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JXB Advance Access originally published online on November 26, 2007
Journal of Experimental Botany 2007 58(15-16):4047-4060; doi:10.1093/jxb/erm261
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© The Author [2007]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

Gene expression during the induction, maintenance, and release of dormancy in apical buds of poplar

Antje Rohde1,2 *, Tom Ruttink1,2 *, Vanessa Hostyn1,2, Lieven Sterck1,2, Klara Van Driessche1,2 and Wout Boerjan1,2,{dagger}

1Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), 9052 Gent, Belgium
2Department of Molecular Genetics, Ghent University, 9052 Gent, Belgium

{dagger} To whom correspondence should be addressed. E-mail: wout.boerjan{at}psb.ugent.be

The perennial lifestyle of trees is characterized by seasonal cycles of growth and dormancy. The recurrent transitions into and out of dormancy represent an adaptation mechanism that largely determines survival and, hence, the geographical distribution of tree species. To understand better the molecular basis of bud dormancy, cDNA-amplified fragment length polymorphism (AFLP) transcript profiling was used to map differential gene expression during dormancy induction, dormancy, dormancy release by chilling, and subsequent bud break in apical buds of poplar (Populus tremulaxP. alba). Unexpectedly, besides poplar transcript sequences, the cDNA-AFLP profiles revealed sequence signatures originating from a complex bacterial community, which was more pronounced during dormancy and displayed temporal dynamics in composition and complexity. Based on poplar gene expression dynamics, processes and potential regulators during different phases of dormancy are described. Novel genes were linked to a crucial transitory step in dormancy induction, and to dormancy release through chilling, a molecularly unresolved phenomenon. One WRKY- and two ERF-related transcription factors were similarly expressed during the transition to dormancy in apical and axillary buds. These regulatory genes could be involved in the differentiation of stipule-like leaf organs protecting the bud, or act during the growth–dormancy transition in the meristem, revealing commonalities between para- and endodormancy.

Key words: cDNA-AFLP, dormancy, gene expression, poplar

* Present address: Institute for Agricultural and Fisheries Research, 9090 Melle, Belgium

Received 6 June 2007; Revised 27 September 2007 Accepted 28 September 2007


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[Abstract] [Full Text] [PDF]


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