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Plant Cell. 2000 Jan;12(1):23-33.

Determining the physical limits of the Brassica S locus by recombinational analysis.

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  • 1Department of Plant Biology, Cornell University, Ithaca, New York 14853-5908, USA.

Abstract

A genetic analysis was performed to study the frequency of recombination for intervals across the Brassica S locus region. No recombination was observed between the S locus glycoprotein gene and the S receptor kinase gene in the segregating populations that we analyzed. However, a number of recombination breakpoints in regions flanking these genes were identified, allowing the construction of an integrated genetic and physical map of the genomic region encompassing one S haplotype. We identified, based on the pollination phenotype of plants homozygous for recombinant S haplotypes, a 50-kb region that encompasses all specificity functions in the S haplotype that we analyzed. Mechanisms that might operate to preserve the tight linkage of self-incompatibility specificity genes within the S locus complex are discussed in light of the relatively uniform recombination frequencies that we observed across the S locus region and of the structural heteromorphisms that characterize different S haplotypes.

PMID:
10634905
[PubMed - indexed for MEDLINE]
PMCID:
PMC140212
Free PMC Article

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