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| Gibberellins promote flowering of Arabidopsis by activating the LEAFY promoter |
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| Author(s): Blazquez MA, Green R, Nilsson O, Sussman MR, Weigel D |
| Source: PLANT CELL Volume: 10 Issue: 5 Pages: 791-800 Published: MAY 1998 |
| Times Cited: 168 References: 38 |
| Abstract: The gibberellin class of plant hormones has been implicated in the control of flowering in several species. In Arabidopsis, severe reduction of endogenous gibberellins delays flowering in long days and prevents flowering in short days. We have investigated how the differential effects of gibberellins on flowering correlate with expression of LEAR: a floral meristem identity gene. We have found that the failure of gibberellin-deficient ga1-3 mutants to flower in short days was paralleled by the absence of LEAN promoter induction. A causal connection between these two events was confirmed by the ability of a constitutively expressed LEAN transgene to restore flowering to ga1-3 mutants in short days. In contrast to short days, impairment of gibberellin biosynthesis caused merely a reduction of LEAN expression when plants were grown in long days or with sucrose in the dark. As a first step toward identifying other small molecules that might regulate flowering, we have developed a rapid in vitro assay for LEAFY promoter activity. |
| Document Type: Article |
| Language: English |
| Reprint Address: Weigel, D (reprint author), Salk Inst Biol Studies, Plant Biol Lab, 10010 N Torrey Pines Rd, La Jolla, CA 92037 USA |
Addresses:
1. Salk Inst Biol Studies, Plant Biol Lab, La Jolla, CA 92037 USA
2. Univ Wisconsin, Ctr Environm Toxicol, Madison, WI 53706 USA
3. Univ Wisconsin, Ctr Biotechnol, Madison, WI 53706 USA |
| Publisher: AMER SOC PLANT PHYSIOLOGISTS, 15501 MONONA DRIVE, ROCKVILLE, MD 20855 USA |
| Subject Category: Biochemistry & Molecular Biology; Plant Sciences; Cell Biology |
| IDS Number: ZQ239 |
| ISSN: 1040-4651 |
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