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Thomas Moritz - Hormonal Control of Shoot Elongation and Wood Formation Print E-mail

show_ghroup_bw The aim in my research project is to understand the mechanisms of hormonal control of shoot elongation and wood formation in the model plant Populus. We want to understand how plant hormones are involved in the control of plant development, and how different environmental cues, such as photoperiod, affect the hormonal control of growth and development. In parallel, the metabolic changes in response to hormonal and photoperiodic changes are studied by using a metabolomics approach.
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Gibberellins (GAs) are a group of tetracyclic diterpenes, some of which are essential endogenous regulators that influence growth and development events throughout the life cycle of a plant, e.g. shoot elongation, expansion and shape of leaves, flowering and seed germination. Our project is concerned with the role of GAs in plant development, and day length responses, focusing on the tree hybrid aspen (Populus tremula x P. tremuloides) as a model system. Our approach for studying the role of GAs in trees is to study endogenous expression of GA biosynthetic and signalling genes and to transform Populus with genes encoding those genes.

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Populus transformed with the AtGA20ox1 under the control of the 35S promoter shows elongated internodes, longer petioles and larger leaves, reduced root formation and increased shoot biomass. In contrast, Populus expressing the AtGA3ox1 gene under the 35S promoter exhibits no major changes in morphology. We have concluded that 20-oxida- tion is the limiting step, rather than 3β-hydroxylation, in the formation of GA1 and GA4 in elongating shoots of hybrid aspen, and that ectopic GA3ox expression alone cannot increase the flux towards bioactive GAs.
Recently, we have also characterized the GA receptor, GID1 in Populus. Four orthologs of GID1 have been identified in Populus tremula x P. tremuloides (PttGID1.1 to 1.4). When PttGID1.1 and PttGID1.3 were overexpressed in Populus with a 35S promoter, overexpressors shared several similar phenotypic traits with previously described 35S:AtGA20ox1 overexpressors, including rapid growth and increased elongation.
We are also studying the role of GAs in wood formation. This is done by both using transgenic Populus with increased levels of GAs and signalling, and by predicting where GAs are formed and perceived during wood formation. For example, we have quantified GAs and analyzed the expression of GA biosynthesis genes and genes with predicted roles in GA signalling in tangential sections across the cambial region of aspen trees (Populus tremula). The results show, for example inter alia, that the bioactive GA1 and GA4 predominantly occur in the zone of expansion of xylem cells. Studies with transgenic Populus overexpressing AtGA20ox1 or PttGID1 with 35S or a xylem-specific promoter, suggest that GAs are required for two distinct processes in wood formation with tissue-specific signalling pathways: xylogenesis, mediated by GA signalling in the cambium;, and fibre elongation in developing xylem.
moritz_3Many woody species with indeterminate growth show complete cessation of elongation growth after only a few weeks in short photoperiods. Studies in Salix have shown that GA levels are decreased after only a few days in short photo periods. In hybrid aspen transformed with the oat PHYA gene, the dwarf phenotype is correlated with a reduction in GA levels, but in short photo-periods there is no further reduction in GA contents, in marked contrast to the pattern in wild-type plants. These observations imply that GAs have an important role as signals in the photo-periodic regulation of shoot elongation. We have also been studying transgenic GA plants to elucidate how changes in GA levels and signalling affect photoperiodic growth. Studies in PHYA and GA biosynthesis/signalling overexpressors are used with transcriptomic and metabolomic approaches to elucidate the early signalling pathways in short-day induced growth cessation, including identification of new putative signalling compounds.
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Key publications

Eriksson M, Israelsson M, Olsson O, Moritz T 2000. Increased gibberellin biosynthesis in transgenic trees promotes growth, biomass production and xylem fibre length. Nature Biotech. 784-788.

Israelsson M, Mellerowicz E, Chono M, Gullberg J, Moritz T 2004 Cloning and overproduction of GA 3-oxidase in hybrid aspen trees: effects on GA homeostasis and development. Plant Physiol. 135: 221-230

Jonsson P, Johansson A, Gullberg J, Trygg J, A J, Grung B, Marklund S, Sjöström M, Antti H, Moritz T 2005 High through-put data analysis for detecting and identifying differences between samples in GC/MS-based metabolomic analyses Anal. Chem. 77: 5635-5642.

