Genomic organization of the S locus: Identification and characterization of genes in SLG/SRK region of S9 haplotype of Brassica campestris (syn. rapa)

Go Suzuki, Naoko Kai, Tamaki Hirose, Kiichi Fukui, Takeshi Nishio, Seiji Takayama, Akira Isogai, Masao Watanabe, Kokichi Hinata

Research output: Contribution to journalArticlepeer-review

232 Citations (Scopus)

Abstract

In Brassica, two self-incompatibility genes, encoding SLG (S locus glycoprotein) and SRK (S-receptor kinase), are located at the S locus and expressed in the stigma. Recent molecular analysis has revealed that the S locus is highly polymorphic and contains several genes, i.e., SLG, SRK, the as-yet-unidentified pollen S gene(s), and other linked genes. In the present study, we searched for expressed sequences in a 76-kb SLG/SRK region of the S9 haplotype of Brassica campestris (syn. rapa) and identified 10 genes in addition to the four previously identified (SLG9, SRK9, SAE1, and SLL2) in this haplotype. This gene density (1 gene/5.4 kb) suggests that the S locus is embedded in a gene-rich region of the genome. The average G + C content in this region is 32.6%. An En/Spm-type transposon-like element was found downstream of SLG9. Among the genes we identified that had not previously been found to be linked to the S locus were genes encoding a small cysteine- rich protein, a J-domain protein, and an antisilencing protein (ASF1) homologue. The small cysteine-rich protein was similar to a pollen coat protein, named PCP-A1, which had previously been shown to bind SLG.

Original languageEnglish
Pages (from-to)391-400
Number of pages10
JournalGenetics
Volume153
Issue number1
Publication statusPublished - 1999 Sep 1

ASJC Scopus subject areas

  • Genetics

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