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New insights into growth cessation and dormancy in trees

Resman, Lars (2010). New insights into growth cessation and dormancy in trees. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2010:36
ISBN 978-91-576-7449-4
[Doctoral thesis]

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Since trees are sessile they have evolved elaborate mechanisms that anticipate oncoming winter and allow the trees to withstand extreme changes in their environment. Trees need to stop growth and initiate cold hardiness well before cold temperatures become damaging, consequently the timings of growth cessation and dormancy are important adaptive traits for their ability to survive in harsh winter conditions. If the trees fail to anticipate the onset of winter they will suffer severe damage, whereas early growth cessation will reduce the growing season and their productivity, thereby causing loss of fitness. Thus, the optimal timing of growth cessation is the point at which these risks are balanced. Hence, plants from different latitudes have different critical daylengths, and cease growth at different times. In the work this thesis is based upon, my colleagues and I examined changes in the transcription of genes involved in various processes that are co-induced by shorter than critical daylengths, e.g. cold hardiness and the production of storage proteins. In addition, we showed that differences in growth cessation timing in trees also depends on other factors acting downstream of daylength sensing. Abscisic acid (ABA) is a plant hormone that is known to play an important role in seed dormancy and also has proposed involvement in bud dormancy. It is known that ABA levels increase after growth cessation, concurrently with the establishment of dormancy, suggesting that it may play a role in dormancy induction. To further investigate this possibility we constructed trees with reduced sensitivity to ABA. These trees were unable to enter dormancy. In summary, this thesis describes molecular-level investigations of growth cessation and the transition to dormancy, in which microarrays, real-time polymerase chain reaction assays and transgenic hybrid aspen were used. Through better understanding of how trees perceive light signals and subsequent events, in the future it may be possible to engineer trees with altered activity-dormancy transition traits to improve their productivity.

Authors/Creators:Resman, Lars
Title:New insights into growth cessation and dormancy in trees
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2010
Number of Pages:59
ALLI Druart, N., Johansson, A., Baba, K., Schrader, J., Sjödin, A., Bhalerao, Rupali R., Resman, L., Trygg, J., Moritz, T., Bhalerao, R. Environmental and hormonal regulation of the activity-dormancy cycle in the cambial meristem involves stage-specific modulation of transriptional and metabolic networks. The Plant Journal 2007 50: 557-573 II Lars Resman, Glenn Howe, David Jonsen, Madeleine Englund, Nathalie Druart, Jarmo Schrader, Henrik Antii, Jeff Skinner, Tony Chen and Rishikesh P. Bhalerao. Components acting downstream of SD perception regulate differential cessation of cambial activity in early and late clones of hybrid poplar. Submitted Plant Physiology III Anna Petterle, Lars Resman, Bhalerao R.P. Hybrid aspen with reduced sensitivity to ABA display impaired bud dormancy. (manucsript)
Place of Publication:Umeå
ISBN for printed version:978-91-576-7449-4
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:populus, dormancy, buds, growth, aba
Keywords:Populus, dormancy, abscisic acid, bud
Permanent URL:
ID Code:2352
Department:(S) > Dept. of Forest Genetics and Plant Physiology
Deposited By: Lars Resman
Deposited On:20 Sep 2010 00:00
Metadata Last Modified:02 Dec 2014 10:17

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