Israelsson M, Sundberg B, Moritz T 2005 Tissue-specific localisation of gibberellins in wood-forming tissues in aspen. Plant J. 44: 494-504.

Mauriat M, Moritz T 2009 Analyses of GA20ox- and GID1-overexpressing Populus suggest gibberellins play two distinct roles in wood formation. Plant J. 58: 989-1003.

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  1. Businge E, Brackmann K, Moritz T, Egertsdotter U
    Metabolite profiling reveals clear metabolic changes during somatic embryo development of Norway spruce (Picea abies)
    Tree Physiol. 2012 Feb 6
  2. Mauriat M, Sandberg LG, Moritz T
    Proper gibberellin localization in vascular tissue is required to control auxin-dependent leaf development and bud outgrowth in hybrid aspen
    The Plant Journal: 2011, 67(5), 805-816
  3. Abreu IN, Ahnlund M, Moritz T, Albrectsen BR
    UHPLC-ESI/TOFMS determination of salicylate-like phenolic gycosides in Populus tremula leaves
    Journal of Chemical Ecology: 2011 37:857-870
  4. Ma J, Hanssen M, Lundgren K, Hernández L, Delatte T, Ehlert A, Liu C-M, Schluepmann H, Dröge-Laser W, Moritz T, Smeekens S, Hanson J
    The sucrose-regulated Arabidopsis transcription factor bZIP11 reprograms metabolism and regulates trehalose metabolism
    New Phytologist: 2011, 191:733–745
  5. Madsen RK, Lundstedt T, Gabrielsson J, Sennbro CJ, Alenius GM, Moritz T, Rantapaa-Dahlqvist S, Trygg J
    Diagnostic properties of metabolic perturbations in rheumatoid arthritis
    Arthritis Research: 2011 13:R19
  6. Wuolikainen A, Moritz T, Marklund SL, Antti H, Andersen PM
    Disease-related changes in the cerebrospinal fluid metabolome inamytrophic lateral sclerosis detected by GC/TOFMS
    PLoS one: 2011 6:e17947
  7. Dubois V, Moritz T, Garcia-Martinez JL
    Comparison of the role of gibberellins and ethylene in response to submergence of two lowland rice cultivars, Senia and Bomba
    Journal of Plant Physiology: 2011 168:233-241
  8. Danielsson APH, Moritz T, Mulder H, Spégel P
    Development and optimization of a metabolomic method for analysis of adherent cell cultures
    Analytical Biochemistry: 2010 404:30-39
  9. Renberg L, Johansson AI, Shutova T, Stenlund H, Aksmann A, Raven JA, Gardeström P, Moritz T, Samuelsson G
    A metabolomic approach to study major metabolite changes during acclimation to limiting CO2 in Chlamydomonas reinhardtii
    Plant Physiology: 2010 154:187-196
  10. Krus U, Kotova O, Spegel P, Hallgard E, Sharoyko VV, Vedin A, Moritz T,  Sugden MC, Koeck T, Mulder H
    Pyruvate dehydrogenase kinase 1 controls mitochondrial metabolism and insulin secretion in INS-1 832/13 clonal beta-cells
    Biochemical Journal: 2010 429:205-213
  11. Waldenström A, Haney M, Biber B, Kavianipour M, Moritz T, Strandén P, Wikström G, Ronquist G
    Ischaemic preconditioning is related to decreasing levels of extracellular adenosine that may be metabolically useful in the at-risk myocardium: an experimental study in the pig
    Acta Physiologica: 2010 199:1-9
  12. Spégel P, Danielsson APH, Bacos K, Nagorny CLF, Moritz T, Mulder H, Filipsson K
    Metabolomic analysis of a human oral glucose tolerance test reveals fatty acids as reliable indicators of regulated metabolism
    Metabolomics: 2010 6:56-66
  13. Kozarewa I, Ibáñez C, Johansson M, Ögren E, Mozley D, Nylander E, Chono M, Moritz T, Eriksson ME
    Alteration of PHYA expression change circadian rhythms and timing of bud set in Populus
    Plant Molecular Biology: 2010 73:143-156
  14. Hoffman DE, Jonsson P, Bylesjö M, Trygg J, Antti H, Eriksson ME, Moritz T
    Changes in diurnal patterns within the Populus transcriptome and metabolome in response to photoperiod variation
