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THE PLANT CELL, Vol 5, Issue 8 887-896, Copyright © 1993 by American Society of Plant Biologists
Mutations at the SPINDLY Locus of Arabidopsis Alter Gibberellin Signal Transduction
S. E. Jacobsen and N. E. Olszewski
Department of Plant Biology and Plant Molecular Genetics Institute, University of Minnesota, St. Paul, Minnesota 55108
Three independent recessive mutations at the SPINDLY (SPY) locus of
Arabidopsis confer resistance to the gibberellin (GA) biosynthesis
inhibitor paclobutrazol. Relative to wild type, spy mutants exhibit longer
hypocotyls, leaves that are a lighter green color, increased stem
elongation, early flowering, parthenocarpy, and partial male sterility. All
of these phenotypes are also observed when wild-type Arabidopsis plants are
repeatedly treated with gibberellin A3 (GA3). The spy-1 allele is partially
epistatic to the ga1-2 mutation, which causes GA deficiency. In addition,
the spy-1 mutation can simultaneously suppress the effects of the ga1-2
mutation and paclobutrazol treatment, which inhibit different steps in the
GA biosynthesis pathway. This observation suggests that spy-1 activates a
basal level of GA signal transduction that is independent of GA.
Furthermore, results from GA3 dose-response experiments suggest that GA3
and spy-1 interact in an additive manner. These results are consistent with
models in which the SPY gene product regulates a portion of the GA signal
transduction pathway.
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