Evolutionary aspects of the S-related genes of the brassica self- incompatibility system: Synonymous and nonsynonymous base substitutions

K. Hinata, Masao Watanabe, S. Yamakawa, Y. Satta, A. Isogai

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

In the Brassicaceae, self- vs. nonself-recognition in self- incompatibility is controlled by sporophytic S-alleles. Haplotypes specifying both SRK (S-receptor kinase) and SLG (S-locus glycoprotein) are considered to play an important role in the recognition reactions. We compared the nucleotide sequences of SRK9(Bc) and SRK6(Bo). The number of nonsynonymous substitutions per site (P(n)) was lower, constrained, in the kinase than the receptor domain, while the numbers of synonymous substitutions (P(s)) in the two domains were largely comparable. Pairwise values for P(s) and P(n), were calculated among 17 operational taxonomic units, including eight SLGs, the receptor domains of two SRKs, four SRAs (S-related A) and three SRBs (S- related B), which have high homologies with each other. The values of P(s) and P(n) of SLG were mostly comparable to those of the receptor domain of SRK. Dendrograms constructed on the basis of P(n) and P(s) indicated that SRA differentiated first, followed hy SRB. The differentiation of SLG alleles is one of prerequisite factors for the establishment of self-incompatibility, and the allelic differentiation has occurred more than tens of million years ago.

Original languageEnglish
Pages (from-to)1099-1104
Number of pages6
JournalGenetics
Volume140
Issue number3
Publication statusPublished - 1995 Jul 3

ASJC Scopus subject areas

  • Genetics

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