    Plant, Cell & Environment: 2010 33:1298-1313
  15. Van der Merwe MJ, Osorio S, Moritz T, Nunes-Nesi A, Fernie AR
    The role and regulation of the tricarboxylic acid cycle in Solanum lycopersicum roots
    South African Journal of Botany: 2009 75:424
  16. van der Merwe MJ, Osorio S, Moritz T, Nunes-Nesi A, Fernie AR
    Decreased mitochondrial activities of malate dehydrogenase and fumarase in tomato lead to altered root growth and architecture via diverse mechanisms
    Plant Physiology: 2009 149:653-669
  17. Wuolikainen A, Hedenstrom M, Moritz T, Marklund SL, Antti H, Andersen PM
    Optimization of procedures for collecting and storing of CSF for studying the metabolome in ALS
    Amyotrophic Lateral Sclerosis: 2009 10:229-236
  18. Redestig H, Fukushima A, Stenlund H, Moritz T, Arita M, Saito K, Kusano M
    Compensation for systematic cross-contribution improves normalization of mass spectrometry based metabolomics data
    Analytical chemistry: 2009 81:7974-7980
  19. Galindo FG, Dejmek P, Lundgren K, Rasmusson AG, Vicente A, Moritz T
    Metabolomic evaluation of pulsed electric field-induced stress on potato tissue
    Planta: 2009 230:469-479
  20. Chorell E, Moritz T, Branth S, Antti H, Svensson MB
    Predictive metabolomics evaluation of nutrition-modulated metabolic stress responses in human blood serum during the early recovery phase of strenuous physical exercise
    Journal of Proteome Research: 2009 8:2966-2977
  21. Mauriat M, Moritz T
    Analyses of GA20ox- and GID1-over-expressing aspen suggest that gibberellins play two distinct roles in wood formation
    The Plant Journal: 2009 58:989-1003
  22. Petersson SV, Johansson AI, Kowalczyk M, Makoveychuk A, Wang JY, Moritz T, Grebe M, Benfey PN, Sandberg G, Ljung K
    An auxin gradient and maximum in the Arabidopsis root apex shown by high-resolution cell-specific analysis of IAA distribution and synthesis
    The Plant Cell: 2009 21:1659-1668
  23. Hytonen T, Elomaa P, Moritz T, Junttila O
    Gibberellin mediates daylength-controlled differentiation of vegetative meristems in strawberry (Fragaria x ananassa Duch)
    BMC Plant Biology: 2009 9:18, 12 pp
  24. Frenkel M, Külheim C, Johansson Jänkänpää H, Skogström O, Dall'Osto L, Ågren J, Bassi R, Moritz T, Moen J, Jansson S
    Improper excess light energy dissipation in Arabidopsis results in a metabolic reprogramming
    BMC Plant Biology: 2009 9:12
  25. Zheng BS, Rönnberg E, Virtanen L, Salminen TA, Lundgren K, Moritz T, Edqvist J
    Arabidopsis sterol carrier protein-2 is required for normal development of seeds and seedlings
    Journal of Expreimental Botany: 2008 59(12):3485-3499
  26. Van Der Merwe MJ, Osorio S, Moritz T, Nunes-Nesi A, Fernie AR
    Decreased mitochondrial activities of malate dehydrogenase and fumarase in Solanum lycopersicum lead to altered root growth and architecture via diverse mechanisms
    Plant Physiology: 2008 149:653-669
  27. Bylesjö M, Nilsson R, Srivastava V, Grönlund A, Johansson AI, Jansson S, Karlsson J, Moritz T, Wingsle G, Trygg J
    Integrated Analysis of Transcript, Protein and Metabolite Data To Study Lignin Biosynthesis in Hybrid Aspen
    Journal of Proteome Research: 2009 8:199-210
  28. Depuydt S, Dolezal K, Van Lijsebettens M, Moritz T, Holsters M, Vereecke D
    Modulation of the hormone setting by Rhodococcus fascians results in ectopic KNOX activation in Arabidopsis
    Plant Physiology: 2008 146:1267-1281
  29. Andersen G, Björnberg O, Polakova S, Pynyaha Y, Rasmussen A, Moller K, Hofer A, Moritz T, Sandrini MPB, Merico A-M, Compagno C, Åkerlund H-E, Gojkovic Z, Piskur J
