The gibberellic acid biosynthesis mutant ga1-3 of Arabidopsis thaliana is responsive to vernalization.
The Arabidopsis mutant ga1-3 contains a deletion in an enzyme that catalyzes an early step in the synthesis of gibberellic acid. It has been shown that ga1-3 mutant plants cannot flower under 8-h short-day (SD) conditions, even after vernalization. In this article, we present data demonstrating that the ga1-3 mutation does not block the response to vernalization in intermediate photoperiods or in long-day conditions in a late-flowering, vernalization-responsive background. Thus, GA may not have a direct role in the vernalization response in Arabidopsis, but it may be required for an alternate pathway that promotes flowering in noninductive photoperiods.
Michaels
S D
SD
Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Amasino
R M
RM
D017360:Arabidopsis / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D003080:Cold Temperature; D005875:Gibberellins / Q000096:biosynthesis* / Q000235:genetics; D009154:Mutation; D017440:Photoperiod
D005875:Gibberellins; C007842:gibberellic acid