Contribution of Gibberellin Deactivation by AtGA2ox2 to the Suppression of Germination of Dark-Imbibed Arabidopsis thaliana Seeds
| Autor: | Atsushi Hanada, Yuji Kamiya, Mikihiro Ogawa, Shinjiro Yamaguchi, Mitsunori Seo, Yukika Yamauchi, Noriko Takeda-Kamiya, Ayuko Kuwahara |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Physiology
Mutant Arabidopsis Germination Plant Science Genes Plant Mixed Function Oxygenases Botany Arabidopsis thaliana biology Phytochrome Chemistry food and beverages Cell Biology General Medicine Darkness biology.organism_classification Gibberellins Cell biology Phenotype Mutation Gibberellin Imbibition |
| Zdroj: | Plant and Cell Physiology. 48:555-561 |
| ISSN: | 1471-9053 0032-0781 |
| Popis: | 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-dimethylGA(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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|