen University and Research Centre, the Netherlands. The thesis was supervised by Markus Schmid.
Title of the thesis: Broken Sm-ring: A quest to the source of the cold sensitivity of the A.thaliana SmE1 splicing mutant
Link to Varvara Dikaya’s PhD thesis
For more information, please contact:
Varvara Dikaya
Umeå Plant Science Centre
Department of Plant Physiology
Umeå University
Email:
Text: Varvara Dikaya & Anne Honsel
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The researchers Olivier Keech and Clément Boussardon are studying pollen grains from Arabidopsis plants. Photo: Rebecca Forsberg
Scientists at Umeå University have found a way to break open the protective walls of pollen grains – one of the hardest biomaterials in the world – without damaging the inside cell and its components. This achievement opened the possibility to isolate and study mitochondria – parts of the cell essential for energy production. To their surprise, several proteins that are key for maintaining the energy production of the mitochondria, were nowhere to be found.
“Flowering plants are dependent on pollen to reproduce, and the pollen grains are very special in many ways,” says Olivier Keech, Associate Professor at the Department of Plant Physiology, Umeå University and group leader at Umeå Plant Science Centre, UPSC. He explains that each pollen grain contains a tiny capsule, a cell that carries the male genetic material necessary for the next generation of plants.
Pollen Grains: Nature's Resilient Capsules
When a pollen grain encounters a female plant of the same species, fertilization may happen and can give rise to a new generation. But immediate contact is not always a given. To survive harsh environments, pollen grain has developed a specific outer structure that protects the cell, allowing it to travel long distances with the wind or pollinators, such as insects, birds or reptiles.
“This tough outer wall is largely made of one of the most resistant biomaterials known on this planet. This makes the pollen grain wall highly resistant to environmental damage and some pollen grains can remain preserved in sedimentary rocks for millions of years,” says Olivier Keech.
Olivier Keech, Associate Professor at the Department of Plant Physiology at Umeå University is studying how mitochondria respond to stress. Photo: Johan Gunséus
That a pollen grain can survive for such long time span is thanks to an in-house energy production – the mitochondria. “It’s a tiny compartment of the cell that is essential for its survival,” says Olivier Keech.
The mitochondria have its own genetic material, essential for its biological activity, and notably for producing the energy that keeps the cell alive. But to study the pollen mitochondria, they had to break open the protective wall.
A Surprising Discovery and a Collaborative Success
The idea to study pollen mitochondria germinated at a conference in 2019. Olivier Keech and his colleague at UPSC, Clément Boussardon, presented a new technique developed in Umeå, that enables trapping and isolation of mitochondria. This innovative technique intrigued collaborators who studied pollen cells.
However, from the birth of the idea, it took a few years to reveal the secrets of pollen, quite literally. “Breaking up pollen grains and isolating intact mitochondria was truly challenging. These are biological structures, a million times smaller than a meter, encapsulated in a tiny safe – dynamite was not an option!” says Clement Boussardon, Senior Research Engineer in Keech’s group and first author of the study published in Current Biology.
Staff scientist Clément Boussardon is studying mitochondria from Arabidopsis pollen grains. Photo: Rebecca Forsberg
Clément Boussardon, together with their collaborator Matthieu Simon from INRAE in France, spent over four years perfecting their method to open the pollen grains while preserving the cell. What they discovered, was not what they expected.
“What we found was quite surprising,” says Olivier Keech. “We discovered that the proteins that are associated with maintenance and the expression of the genetic material in mitochondria, essential for keeping it alive, were nowhere to be found.”
“This is a bit like mitochondria were ready to produce energy but were not equipped for any repairs if needed. This discovery may explain why a pollen grain in the end has a limited lifetime, and why it is fine tuned to survive for the duration of its unique mission - fertilization,” says Olivier Keech.