    A second pathway to degrade pyrimidine nucleic acid precursors in eukaryotes
    Journal of Molecular Biology: 2008 380:656-666
  30. Gallego-Giraldo L, Gisbert C, Garcia-Martinez JL, Moritz T, Lopez-Diaz I
    Gibberellin homeostasis in tobacco is regulated by gibberelllin metabolism genes with different gibberellin sensitivity
    Plant and Cell Physiology: 2008 49:679-690
  31. Guy C, Kopka J, Moritz T
    Plant metabolomics coming of age
    Physiologia Plantarum: 2008 132:113-116
  32. Gutierrez L, Mauriat M, Guénin S, Pelloux J, Lefebvre JF, Louvet R, Rusterucci C, Moritz T, Guerineau F, Bellini C, Van Wuytswinkel O
    The lack of a systematic validation of reference genes: a serious pitfall undervalued in reverse transcription-polymerase chain reaction (RT-PCR) analysis in plants.
    Plant Biotechnology Journal: 2008 6:609-618
  33. Men S, BouttéY, Ikeda Y, Li X, Palme K, Stierhof YD, Hartmann MA, Moritz T, Grebe M
    Sterol-dependent endocytosis mediates post-cytokinetic acquisition of PIN2 auxin efflux carrier polarity
    Nature Cell Biology: 2008 10:237-244
  34. De Grauwe L, Chaerle L, Dugardeyn J, Decat J, Rieu I, Vriezen WH, Moritz T, Beemster GTS, Phillips AL, Harberd NP, Hedden P, Van Der Straeten D
    Reduced gibberellin response effects ethylene biosynthesis and responsiveness in the Arabidopsis gai eto2-1 double mutant
    New Phytologist: 2008 177:128-141
  35. Bruce SJ, Jonsson P, Antti H., Cioarec O, Trygg J, Marklund SL, Moritz T
    Evaluation of a protocol for metabolic prifiling studies on human blood plasma by combined ultra-performance liquid chromatography/mass spectrometry: From extraction to data analysis
    Analytical Biochemistry: 2008 372: 237-249
  36. Wiklund S, Johansson E, Sjöström L, Mellerowicz EJ, Edlund U, Shockcor JP, Gottfries J, Moritz T, Trygg J
    Visualization of GC/TOF-MS-based metabolomics data for identification of biochemically interesting compounds using OPLS class models
    Analytical Chemistry: 2008 80: 115-122
  37. Bylesjö M, Eriksson D, Kusano M, Moritz T, Trygg J
    Data integration in plant biology: the O2PLS method for combined modeling of transcript and metabolite data
    Plant Journal: 2008 52:1181-1191
  38. Vandenbussche F, Vancompernolle B, Rieu I, Ahmad M, Phillips A, Moritz T, Hedden P, Van der Straeten D
    Ethylene-induced Arabidopsis hypocotyl elongation is dependent on but not mediated by gibberellins
    Journal of Experimental Botany: 2007 58:4269-4281
  39. Kusano M, Fukushima A, Arita M, Jonsson P, Moritz T, Kobayashi M, Hayashi N, Tohge T, Saito K
    Unbiased characterization of genotype-dependent metabolic regulations by metabolomic approach in Arabidopsis thaliana
     BMC Systems Biology: 2007 1:53
  40. Thysell E, Pohjanen E, Lindberg J, Schuppe-Koistinen I, Moritz T, Jonsson P, Antti H
    Reliable profile detection in comparative metabolomics
    OMICS: 2007 11:209-224
  41. Kusano M, Fukushima A, Kobayashi M, Hayashi N, Jonsson P, Moritz T, Ebana K, Saito K
    Application of a metabolomic method combining one- dimensional and two- dimensional gas chromatography- time- of- flight/mass spectrometry to metabolic phenotyping of natural variants in rice
    Journal of Chromatography B: 2007 855:71-79
  42. Björklund S, Antti H, Uddestrand I, Moritz T, Sundberg B
    Cross-talk between gibberellin and auxin in development of Populus wood: gibberellin stimulates polar auxin transport and has a common transcriptome with auxin
    The Plant Journal: 2007 52:499-511
  43. Bylesjo M, Eriksson D, Sjodin A, Jansson S, Moritz T, Trygg J
    Orthogonal projections to latent structures as a strategy for microarray data normalization.
