Contribution of gibberellin deactivation by AtGA2ox2 to the suppression of germination of dark-imbibed Arabidopsis thaliana seeds

被引：100

作者：

Yamauchi, Yukika ^{[1
]}

Takeda-Kamiya, Noriko ^{[1
]}

Hanada, Atsushi ^{[1
]}

Ogawa, Mikihiro ^{[1
]}

Kuwahara, Ayuko ^{[1
]}

Seo, Mitsunori ^{[1
]}

Kamiya, Yuji ^{[1
]}

Yamaguchi, Shinjiro ^{[1
]}

机构：

[1] RIKEN, Plant Sci Ctr, Tsurumi Ku, Yokohama, Kanagawa 2300045, Japan

来源：

PLANT AND CELL PHYSIOLOGY | 2007年 / 48卷 / 03期

关键词：

Arabidopsis thaliana; AtGA2ox2; gibberellin; 2-oxidase; phytochrome; seed germination;

D O I：

10.1093/pcp/pcm023

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

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 GA(4) levels and partly suppresses the germination inability during dark imbibition after inactivation of phytochrome. Experiments using 2,2-dimethyIGA(4), a GA(4) analog resistant to gibberellin 2-oxidase, in combination with ga2ox2 mutant seeds suggest that the efficiency of deactivation of exogenous GA(4) by AtGA2ox2 is dependent on light conditions, which partly explains phytochrome-mediated changes in gibberellin effectiveness (sensitivity) found in previous studies.

引用

页码：555 / 561

页数：7

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