Olivier Keech and Clément Boussardon credit their success to the multidisciplinary nature of the study, which brought together researchers from Germany, France, New Zealand, and of course Umeå. “Combining the expertise of our diverse research teams has been a great pleasure and was key to this success,” concludes Clement Boussardon.
About the scientific publication
Title: The atypical proteome of mitochondria from mature pollen grains
Clément Boussardon, Matthieu Simon, Chris Carrie, Matthew Fuszard, Etienne H. Meyer, Françoise Budar, Olivier Keech
Published in Current Biology, Doi.org/10.1016/j.cub.2024.12.037
Link to the article in Current Biology
For more information, please contact:
Olivier Keech, Associate Professor at the Department of Plant Physiology,
Umeå Plant Science Centre, Umeå University
Email:
Clément Boussardon, Senior research engineer at the Department of Plant Physiology, Umeå Plant Science Centre, Umeå University (English speaking)
Email:
Text: Rebecca Forsberg
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A digital representation of a human head with DNA strands and a balance scale, symbolizing the intersection of genetics and justice. Generated with AI by Thanarat, Adobe Stock.
Today is the 10th International Day for Women and Girls in Science. The goal is to highlight the need to advance gender equality and celebrate diversity in science. UPSC has been striving for gender balance already since 2007 and has currently achieved it, but the work to create a more diverse, inclusive and equitable environment continues.
When UPSC began analysing gender balance in 2007, the leadership realised that while PhD students and postdocs were fairly balanced, this was not the case at the group leader level. To maintain the balance from the PhD and postdoc level, UPSC implemented a programme to specifically support newly appointed group leaders. The idea was to address the imbalance by offering attractive conditions that motivate all young researchers to become group leaders – a strategy that has proven successful.
“Our goal was to achieve a gender balance of 40-60% at all carrier levels, and we hoped that a balanced environment would motivate all genders to apply. We exercise special caution during recruitment processes to prevent any bias and focus on recruiting the best-qualified person for a position,” says Ove Nilsson, Director of UPSC. “The current challenge is to maintain gender balance.”
An unbiased recruitment process was one step towards a balanced and equitable work environment, but once recruited, people should also feel comfortable and safe at their workplace. To investigate the work environment at UPSC and identify areas for improvement, UPSC conducts an annual employer survey that considers, among other things, psychological safety in the workplace, discrimination and harassment.
“We started with the annual survey in 2021 because the triennial surveys from Umeå University and SLU were difficult to compare with each other and across different years. It also did not involve postdocs on scholarships at that time, which excluded almost half of our postdocs,” explains Johannes Hanson, Head of the Department of Plant Physiology at Umeå University, one of the two departments forming UPSC.
When asked if the “atmosphere in the workplace is suitable for everybody” considering gender, age, ethnicity, et cetera, about eighty percent of the UPSC staff who participated in the 2024 survey answered yes. Less than ten percent thought that “stereotypical gender roles, norms and beliefs were expressed in a way that can lead to discrimination”. About sixty percent answered that UPSC “works for greater gender equality” and only about ten percent thought that it is not or sometimes difficult “to combine work and parenthood”.
“These values are reassuring, especially as they have been quite stable over the last few years,” says Totte Niittylä, Head of the Department of Forest Genetics and Plant Physiology at SLU, the other department that forms UPSC. “However, we have a zero-tolerance policy for any form of misbehaviour. Our results are much lower when compared to a Sweden-wide reference group, but they are not zero, showing that we cannot just lie back and relax. There is still more we can do to create a safe, diverse and inclusive work environment for everyone at UPSC.”
The purpose of the International Day for Women and Girls in Science is to empower women and girls in science, to achieve equality and close the gender gap. It was established in 2005 by the United Nations General Assembly and implemented by UNESCO and UN-Women. This year marks the tenth celebration, highlighting the theme “Unpacking STEM careers: Her Voice in Science”.
