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THE PLANT CELL, Vol 1, Issue 2 249-258, Copyright © 1989 by American Society of Plant Biologists
A Highly Conserved Brassica Gene with Homology to the S-Locus-Specific Glycoprotein Structural Gene
B. A. Lalonde, M. E. Nasrallah, K. G. Dwyer, C. H. Chen, B. Barlow and J. B. Nasrallah
Section of Plant Biology, Cornell University, Ithaca, New York 14853
The S-locus-specific glycoprotein of Brassica and the gene encoding it (the
SLG gene) are thought to be involved in determining self-incompatibility
phenotype in this genus. It has been shown that the Brassica genome
contains multiple SLG-related sequences. We report here the cloning and
characterization of a Brassica oleracea gene, SLR1, which corresponds to
one of these SLG-related sequences. Like the SLG gene, SLR1 is
developmentally regulated. It is maximally expressed in the papillar cells
of the stigma at the same stage of flower development as the onset of the
incompatibility response. Unlike SLG, the SLR1 genes isolated from
different S-allele homozygotes are highly conserved, and this gene, which
appears to be ubiquitous in crucifers, is expressed in self-compatible
strains as well as self-incompatible strains. Most importantly, we show
that the SLR1 gene is not linked to the S-locus and therefore cannot be a
determinant of S-allele specificity in Brassica.
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