Comparative analysis of S haplotypes with very similar SLG alleles in Brassica rapa and Brassica oleracea

Makoto Kusaba, Takeshi Nishio

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34 Citations (Scopus)


Self-incompatibility in Brassica is controlled by a single multi-allelic locus (the S locus) which harbors at least two highly polymorphic genes, SLG and SRK. SRK is a putative transmembrane receptor kinase and its amino acid sequence of the extracellular domain of SRK (the S domain) exhibits high homology to that of SLG. The amino acid sequences of the SLGs of S8 and S46 haplotypes of B. rapa are very similar and those of S23 and S29 haplotypes of B. oleracea were also found to be almost identical. In both cases, SLG and the S domain of SRK of the same haplotype were loss similar. This seems to contradict the idea that SLG and SRK of the same haplotype have the same self-recognition specificity. In the transmembrane-kinase domain, the SRK alleles of the S8 and S46 haplotypes had almost identical nucleotide sequences in spite of their lower homology in the S domain. Such a cluster of nucleotide substitutions is probably due to recombination or related events, although recombination in the S locus is thought to be suppressed. Based on our observations, the recognition mechanism and the evolution of self-incompatibility in Brassica are discussed.

Original languageEnglish
Pages (from-to)83-91
Number of pages9
JournalPlant Journal
Issue number1
Publication statusPublished - 1999 Jan
Externally publishedYes

ASJC Scopus subject areas

  • Genetics
  • Plant Science
  • Cell Biology


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