Journal Article

Contribution of Gibberellin Deactivation by AtGA2ox2 to the Suppression of Germination of Dark-Imbibed <i>Arabidopsis thaliana</i> Seeds

Yukika Yamauchi, Noriko Takeda-Kamiya, Atsushi Hanada, Mikihiro Ogawa, Ayuko Kuwahara, Mitsunori Seo, Yuji Kamiya and Shinjiro Yamaguchi

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 48, issue 3, pages 555-561
Published in print March 2007 | ISSN: 0032-0781
Published online March 2007 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcm023
Contribution of Gibberellin Deactivation by AtGA2ox2 to the Suppression of Germination of Dark-Imbibed Arabidopsis thaliana Seeds

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Gibberellin levels in imbibed Arabidopsis thaliana seeds are regulated by light via phytochrome, presumably through regulation of gibberellin biosynthesis genes, AtGA3ox1 and AtGA3ox2, and a deactivation gene, AtGA2ox2. Here, we show that a loss-of-function ga2ox2 mutation causes an increase in GA4 levels and partly suppresses the germination inability during dark imbibition after inactivation of phytochrome. Experiments using 2,2-dimethylGA4, a GA4 analog resistant to gibberellin 2-oxidase, in combination with ga2ox2 mutant seeds suggest that the efficiency of deactivation of exogenous GA4 by AtGA2ox2 is dependent on light conditions, which partly explains phytochrome-mediated changes in gibberellin effectiveness (sensitivity) found in previous studies.

Keywords: Arabidopsis thaliana; AtGA2ox2; Gibberellin; Gibberellin 2-oxidase; Phytochrome; Seed germination

Journal Article.  3282 words.  Illustrated.

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

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