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Phenotypic Suppression of the Gibberellin-Insensitive Mutant (gai) of Arabidopsis

R. N. Wilson, C. R. Somerville
R. N. Wilson
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C. R. Somerville
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Published June 1995. DOI: https://doi.org/10.1104/pp.108.2.495

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Abstract

The semidominant gibberellin-insensitive (gai) mutant of Arabidopsis thaliana shows impairment in multiple responses to the plant hormone gibberellin A3, which include effects on seed germination, stem elongation, apical dominance, and rapid flowering in short days. Results presented here show that the gai mutation also interferes with development of fertile flowers in continuous light. Mu-tagenesis of the gai mutant resulted in recovery of 17 independent mutants in which the gibberellin-insensitive phenotype is partially or completely suppressed. Sixteen of the suppressor mutations act semidominantly to restore gibberellin responsiveness. One representative of this class, the gar1 mutation, could not be genetically separated from the gai locus and is proposed to cause inactivation of the gai gene. The exceptional gar2 mutation partially suppresses the gai phenotype, is completely dominant, and is not linked to the gai locus. The gar2 mutation may define a new gene involved in gibberellin signaling. A recessive allele of the spindly (SPY) locus, spy-5, was also found to partially suppress the gai mutant phenotype.

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Phenotypic Suppression of the Gibberellin-Insensitive Mutant (gai) of Arabidopsis
R. N. Wilson, C. R. Somerville
Plant Physiology Jun 1995, 108 (2) 495-502; DOI: 10.1104/pp.108.2.495

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Phenotypic Suppression of the Gibberellin-Insensitive Mutant (gai) of Arabidopsis
R. N. Wilson, C. R. Somerville
Plant Physiology Jun 1995, 108 (2) 495-502; DOI: 10.1104/pp.108.2.495
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Plant Physiology
Vol. 108, Issue 2
Jun 1995
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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
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