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Theobroxide inhibits stem elongation in Pharbitis nil by regulating jasmonic acid and gibberellin biosynthesis

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Title: Theobroxide inhibits stem elongation in Pharbitis nil by regulating jasmonic acid and gibberellin biosynthesis
Authors: Kong, Fanjiang Browse this author
Gao, Xiquan Browse this author
Nam, Kyong-Hee Browse this author
Takahashi, Kosaku Browse this author →KAKEN DB
Matsuura, Hideyuki Browse this author
Yoshihara, Teruhiko Browse this author
Keywords: Theobroxide
Jasmonic acid
Gibberellin
Stem elongation
Lipoxygenase
Pharbitis nil
Issue Date: Oct-2005
Publisher: Elsevier
Journal Title: Plant Science
Volume: 169
Issue: 4
Start Page: 721
End Page: 725
Publisher DOI: 10.1016/j.plantsci.2005.05.023
Abstract: In this study, exogenous factors affecting the elongation growth in the short day plant, Pharbitis nil, was investigated. Theobroxide inhibited stem elongation in Pharbitis nil both under short day (SD) and long day (LD) conditions. Salicylhydroxamic acid (SHAM), an inhibitor of jasmonic acid (JA) biosynthesis, and GA3 recovered the inhibitory effect of theobroxide on stem elongation. Quantitative analysis of JA showed that the level of endogenous JA increased significantly in theobroxide treated plants, while exogenously applied GA3 and SHAM suppressed JA biosynthesis stimulated by theobroxide. The activity of lipoxygenase (LOX, the key enzyme of JA biosynthesis) also was stimulated by theobroxide and this stimulation was nullified by SHAM and GA3. Quantitative analysis of GA1 showed that theobroxide suppressed GA1 biosynthesis. In non theobroxide treated Pharbitis nil, SD conditions stimulated JA biosynthesis and LOX activity, while GA1 biosynthesis was suppressed. All these results suggest that JA probably is involved negatively in the control of stem elongation, and the balance between JA and gibberellin might determine the stem growth in Pharbitis nil.
Rights: Copyright © 2006 Elsevier B.V. All rights reserved.
Relation: http://www.sciencedirect.com/science/journal/01689452
Type: article (author version)
URI: http://hdl.handle.net/2115/8515
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Fanjiang Kong

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