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Plant Cell, Vol. 12, 23-34, January 2000, Copyright © 2000, American Society of Plant Physiologists
Determining the Physical Limits of the Brassica S Locus by Recombinational Analysis
Amy L. Casselmana,
Julia Vrebalovb,
Joann A. Connera,
Anu Singhala,
James Giovannonib,
Mikhail E. Nasrallaha, and
June B. Nasrallaha
a Department of Plant Biology, Cornell University, Ithaca, New York 14853-5908
b Crop Biotechnology Center, Texas A & M University, College Station, Texas 77843-2123
Correspondence to:
June B. Nasrallah, jbn2{at}cornell.edu (E-mail), 607-255-5407 (fax)
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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