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PhD student Nabila El Arbi (right) successfully defended her PhD thesis that was supervised by Markus Schmid (left). The central dogma of biology states that DNA is transcribed into RNA, which is then translated into proteins, assuming that one gene contains the information for one protein. However, RNA modifications like alternative splicing can produce multiple proteins from a single gene. Not much is known about this in plants, but PhD student Nabila El Arbi dived into the unknown and started to enlighten it.
You did your PhD in Markus Schmid's research group at Umeå Plant Science Centre. What motivated you to move to Umeå and join Markus’ group?
Nabila El Arbi: Well, to be completely honest – I was not actively looking for a PhD. I was in the final weeks of wrapping up my master’s thesis project and was confronted with the simple yet scary question: “What do you want to do now?”. By chance, somebody at a festival told another person, who then told me, about a “really good plant science centre” in Northern Sweden. That is how I found UPSC and the open PhD position in Markus’ group. When I read the project description, I thought this was really tailored to me, building up on what I focussed on during my Bachelor’s and Master’s projects. I immediately had a head full of ideas. At the time, Markus had two PhD positions available and offered me and the other candidates to visit UPSC and meet people from his group. We got along well, and this gave me an additional motivation boost for the project.
During your PhD, you explored “the role of RNA metabolism in the context of plant development under temperature stress”. Why is it important to study this?
Nabila El Arbi: For me as a researcher, I want to know more about things that are not known or poorly understood. Very little is still known about how RNA metabolism is regulated in plants. When genes are activated, their DNA sequence is transcribed into RNA, which then serve as a protein template. This sounds very simple, but the process is much more complicated. Which gene is activated when and why and how is the transcript processed? We still lack a lot of information to answer these questions that are central to the regulation of RNA metabolism and plant development and adaptation in general. Just minor changes in the RNA machinery might have big effects. This can provide us with incredibly powerful tools to create more resilient plants, but it is really important that we first understand everything properly.
You focussed mainly on alternative splicing. What is that and why is it relevant for plant development under temperature stress?
Nabila El Arbi: It is not so easy to describe what alternative splicing is, but one can maybe explain it a bit by comparing it to one of these super awesome functional hiking trousers that contain a lot of zippers. You do not need several trousers but can only take one pair and by removing or adding parts you can adjust it to your needs. It is still the same pair of trousers, but it can be short or long, it can have several pockets or just a few. With alternative splicing, it is a bit similar. All information is stored in the DNA but the way how it is transcribed into RNA can vary. One gene can contain information for different protein variants depending on how the various parts of the gene are put together when transcribed into RNA. The fruit fly Drosophila has one gene that has about 38 000 different splice variants, meaning different RNA sequences that are produced based on the information of this one gene. At least 19 000 of them have a function. I think this is absolutely mind-blowing, especially when considering that Drosophila just has about 15 000 genes. This example illustrates the variety that can be produced by alternative splicing. Plants use this mechanism a lot to flexibly adjust their growth and development to their environment, especially when adjusting to cold or heat.
What do you consider as the major outcome of your thesis?
Nabila El Arbi: When I started my PhD, there were only two papers published about the splicing mutant that I focussed on. It is called porcupine because of its “spiky” look. This mutant grows completely normal under ambient temperature but develops severe defects under low temperature stress. The PORCUPINE gene contains information for a protein that is part of the splicing machinery but becomes more active under low temperature stress. We compared it with other splicing mutants that show similar behaviours and investigated how they are regulated at different temperatures. They all appear to be controlled at least partially by overlapping pathways, but they are still quite different from each other. It is very complex. The good thing is that we now have more data and knowledge about alternative splicing and temperature, and that helps us to formulate the questions more precisely. It is a very good starting point for people who will follow up on these projects. For me, this is one of the biggest outcomes.
You summarise your thesis with “It is really complicated”. Did you expect this complexity when you started your PhD?