    BMC Bioinformatics 2007, 8:207.
  44. Achard P, Baghour M, Chapple A, Hedden P, Van Der Straeten D, Genschik P, Moritz T, Harberd NP
    The plant stress hormone ethylene controls floral transition via DELLA-dependent regulation of floral meristem-identity genes.
    Proceedings of the National Academy of Sciences of the United States of America: 2007 104:6484-6489
  45. Druart N, Johansson A, Baba K, Schrader J, Sjödin A, Bhalerao RR, Resman L, Trygg J, Moritz T, Bhallerao RP
    Environmental and hormonal regulation of the activity-dormancy cycle in the cambial meristem involves stage-specific modulation of transcriptional and metabolic networks
    The Plant Journal: 2007 50:557-573
  46. Pohjanen E, Thysell E, Lindberg J, Schuppe-Koistinen I, Moritz T, Jonsson P, Antti H
    Statistical multivariate metabolite profiling for aiding biomarker pattern detection and mechanistic interpretations in GC/MS based metabolomics
    Metabolomics: 2007 2:257-268
  47. Bylesjo M, Sjodin A, Eriksson D, Antti H, Moritz T, Jansson S, Trygg J
    MASQOT-GUI: spot quality assessment for the two-channel microarray platform
    Bioinformatics: 2006 22:2554-2555
  48. Keller T, Abbott J, Moritz T, Doerner P
    Arabidopsis REGULATOR OF AXILLARY MERISTEMS1 controls a leaf axil stem cell niche and modulates vegetative development
    Plant Cell: 2006 18:598-611
  49. Andersson-Gunneras S, Mellerowicz EJ, Love J, Segerman B, Ohmiya Y, Coutinho PM, Nilsson P, Henrissat B, Moritz T, Sundberg B
    Biosynthesis of cellulose-enriched tension wood in Populus: global analysis of transcripts and metabolites identifies biochemical and developmental regulators in secondary wall biosynthesis
    The Plant Journal: 2006 45:144-165
  50. Achard P, Cheng H, De Grauwe L, Decat J, Schoutteten H, Moritz T, Van der Straeten D, Peng JR, Harberd NP
    Integration of plant responses to environmentally activated phytohormonal signals
    Science: 2006 311:91-94
  51. Benschop JJ, Bou J, Peeters AJM, Wagemaker N, Guhl K, Ward D, Hedden P, Moritz T, Voesenek L
    Long-term submergence-induced elongation in Rumex palustris requires abscisic acid-dependent biosynthesis of gibberellin
    Plant Physiology: 2006 141:1644-1652
  52. Jonsson P, Johansson ES, Wuolikainen A, Lindberg J, Schuppe-Koistinen I, Kusano M, Sjostrom M, Trygg J, Moritz T, Antti H
    Predictive metabolite profiling applying hierarchical multivariate curve resolution to GC-MS datas - A potential tool for multi-parametric diagnosis
    Journal of Proteome Research: 2006 5:1407-1414
  53. King RW, Moritz T, Evans LT, Martin J, Andersen CH, Blundell C, Kardailsky I, Chandler PM
    Regulation of flowering in the long-day grass Lolium temulentum by Gibberellins and the FLOWERING LOCUS T gene
    Plant Physiology: 2006 141:498-507
  54. Ruonala R, Rinne PLH, Baghour M, Moritz T, Tuominen H, Kangasjarvi J
    Transitions in the functioning of the shoot apical meristem in birch (Betula pendula) involve ethylene
    Plant Journal: 2006 46:628-640
  55. Jiye A, Trygg J, Gullberg J, Johansson AI, Jonsson P, Antti H, Marklund SL, Moritz T
    Extraction and GC/MS analysis of the human blood plasma metabolome
    Anal Chem: 2005 77:8086-8094
  56. Jonsson P, Bruce SJ, Moritz T, Trygg J, Sjostrom M, Plumb R, Granger J, Maibaum E, Nicholson JK, Holmes E, Antti H
    Extraction, interpretation and validation of information for comparing samples in metabolic LC/MS data sets
    Analyst: 2005 130:701-707
  57. Schauer N, Steinhauser D, Strelkov S, Schomburg D, Allison G, Moritz T, Lundgren K, Tunali UR, Forbes MG, Willmitzer L, Fernie AR, Kopka J
