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Plant Physiol, July 2001, Vol. 126, pp. 1174-1185

Altered Expression of SPINDLY Affects Gibberellin Response and Plant Development1

Stephen M. Swain,2* Tong-seung Tseng, and Neil E. Olszewski

Department of Plant Biology and Plant Molecular Genetics Institute, University of Minnesota, St. Paul, Minnesota 55108

Gibberellins (GAs) are plant hormones with diverse roles in plant growth and development. SPINDLY (SPY) is one of several genes identified in Arabidopsis that are involved in GA response and it is thought to encode an O-GlcNAc transferase. Genetic analysis suggests that SPY negatively regulates GA response. To test the hypothesis that SPY acts specifically as a negatively acting component of GA signal transduction, spy mutants and plants containing a 35S:SPY construct have been examined. A detailed investigation of the spy mutant phenotype suggests that SPY may play a role in plant development beyond its role in GA signaling. Consistent with this suggestion, the analysis of spy er plants suggests that the ERECTA (ER) gene, which has not been implicated as having a role in GA signaling, appears to enhance the non-GA spy mutant phenotypes. Arabidopsis plants containing a 35S:SPY construct possess reduced GA response at seed germination, but also possess phenotypes consistent with increased GA response, although not identical to spy mutants, during later vegetative and reproductive development. Based on these results, the hypothesis that SPY is specific for GA signaling is rejected. Instead, it is proposed that SPY is a negative regulator of GA response that has additional roles in plant development.

1 This work was supported by the National Science Foundation (grant no. MCB-9604126 to N.E.O.).

2 Present address: Commonwealth Scientific and Industrial Research Organization Plant Industry, Private Mail Bag, Merbein 3505, Victoria, Australia.

* Corresponding author; e-mail Steve.Swain{at}pi.csiro.au; fax 61-3-51513111.

© 2001 American Society of Plant Physiologists


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