Journal
PLANT AND CELL PHYSIOLOGY
Volume 48, Issue 3, Pages 555-561Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcm023
Keywords
Arabidopsis thaliana; AtGA2ox2; gibberellin; gibberellin 2-oxidase; phytochrome; seed germination
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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 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.
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