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The Plant Cell, Vol. 14, 2215-2232, September 2002, Copyright © 2002,
American Society of Plant Biologists

Mitochondrial GFA2 Is Required for Synergid Cell Death in Arabidopsis

Cory A. Christensen1, Steven W. Gorsich, Ryan H. Brown2, Linda G. Jones, Jessica Brown2, Janet M. Shaw and Gary N. Drews3

Department of Biology, University of Utah, Salt Lake City, Utah 84112-0840

3 To whom correspondence should be addressed. E-mail drews{at}biosci.biology.utah.edu; fax 801-581-4668

Little is known about the molecular processes that govern female gametophyte (FG) development and function, and few FG-expressed genes have been identified. We report the identification and phenotypic analysis of 31 new FG mutants in Arabidopsis. These mutants have defects throughout development, indicating that FG-expressed genes govern essentially every step of FG development. To identify genes involved in cell death during FG development, we analyzed this mutant collection for lines with cell death defects. From this analysis, we identified one mutant, gfa2, with a defect in synergid cell death. Additionally, the gfa2 mutant has a defect in fusion of the polar nuclei. We isolated the GFA2 gene and show that it encodes a J-domain–containing protein. Of the J-domain–containing proteins in Saccharomyces cerevisiae (budding yeast), GFA2 is most similar to Mdj1p, which functions as a chaperone in the mitochondrial matrix. GFA2 is targeted to mitochondria in Arabidopsis and partially complements a yeast mdj1 mutant, suggesting that GFA2 is the Arabidopsis ortholog of yeast Mdj1p. These data suggest a role for mitochondria in cell death in plants.




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