The gibberellic acid biosynthesis mutantga1-3 ofArabidopsis thaliana is responsive to vernalization

✍ Scribed by Michaels, Scott D. ;Amasino, Richard M.

• Book ID: 101298012
• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 181 KB
• Volume: 25
• Category: Article
• ISSN: 0192-253X
• DOI: 10.1002/(sici)1520-6408(1999)25:3<194::aid-dvg2>3.0.co;2-2

✦ Synopsis

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 lateflowering, 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.