Nabila El Arbi: No, not at all. When I started, I was very optimistic, but I was very quickly confronted with the fact that nothing worked as expected. The porcupine mutant was very interesting but also not very confined. The mutation affected everything from root growth to shoot growth, from flower development to leaf development – like the magic box where you take out a tissue that never ends. When we did an experiment to answer one question, the answer was often neither yes nor no. We even started to collaborate with a group in Germany and were sure that from these joint experiments, we would get a clear answer about how the PORCUPINE protein regulates alternative splicing, but the results are only clear in the sense that they are unclear. We know now much more about alternative splicing and temperature than when I started my PhD, but all our results opened up many more questions. It is really complicated.
What kind of challenges did you have to overcome during your PhD?
Nabila El Arbi: During my bachelor’s and master's projects, I was very protected. My supervisor was very well organised and gave me very clearly structured projects, which was great. When starting my PhD, I had to learn that the responsibility was now on me even though I was of course supported by Markus and his group. I had to plan the experiments, do the experiments and deal with troubleshooting. At one point, I was the person who knew most about the project. It is normal during the PhD; I just did not anticipate this in the beginning.
Then, I had to deal of course with the frustration that things did not work as expected. We were working with models that were based on results from humans and yeast, but in plants, the mechanisms seem to work completely differently. It was challenging not to get lost in the project and just accept that we might not get a clear answer even if I would repeat the experiment another time. I had to learn to let go of some projects even though they were interesting, choose what was safe and focus on succeeding with my PhD.
What are you planning to do now?
Nabila El Arbi: Ah, the scary question again. I do not know, honestly. Frankly, I just want to breathe for a moment. I have always put so much pressure on myself to not take a break, to keep moving and to start the next project right after another has ended – I do not feel like I want to do that anymore. I will take some time off now to see what possibilities are out there and then choose something that I really feel passionate about. I have applied for a position at the European Space Agency because I would really like to work in the space sector, maybe even go to space if possible. They were looking more for engineers and not for biologists, but I thought I just give it a try. Otherwise, I think I would like to take a break from academia and to try how it is to work in industry. But first, I will visit my family and some friends that I have not seen for a long time.
About the public defence:
Nabila El Arbi, Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, defended her PhD thesis on Tuesday, 17th of December 2024. Faculty opponent was Artur Jarmolowski from Adam Mickiewicz University in Poznań, Poland. The thesis was supervised by Markus Schmid.
Title of the thesis: Exploring the Role of RNA Metabolism in the Context of Plant Development under Temperature Stress
Link to Nabila El Arbi’s PhD thesis
For more information, please contact:
Nabila El Arbi
Umeå Plant Science Centre
Department of Plant Physiology
Umeå University
Email:
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For the third time in a row, UPSC is inviting Early Career Plant Scientists to visit Umeå and present their research. The goal is to motivate talented young scientists to move to Umeå and start a postdoc at UPSC. The feedback from previous participants was very positive, encouraging the organisation of a third symposium, this time in a slightly revised format. It will take place on the 26th and 27th of March 2025, with applications accepted until the 7th of January.
Many people outside of Sweden might not have heard about Umeå. Located in the North of Sweden, one might think it is at “the end of the world”, but the city offers great opportunities for research and easy access to stunning wilderness and outdoor adventures. Umeå hosts two universities, a university hospital and a growing life science and biotech scene. As part of both universities, UPSC is centrally located on the Umeå campus and offers excellent opportunities for plant scientists.
“We want to highlight the exceptional research environment here at UPSC and showcase our cutting-edge scientific projects and infrastructure”, says Stephan Wenkel, one of the three organisers of the symposium. “Our goal is to foster connections with young scientists and show them why UPSC is such a unique and inspiring place to work. We have a very supportive and collaborative environment here at UPSC, and Umeå is a great place to live.”
Great opportunity for young scientists to expand their network
One reason why UPSC focuses on early career researchers is that the Swedish system primarily allows the hiring of postdocs up to three years after their PhD. Exceptions are made for circumstances like parental leave, military service, or health-related interruptions, which extend eligibility and ensure fair opportunities for all candidates. However, the main reason is that early career researchers bring fresh perspectives, innovative ideas, and a strong drive to advance their fields.
