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Plant Cell, Vol. 10, 1453-1464, September 1998, Copyright © 1998, American Society of Plant Physiologists

Temperature-Sensitive Splicing in the Floral Homeotic Mutant apetala3-1

Robert W. M. Sablowskia and Elliot M. Meyerowitza
a Division of Biology 156-29, California Institute of Technology, Pasadena, California 91125

Correspondence to: Elliot M. Meyerowitz, meyerow{at}cco.caltech.edu (E-mail), 626-449-0756 (fax).

The floral homeotic gene APETALA3 (AP3) is required for stamen and petal development in Arabidopsis. The previously described ap3-1 allele is temperature sensitive and carries a missense mutation near a 5' splice site. The missense mutation lies within a domain of the AP3 protein that is thought to be important for protein–protein interactions, which suggests that temperature sensitivity of ap3-1 could reflect an unstable interaction with cofactors. Here, we show instead that the ap3-1 mutation causes a temperature-dependent splicing defect and that temperature sensitivity is not a property of the protein products of ap3-1 but of RNA processing, possibly because of unstable base pairing between the transcript and small nuclear RNAs. The unexpected defect of the ap3-1 mutant offers unique opportunities for genetic and molecular studies of splice site recognition in plants.




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