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Determining the Physical Limits of the Brassica S Locus by Recombinational Analysis

Amy L. Casselman, Julia Vrebalov, Joann A. Conner, Anu Singhal, James Giovannoni, Mikhail E. Nasrallah and June B. Nasrallah
The Plant Cell
Vol. 12, No. 1 (Jan., 2000), pp. 23-33
DOI: 10.2307/3871027
Stable URL: http://www.jstor.org/stable/3871027
Page Count: 11
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Determining the Physical Limits of the Brassica S Locus by Recombinational Analysis
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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.

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