“By connecting with young researchers early in their career, we can support their growth while benefiting from their creativity and enthusiasm, which are crucial for pushing the boundaries of plant science,” explains Laura Bacete, who has organised the previous two symposia. “For the invited candidates, this is a unique opportunity to expand their network with the scientific community, building connections that could be valuable throughout their careers - maybe not right away but in unexpected ways later on.”
Participants will receive constructive feedback on their research, helping them refine their ideas and approaches. New this time is that several UPSC group leaders will also showcase their work, encouraging participants to explore a wider range of potential research collaborations. The presentations will be followed by interactive sessions where postdocs and group leaders can engage in one-on-one meetings based on mutual interest.
More dynamic and inclusive new format
“In the past, applicants were asked to name specific group leaders they were interested in working with, which we realised could limit their exposure to the broader research environment and unintentionally favour well-established group leaders,” says Stephan Wenkel. “We think that this new approach is more dynamic and inclusive, and we hope that we can better match the research interests of the applicants and the UPSC group leaders.”
Besides stimulating scientific exchange and interaction, the programme also offers a grant-writing workshop led by Umeå University’s Research Support Office to inform about funding opportunities for postdocs. Additionally, social activities will provide the opportunity to network with researchers and staff from UPSC in a more informal environment and to hear more about postdoc life in Umeå.
“Postdoc is an incredible career stage: you’ve gained valuable knowledge and skills from your previous work, and now you have the chance to build on that foundation while learning new techniques and exploring new ideas,” adds Kelly Swarts, the third organiser of the upcoming symposium. “It is important to find a research question that one feels passionate about, but equally crucial is the relationship between the candidate and the supervisor. That is why we want to give time to get to know each other.”
The application for the symposium is still open until Tuesday, the 7th of January. Besides their CV and references, applicants are encouraged to clearly articulate in their cover letters how their expertise and interests align with the UPSC research landscape. Once the application closes, an evaluation committee will review all applications, select the most promising candidates, and invite them to the symposium in March. All applicants will be notified at the beginning of February 2025.
More information about the UPSC Symposium for Early Career Plant Scientists
For questions regarding the symposium, please contact:
Laura Bacete, Umeå Plant Science Centre, Department of Plant Physiology, Umeå University
Email:
https://www.upsc.se/laura_bacete
Kelly Swarts, Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
Email:
https://www.upsc.se/kelly_swarts
Stephan Wenkel, Umeå Plant Science Centre, Department of Plant Physiology, Umeå University
Email:
https://www.upsc.se/stephan_wenkel
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Conifers have evolved special strategies to survive the harsh winters in the north (image: Stefan Jansson and Pushan Bag).
As the festive season approaches, evergreen conifers like spruce and pine adorn homes worldwide. But while Christmas trees bring warmth and joy into our lives, they endure some of the harshest conditions on Earth in their natural habitats. Most people take it for granted that they maintain their needles lush and green in freezing winters and blinding sunlight in the boreal forests but now scientists can unwrap the science behind conifers’ winter survival.
The photosynthetic process of most green plants is highly conserved; it functions overall the same in green algae, tulips and redwood trees. Yet, there are differences and scientists are gradually understanding more about both the differences and commonalities.
Conifers have extraordinary winter survival strategies, some of them were not understood until recently. Scientists from Umeå University have, together with colleagues from UK, Canada and Bulgaria, summarized recent breakthroughs in an article published in Trends in Plant Science.
Reorganisation within the chloroplast help conifers to stay green
One of the two main findings, both of which this group of researchers have contributed to, is that conifers change the structure of their thylakoid membranes in the chloroplast where photosynthesis takes place. This makes Photosystem I (PSI) and Photosystem II (PSII), which otherwise by large remain separated, come in winter closer to each other and work together in a special way named spill-over.
