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

研究成果: Article査読

50 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1099-1104
ページ数6
ジャーナルGenetics
140
3
出版ステータスPublished - 1995 7 3

ASJC Scopus subject areas

  • 遺伝学

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