    GC-MS libraries for the rapid identification of metabolites in complex biological samples
    FEBS Lett: 2005 579:1332-1337
  58. Jonsson P, Johansson AI, Gullberg J, Trygg J, A J, Grung B, Marklund S, Sjostrom M, Antti H, Moritz T
    High-throughput data analysis for detecting and identifying differences between samples in GC/MS-based metabolomic analyses
    Anal Chem: 2005 77:5635-5642
  59. Israelsson M, Sundberg B, Moritz T
    Tissue-specific localization of gibberellins and expression of gibberellin-biosynthetic and signaling genes in wood-forming tissues in aspen
    Plant J: 2005 44:494-504
  60. Jonsson P, Gullberg J, Nordstrom A, Kusano M, Kowalczyk M, Sjostrom M, Moritz T
    A strategy for identifying differences in large series of metabolomic samples analyzed by GC/MS
    Anal Chem: 2004 76:1738-1745
  61. Curaba J, Moritz T, Blervaque R, Parcy Fo, Raz V, Herzog M, Vachon G
    AtGA3ox2, a key gene responsible for bioactive gibberellin biosynthesis, is regulated during embryogenesis by LEAFY COTYLEDON2 and FUSCA3 in Arabidopsis
    Plant Physiol: 2004 136:3660-3669
  62. Israelsson M, Mellerowicz E, Chono M, Gullberg J, Moritz T
    Cloning and overproduction of gibberellin 3-oxidase in hybrid aspen trees. Effects on gibberellin homeostasis and development
    Plant Physiol: 2004 135:221-230
  63. Nordstrom A, Tarkowski P, Tarkowska D, Dolezal K, Astot C, Sandberg G, Moritz T
    Derivatization for LC electrospray ionization-MS: A tool for improving reversed-phase separation and ESI responses of bases, ribosides, and intact nucleotides
    Analytical Chemistry: 2004 76:2869-2877
  64. Nordstrom A, Tarkowski P, Tarkowska D, Dolezal K, Astot C, Sandberg G, Moritz T
    Derivatization for LC-electrospray ionization-MS: a tool for improving reversed-phase separation and ESI responses of bases, ribosides, and intact nucleotides
    Anal Chem: 2004 76:2869-2877
  65. Gullberg J, Jonsson P, Nordstrom A, Sjostrom M, Moritz T
    Design of experiments: an efficient strategy to identify factors influencing extraction and derivatization of Arabidopsis thaliana samples in metabolomic studies with gas chromatography/mass spectrometry
    Anal Biochem: 2004 331:283-295
  66. Corbesier L, Kustermans G, Perilleux C, Melzer S, Moritz T, Havelange A, Bernier G
    Gibberellins and the floral transition in Sinapis alba
    Physiologia Plantarum: 2004 122:152-158
  67. Jiye A, Trygg J, Gullberg J, Moritz T, Marklund S
    Global analysis of low-molecular-weight compounds in human plasma using GC/TOF-MS
    Drug Metabolism Reviews: 2004 36:246-246
  68. Cox MCH, Benschop JJ, Vreeburg RAM, Wagemaker CAM, Moritz T, Peeters AJM, Voesenek LACJ
    The roles of ethylene, auxin, abscisic acid, and gibberellin in the hyponastic growth of submerged Rumex palustris petioles
    Plant Physiol: 2004 136:2948-2960
  69. Andersson-Gunneras S, Hellgren JM, Bjorklund S, Regan S, Moritz T, Sundberg B
    Asymmetric expression of a poplar ACC oxidase controls ethylene production during gravitational induction of tension wood
    Plant Journal: 2003 34:339-349
  70. Israelsson M, Eriksson ME, Hertzberg M, Aspeborg H, Nilsson P, Moritz T
    Changes in gene expression in the wood-forming tissue of transgenic hybrid aspen with increased secondary growth
    Plant Mol Biol: 2003 52:893-903
  71. King RW, Evans LT, Mander LN, Moritz T, Pharis RP, Twitchin B
    Synthesis of gibberellin GA(6) and its role in flowering of Lolium temulentum
    Phytochemistry: 2003 62:77-82
  72. Eriksson ME, Moritz T
    Daylength and spatial expression of a gibberellin 20-oxidase isolated from hybrid aspen (Populus tremula L. x P. tremuloides Michx.)