“This helps them to safely dissipate extra energy and avoid damage from too much sunlight in the cold,” says Stefan Jansson, Professor at Umeå Plant Science Centre at Umeå University.
Others have previously, without understanding the mechanism, named the process ‘Sustained Quenching’ as it could put photosynthesis into a lock down mode for days.
The second strategy, operating in parallel to spillover, is that conifers use special routes for moving the electrons in photosynthesis. These paths, known as alternative electron flow, involve flavodiiron proteins and help keep the photosynthesis process balanced. This also prevents the system from becoming overloaded when there's too much light and freezing temperatures.
Conifers have evolved intricate adaptations to extreme winter conditions
In addition, the photosynthetic apparatus of conifers differs from that of flowering plants (angiosperms) in a few other ways. They lack, for example, some so-called light-harvesting proteins found in other plants.
“All together this can explain why conifers are the dominant species in boreal forests, thriving where few others can, perhaps at the expense of advantages during less challenging conditions; few conifers, if any, grow where water, nutrients and temperature conditions are all favourable” says Pushan Bag, lead author who during his doctoral studies at Umeå Plant Science Centre studied these phenomena.
Understanding these mechanisms may also aid conservation and help predict forest responses to climate change and may in the longer perspective inform strategies for breeding crops that are resilient to extreme weather conditions.
Co-author Alexander Ivanov adds: ”This paper highlights the intricate adaptations of conifers to extreme winter conditions. By combining structural, molecular, and evolutionary insights, it advances our understanding of how these trees have come to dominate some of the harshest ecosystems on Earth.”
About the scientific article
The research, titled "Photosynthetic Advantages of Conifers in the Boreal Forest," is a collaboration among leading institutions in the UK, Canada, Sweden and Bulgaria supported by the EU research programme Horizon 2020 and the Human Frontiers Science Program and other funders. The article was published in Trends in Plant Science in December 2024.
Read the full article in Trends in Plant Science
For more information, please contact:
Dr. Pushan Bag, University of Oxford
Email:
Stefan Jansson, professor at the Department of Plant Physiology and Umeå Plant Science Centre, Umeå University
Phone: +46 70 677 23 31
Email:
https://www.upsc.se/stefan_jansson
Text: Stefan Jansson, Pushan Bag, Sara-Lena Brännström (Umeå University)
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Peter Kindgren (left) and Totte Niittylä received funding from the Novo Nordisk Foundation (photo left: Fredrik Larsson; photo right: Johan Gunséus).
The Novo Nordisk Foundation has recently approved two new research projects involving UPSC researchers. Peter Kindgren received a project grant aimed at improving crop resilience and productivity in a dynamic manner. Totte Niittylä, along with two other researchers from the University of Copenhagen and the University of Helsinki, have been awarded an interdisciplinary synergy grant. Their goal is to investigate in detail how trees direct photosynthetically assimilated carbon to wood, with the ultimate aim of enhancing the carbon capture capacity of trees.
Improving resilience and productivity in crops in a dynamic manner
Peter Kindgren received a project grant and will work on a biotechnological project to improve crops. His project focuses on a fine-tuning mechanism in plants that influences their biomass and stress resilience. Central to his project is a gene that controls several processes in plants such as activating stress response mechanisms while inhibiting biomass production.
This gene’s activity is suppressed by a long non-coding RNA which is an RNA molecule that does not contain information for a protein. This RNA is produced from a DNA segment next to the gene and prevents the production of full-length RNA from the gene. Peter Kindgren and his team plan to study the interaction between these two players to find ways to adjust them to enhance plant fitness.
“Our goal is to boost biomass production when the plants are not stressed and increase their stress resilience when adverse weather is expected,” explains Peter Kindgren. “The advantage of this system will be that it can trigger a rapid, predictable and short-term response in field-grown plants during the growing season.”
