Physical mapping of DNA repetitive sequences to mitotic and meiotic chromosomes of Brassica oleracea var. alboglabra by fluorescence in situ hybridization

Article Abstract:

Three 18s-5.8S-25S rDNA sites have been confirmed in the haploid genome of Brassica oleracea var. alboglabra and their locations have been determined through fluorescence in situ hybridization. Two sites are located subtelomerically on the short arms of chromosomes 4 and 7, which are satellited acrocentric chromosomes. The third is on the short arm of chromosome 2, a large submetacentric chromosome, next to the centromere. Other details of the karyotype have also been determined.

Chromosome mapping, Plant cytogenetics

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Flowering plant self-incompatibility: the molecular population genetics of Brassica S-loci

Article Abstract:

Molecular genetic analyses of sequences involving polymorphism of self-incompatibility loci in different angiosperm families in comparison to other very polymorphic loci, especially MHC loci, can give information about the nature of polymorphism and its maintenance at self-incompatibility loci. Evidence for recombination at the Brassica self-incompatibility loci exists. It may be possible to find regions that are especially important in function in the recognition reaction.

Genetic polymorphisms, Plant population genetics, Plant molecular genetics

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Dominance relationships between S-alleles in self-incompatible Brassica campestris L

Article Abstract:

Relationships of dominance of S-alleles in self-incompatible Brassica campestris L., as studied for 249 of 276 possible pairs of 24 S-alleles isolated from two natural populations of Turkey and Japan are discussed. Interactions were different in the stigma and pollen and independent weakening of S-alleles was seen in 20 pairs in the pollen and two in the stigma with the interaction apparently correlated with recessiveness of S-alleles.

Japan, Turkey, Statistical Data Included, Allelomorphism, Alleles

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