    Planta: 2002 214:920-930
  73. Welling A, Moritz T, Palva ET, Junttila O
    Independent activation of cold acclimation by low temperature and short photoperiod in hybrid aspen
    Plant Physiol: 2002 129:1633-1641
  74. Peng JR, Richards DE, Moritz T, Ezura H, Carol P, Harberd NP
    Molecular and physiological characterization of Arabidopsis GAI alleles obtained in targeted Ds-tagging experiments
    Planta: 2002 214:591-596
  75. Uggla C, Magel E, Moritz T, Sundberg B
    Function and dynamics of auxin and carbohydrates during earlywood/latewood transition in scots pine
    Plant Physiol: 2001 125:2029-2039
  76. Gocal GFW, Sheldon CC, Gubler F, Moritz T, Bagnall DJ, MacMillan CP, Li SF, Parish RW, Dennis ES, Weigel D, King RW
    GAMYB-like genes, flowering, and gibberellin signaling in Arabidopsis
    Plant Physiology: 2001 127:1682-1693
  77. King KE, Moritz T, Harberd NP
    Gibberellins are not required for normal stem growth in Arabidopsis thaliana in the absence of GAI and RGA
    Genetics: 2001 159:767-776
  78. King RW, Moritz T, Evans LT, Junttila O, Herlt AJ
    Long-day induction of flowering in Lolium temulentum involves sequential increases in specific gibberellins at the shoot apex
    Plant Physiol: 2001 127:624-632
  79. Astot C, Dolezal K, Nordstrom A, Wang Q, Kunkel T, Moritz T, Chua NH, Sandberg G
    An alternative cytokinin biosynthesis pathway
    Proc Natl Acad Sci U S A: 2000 97:14778-14783
  80. Astot C, Dolezal K, Moritz T, Sandberg G
    Deuterium in vivo labelling of cytokinins in Arabidopsis thaliana analysed by capillary liquid chromatography/frit-fast atom bombardment mass spectrometry
    J Mass Spectrom: 2000 35:13-22
  81. Eriksson ME, Israelsson M, Olsson O, Moritz T
    Increased gibberellin biosynthesis in transgenic trees promotes growth, biomass production and xylem fiber length
    Nature Biotechnology 2000 18:784-788
  82. Eklof S, Astot C, Sitbon F, Moritz T, Olsson O, Sandberg G
    Transgenic tobacco plants co-expressing Agrobacterium iaa and ipt genes have wild-type hormone levels but display both auxin- and cytokinin-overproducing phenotypes
    Plant Journal: 2000 23:279-284
  83. Valkonen JPT, Moritz T, Watanabe KN, Rokka VM
    Dwarf (di)haploid pito mutants obtained from a tetraploid potato cultivar (Solanum tuberosum subsp tuberosum) via anther culture are defective in gibberellin biosynthesis
    Plant Science: 1999 149:51-57
  84. Peng JR, Richards DE, Moritz T, Cano-Delgado A, Harberd NP
    Extragenic suppressors of the Arabidopsis gai mutation alter the dose-response relationship of diverse gibberellin responses
    Plant Physiology: 1999 119:1199-1207
  85. Fridborg I, Kuusk S, Moritz T, Sundberg E
    The Arabidopsis dwarf mutant shi exhibits reduced gibberellin responses conferred by overexpression of a new putative zinc finger protein
    Plant Cell: 1999 11:1019-1031
  86. Backlund A, Moritz T
    Phylogenetic implications of an expanded valepotriate distribution in the Valerianaceae
    Biochemical Systematics and Ecology: 1998 26:309-335
