Journal Article

Long-Day Induced Bud Break in <i>Salix pentandra</i> Is Associated with Transiently Elevated Levels of GA<sub>1</sub> and Gradual Increase in Indole-3-Acetic Acid

Jorunn E. Olsen, Olavi Junttila and Thomas Moritz

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 38, issue 5, pages 536-540
Published in print January 1997 | ISSN: 0032-0781
Published online January 1997 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029202
Long-Day Induced Bud Break in Salix pentandra Is Associated with Transiently Elevated Levels of GA1 and Gradual Increase in Indole-3-Acetic Acid

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Initiation of dormancy in woody species is induced by a short photoperiod. In the early stages of dormancy development, growth can be initiated by long days. To study the possible involvement of gibberellins and indole-3-acetic acid in bud break in Salix pentandra, effects on levels of these plant hormones of transfer of seedlings in an early stage of dormancy to a growth-inductive long photoperiod was investigated. The bud break and initiation of growth correlated with a rapid transient increase in GA1 in defined zones of shoot tips to levels twice of that in continuously elongating long day-grown control seedlings, followed by a rapid decrease to levels similar to in these control plants. Also, the contents of GA53, GA19, GA20, GA8 increased upon transfer from short to long days. Levels of indole-3-acetic acid showed a gradual decline under short days, and increased gradually upon transfer to long days up to a level of continuously elongating plants. The present data suggest an interaction between gibberellin and indole-3-acetic acid in the photoperiodic control of dormancy development and bud break in S. pentandra.

Keywords: Bud break; Gibberellins; IAA; Indole-3-acetic acid; Photoperiod; Salix pentandra

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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