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United States Department of Agriculture

Agricultural Research Service

Research Project: CHARACTERIZATION OF STRESS RESISTANCE GENES AND MECHANISMS, & IMPROVEMENT AND GENOTYPING OF WHEAT AND BARLEY GERMPLASM FOR THE WESTERN U.S.

Location: Wheat Genetics, Quality Physiology and Disease Research

Title: Mutations in the F-box gene SNEEZY result in decreased arabidopsis GA signaling

Authors
item Ariizumi, Tohru -
item Steber, Camille

Submitted to: Plant Signaling and Behavior
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: February 15, 2011
Publication Date: June 20, 2011
Citation: Ariizumi, T., Steber, C.M. 2011. Mutations in the F-box gene SNEEZY result in decreased arabidopsis GA signaling. Plant Signaling and Behavior. 6(6):831-833.

Interpretive Summary: This report shows that mutations in the F-box gene SNEEZY result in reduced reponse to the plant hormone GA. This results in a slight decrease in ability to germinate and, in a SLEEPY1 mutant background, a decrease in plant height and fertility. We also suggest that SNEEZY may have unique functions in controlling branching pattern.

Technical Abstract: We previously reported that the SLEEPY1 (SLY1) homolog, F-box gene SNEEZY/SLEEPY2 (SNE/SLY2), can partly replace SLY1 in gibberellin (GA) hormone signaling through interaction with DELLAs RGA and GAI. To determine whether SNE normally functions in GA signaling, we characterized the phenotypes of two T-DNA alleles, sne-t2 and sne-t3. These mutations result in no apparent vegetative phenotypes, but do result in increased ABA sensitivity in seed germination. Double mutants sly1-t2 sne-t2 and sly1-t2 sne-t3 result in a significant decrease in plant fertility and final plant height compared to sly1-t2. The fact that sne mutations have an additive effect with sly1 suggests that SNE normally functions as a redundant positive regulator of GA signaling.

Last Modified: 4/18/2014