The researchers intend to test their system in the model plant thale cress before applying it to cereals like wheat and barley. Their ultimate aim is to provide farmers with an additional tool to mitigate the effects of extreme weather and enhance biomass production before harvest.
Enhancing carbon capture capacity of trees
The other project funded recently by the Novo Nordisk Foundation in which Totte Niittylä is involved is tackling a different but equally important issue: the ability of trees to assimilate and store atmospheric carbon. This project brings together the expertise of Thomas Moritz (University of Copenhagen), Totte Niittylä (UPSC and Swedish University of Agricultural Sciences) and Ari-Pekka Mähönen (University of Helsinki). Together, they aim to identify factors that limit wood formation in trees.
Their goal is to create a detailed map showing how carbon is transported, processed and metabolised within wood. The researchers will work with isolated cells from different wood tissues and analyse gene activities and metabolites within these cells. They also plan to model carbon transfer between these cells using labelled carbon atoms.
“We aim to identify the enzymes and metabolic processes that restrict wood formation in trees”, says Totte Niittylä. “Trees play a crucial role in absorbing carbon dioxide from the atmosphere, but we still do not fully understand the metabolic pathways involved in this process. This knowledge gap makes it difficult to predict how much carbon dioxide trees can capture, and it also hampers the breeding efforts to improve the production of wood in fast-growing feedstocks.”
The researchers believe their findings could lead to enhancing trees’ carbon capture capabilities through breeding and biotechnological applications. They anticipate that their results will be interesting for plant biologists and breeders working with fast-growing trees and also more widely research and development teams in private companies and public organisations working on metabolism and its regulation.
More information about the projects:
Project grant
Title: A dynamic circuit to increase biomass and stress resilience in crops
Contact: Peter Kindgren, Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
Email:
Novo Nordisk Interdisciplinary Synergy grant
Title: CarbonTree: CO2 assimilation capacity of trees – releasing the sink limitation
Project partners: Thomas Moritz (University of Copenhagen), Totte Niittylä (UPSC, SLU), and Ari-Pekka Mähönen (University of Helsinki)
Contact: Totte Niittylä, Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
Email:
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Thomas Dobrenel (middle) received the UPSC Agrisera prize 2024. It was presented to him by the chair of the UPSC Board Catherine Bellini (left) and by Conny Hiljanen (right) from Agrisera (photo: Anne Honsel).At today’s UPSC Christmas lunch, the UPSC Board awarded Thomas Dobrenel with this year’s UPSC Agrisera Prize. The award acknowledged his contribution to facilitating scientific discourse at UPSC and his dedication to making UPSC a good and collaborative place to work.
Thomas Dobrenel came to UPSC in 2013 as a postdoc in Johannes Hanson’s group, where he studied carbon starvation in Arabidopsis cell cultures. In 2019, he transitioned to Ove Nilsson’s group and the UPSC Spruce Transformation Facility. There, he started to work on a project to optimise methods for genetically engineering Norway spruce and propagating it via somatic embryogenesis.
The nominations for Thomas Dobrenel highlight his contributions to organising journal clubs, seminars, and PhD and Postdoc retreats, all of which stimulate scientific discussions and knowledge exchange at UPSC. He also organises social activities that strengthen the UPSC community, and nominations pointed out his approachability and willingness to assist others.
“We believe that a good and supportive work environment is essential for good research, and dedicated people like Thomas are important. With the UPSC Agrisera Prize, we show our appreciation for such commitment,” says Catherine Bellini, chairperson of the UPSC Board. She and Conny Hiljanen from Agrisera presented the prize today to Thomas Dobrenel.
About the UPSC Agrisera Prize
Each year, UPSC awards the UPSC Agrisera Prize, sponsored by Agrisera, to recognise outstanding scientific achievements and significant contributions to improving the work environment at UPSC. Everyone working at UPSC can nominate and be nominated. The recipient is chosen by the members of the UPSC Board and announced during the traditional UPSC Christmas lunch in December. The prize includes a diploma and a travel voucher.