A high degree of homology exists between the protein encoded by SLG and the S receptor domain encoded by SRK in self-incompatible brassica campestris l.

Masao Watanabe, Takeshi Takasaki, Kinya Toriyama, Seiyei Yamakawa, Akira Isogai, Akinori Suzuki, Kokichi Hinata

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

The sporophytic self-incompatibility system in Brassica campestris is controlled by multiple alleles of a single locus, S. We isolated and characterized cDNA clones that correspond to genes for S-glycoprotein (SLG) and S-receptor kinase (SRK) from an S9-homozygous strain. An SRK9 fragment was amplified by the polymerase chain reaction (PCR) by use of primers that corresponded to regions of the gene for the extracellular receptor domain (S-domain) and the kinase domain. The fragment was used as a probe to isolate an SRK9 cDNA clone from the cDNA library of stigmas of an S9-homozygote. An SLG9 cDNA clone was also isolated from the library by use of SLG8 cDNA as a probe. Restriction fragment length polymorphism (RFLP) linkage analysis of the F2 plants from an S8S9 hybrid demonstrated that the SRK and SLG genes were tightly linked to one another and were also linked to S-genotypes, as determined by pollination tests. The transcripts of SRK9 and SLG9 were detected in stigmas, but not in anthers or leaves. The cytoplasmic kinase domain encoded by SRK9 contained amino acid sequences that are conserved in serine/threonine kinases. The nucleotide sequence encoding the S-domain of SRK9 was 98.4% homologous to that of SLG9 at the nucleotide level. This observation suggests the existence of a mechanism for maintaining a high degree of similarity between SLG and the region that encodes the S-domain of SRK.

Original languageEnglish
Pages (from-to)1221-1229
Number of pages9
JournalPlant and Cell Physiology
Volume35
Issue number8
DOIs
Publication statusPublished - 1994 Jan 1

Keywords

  • Brassica campestris L.
  • S-glycoprotein
  • S-receptor kinase
  • Self-incompatibility

ASJC Scopus subject areas

  • Physiology
  • Plant Science
  • Cell Biology

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