First published online April 29, 2002; 10.1105/tpc.010477
The Plant Cell, Vol. 14, 1161-1172,
May 2002, Copyright © 2002,
American Society of Plant Biologists
The Cell Wall Hydroxyproline-Rich Glycoprotein RSH Is Essential for Normal Embryo Development in Arabidopsis
Qi Hall1 and
Maura C. Cannon2
Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst, Massachusetts 01003-4505
2 To whom correspondence should be addressed. E-mail mcannon{at}bio.umass.edu; fax 413-545-3291
Although a large number of embryo mutants have been studied, mostly at the morphological level, the critical molecular and cellular events responsible for embryogenesis are unknown. Here, we report that using an enhancer-trap embryo mutant of Arabidopsis, we identified a gene, ROOT-SHOOT-HYPOCOTYLDEFECTIVE (RSH), that is essential for the correct positioning of the cell plate during cytokinesis in cells of the developing embryo. We traced the earliest point of influence of RSH to the first asymmetrical division of the zygote. Homozygous rsh embryos were defective morphologically, had irregular cell shape and size, and germinated to form agravitropic-defective seedlings incapable of further development. The RSH gene encodes a Hyp-rich glycoproteintype cell wall protein. RSH localized to the cell wall throughout the embryo and to a few well-defined postembryonic sites. Although several lines of evidence from previous work suggest that the cell wall is involved in development, the protein(s) involved remained elusive.
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