  87. Astot C, Dolezal K, Moritz T, Sandberg G
    Precolumn derivatization and capillary liquid chromatographic/ frit -fast atom bombardment mass spectrometric analysis of cytokinins in Arabidopsis thaliana
    J Mass Spectrom: 1998 33:892-902
  88. Moritz T, Schmulling T
    The gibberellin content of rolA transgenic tobacco plants is specifically altered
    Journal of Plant Physiology: 1998 153:774-776
  89. Wingsle G, Moritz T
    Analysis of ascorbate and dehydroascorbate in plant extracts by high-resolution selected ion monitoring gas chromatography mass spectrometry
    Journal of Chromatography A: 1997 782:95-103
  90. Eklof S, Astot C, Blackwell J, Moritz T, Olsson O, Sandberg G
    Auxin-cytokinin interactions in wild-type and transgenic tobacco
    Plant and Cell Physiology: 1997 38:225-235
  91. Olsen JE, Junttila O, Nilsen J, Eriksson ME, Martinussen I, Olsson O, Sandberg G, Moritz T
    Ectopic expression of oat phytochrome A in hybrid aspen changes critical daylength for growth and prevents cold acclimatization
    Plant Journal: 1997 12:1339-1350
  92. Eriksson ME, Moritz T
    Isolation of a cDNA Encoding a Phytochrome A (Accession No.AJ001318) from Populus tremula x tremuloides. (PGR97-186)
    Plant Physiology: 1997 115:1731-1731
  93. Olsen JE, Junttila O, Moritz T
    Long- day induced bud break in Salix pentandra is associated with transiently elevated levels of GA(1) and gradual increase in indole- 3- acetic acid
    Plant and Cell Physiology: 1997 38:536-540
  94. Uggla C, Moritz T, Sandberg G, Sundberg B
    Auxin as a positional signal in pattern formation in plants
    Proc Natl Acad Sci U S A: 1996 93:9282-9286
  95. Ashihara H, Monteiro AM, Moritz T, Gillies FM, Crozier A
    Catabolism of caffeine and related purine alkaloids in leaves of Coffea arabica L
    Planta: 1996 198:334-339
  96. Eklof S, Astot C, Moritz T, Blackwell J, Olsson O, Sandberg G
    Cytokinin metabolites and gradients in wild type and transgenic tobacco with moderate cytokinin over-production
    Physiologia Plantarum: 1996 98:333-344
  97. Moritz T, Sundberg B
    Endogenous cytokinins in the vascular cambial region of Pinus sylvestris during activity and dormancy
    Physiologia Plantarum: 1996 98:693-698
  98. Nilsson O, Moritz T, Sundberg B, Sandberg G, Olsson O
    Expression of the Agrobacterium rhizogenes rolC Gene in a Deciduous Forest Tree Alters Growth and Development and Leads to Stem Fasciation
    Plant Physiol: 1996 112:493-502
  99. Wang Q, Little CHA, Moritz T, Oden PC
    Identification of endogenous gibberellins, and metabolism of tritiated and deuterated GA(4), GA(9) and GA(20), in Scots pine (Pinus sylvestris) shoots
    Physiologia Plantarum: 1996 97:764-771
  100. PerezAmador MA, Carbonell J, Navarro JL, Moritz T, Beale MH, Lewis MJ, Hedden P
    N-4-hexanoylspermidine, a new polyamine-related compound that accumulates during ovary and petal senescence in pea
    Plant Physiology: 1996 110:1177-1186
 
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