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Molecular analysis of factors regulating wood formation and seasonal growth cycles in hybrid aspen

Karlberg, Anna (2011). Molecular analysis of factors regulating wood formation and seasonal growth cycles in hybrid aspen. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2011:24
ISBN 978-91-576-7559-0
[Doctoral thesis]

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Abstract

Of all of the organisms on the planet, trees are perhaps the ultimate survivors. Their unique growth characteristics allow them to become both the largest and the oldest organisms on Earth. Their size can be attributed to their secondary growth (wood formation), which results in the formation of their massive trunks, while their ability to survive and continue growing for several hundred years depends on their ability to modulate their growth according to the surrounding environment. This thesis explores wood formation and seasonal growth cycles on a molecular level. These tree-specific processes were studied separately, but several common factors that influence both of them were identified. One of these is the control of the core cell cycle machinery. The cell cycle machinery is subject to significant transcriptional regulation during the seasonal growth cycle; it was found that this transcriptional regulation primarily affects plant cyclins. A transcription factor of the AP2 family, AINTEGUMENTALIKE1 (AIL1), was shown to play a significant role in short-day- induced growth cessation, possibly by regulating the expression of the D-type cyclins, which are core regulators in the plant cell cycle. AIL1 is also involved in cambial growth; its misexpression causes severe developmental effects in the stem tissues. This thesis also provides new insights into the influence of the plant hormone auxin on tree growth and development. The known loss of auxin responsiveness during winter was shown to be a gradual process controlled by the intricate auxin signaling network. The same network was also studied during normal growth and shown to have a major influence on cambial activity and maintenance as well as wood development.

Authors/Creators:Karlberg, Anna
Title:Molecular analysis of factors regulating wood formation and seasonal growth cycles in hybrid aspen
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2011
Volume:2011:24
Number of Pages:70
Papers/manuscripts:
NumberReferences
I.Karlberg A*, Englund M*, Petterle A, Molnar G, Sjödin A, Bako L and Bhalerao RP. (2010) Analysis of global changes in gene expression during activity-dormancy cycle in hybrid aspen apex. Plant Biotechnology 27(1), 1-16
II.Karlberg A, Bako L and Bhalerao RP. AINTEGUMENTALIKE1 is the target of short day signal in the regulation of growth cessation response in hybrid aspen. (Manuscript)
III.Baba K*, Karlberg A*, Schmidt J, Schrader J, Hvidsten TR, Bako L and Bhalerao RP. (2011) Activity-dormancy transition in the cambial meristem involves stage-specific modulation of auxin response in hybrid aspen. Proceedings of the National Academy of Sciences of the United States of America 108 (8), 3418-3423
IV.Nilsson J*, Karlberg A*, Antti H, Lopez-Vernaza M, Mellerowicz E, Perrot-Rechenmann C, Sandberg G and Bhalerao RP. (2008) Dissecting the molecular basis of the regulation of wood formation by auxin in hybrid aspen. Plant Cell 20, 843-855
Place of Publication:Umeå
Publisher:Dept. of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-7559-0
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 404 Agricultural Biotechnology > Genetics and Breeding
Agrovoc terms:lignification, growth, periodicity, dormancy, meristems, cell cycle, auxins, populus, hybrids
Keywords:meristem, growth cessation, dormancy, cell cycle, wood, auxin, short day, hybrid aspen
URN:NBN:urn:nbn:se:slu:epsilon-e-5
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-5
ID Code:2463
Department:(S) > Dept. of Forest Genetics and Plant Physiology
Deposited By: Anna Karlberg
Deposited On:25 Mar 2011 00:00
Metadata Last Modified:02 Dec 2014 10:18

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