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Research ArticleDevelopment and Growth Regulation
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Gibberellin Is Required for Flowering in Arabidopsis thaliana under Short Days

Ruth N. Wilson, John W. Heckman, Chris R. Somerville
Ruth N. Wilson
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John W. Heckman
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Chris R. Somerville
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Published September 1992. DOI: https://doi.org/10.1104/pp.100.1.403

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Abstract

Mutants of Arabidopsis thaliana deficient in gibberellin synthesis (ga1-3 and ga1-6), and a gibberellin-insensitive mutant (gai) were compared to the wild-type (WT) Landsberg erecta line for flowering time and leaf number when grown in either short days (SD) or continuous light (CL). The ga1-3 mutant, which is severely defective in ent-kaurene synthesis because it lacks most of the GA1 gene, never flowered in SD unless treated with exogenous gibberellin. After a prolonged period of vegetative growth, this mutant eventually underwent senescence without having produced flower buds. The gai mutant and the “leaky” ga1-6 mutant did flower in SD, but took somewhat longer than WT. All the mutants flowered readily in CL, although the ga1-3 mutant showed some delay. Unlike WT and ga1-3, the gai mutant failed to respond to gibberellin treatment by accelerating flowering in SD. A cold treatment promoted flowering in the WT and gai, but failed to induce flowering in ga1-3. From these results, it appears that gibberellin normally plays a role in initiating flowering of Arabidopsis.

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Gibberellin Is Required for Flowering in Arabidopsis thaliana under Short Days
Ruth N. Wilson, John W. Heckman, Chris R. Somerville
Plant Physiology Sep 1992, 100 (1) 403-408; DOI: 10.1104/pp.100.1.403

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Gibberellin Is Required for Flowering in Arabidopsis thaliana under Short Days
Ruth N. Wilson, John W. Heckman, Chris R. Somerville
Plant Physiology Sep 1992, 100 (1) 403-408; DOI: 10.1104/pp.100.1.403
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Plant Physiology
Vol. 100, Issue 1
September 1992
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More in this TOC Section

  • The rms1 Mutant of Pea Has Elevated Indole-3-Acetic Acid Levels and Reduced Root-Sap Zeatin Riboside Content but Increased Branching Controlled by Graft-Transmissible Signal(s)
  • Bacterial Cellulose-Binding Domain Modulates in Vitro Elongation of Different Plant Cells
  • Gibberellin Dose-Response Regulation of GA4 Gene Transcript Levels in Arabidopsis
Show more DEVELOPMENT AND GROWTH REGULATION

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