Two anther-expressed genes downstream of SLG9: Identification of a novel S-linked gene specifically expressed in anthers at the uninucleate stage of Brassica campestris (syn. rapa) L.

Masao Watanabe, Go Suzuki, Kinya Toriyama, Seiji Takayama, Akira Isogai, Kokichi Hinata

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The sporophytic self-incompatibility (SI) system in Brassica campestris (syn. rapa) is controlled by multiple alleles of a single locus, S, in which SLG and SRK are located. SLG and/or SRK appear to comprise the female component of the recognition reaction of SI. The gene encoding the male component must also be located at the S locus but has not been identified to date. RNA gel blot analysis with regions flanking SLG9 and SRK9 revealed two anther-expressed genes 3' of the SLG9 gene. Two cDNA clones were isolated using the 3'-flanking region of SLG9 as probe. Because of sequence similarity with the Brassica SLL2 gene, one cDNA clone was designated SLL2-S9 (for S Locus-Linked 2-S9 gene). The 5'-region of SLL2-S9 was not present in other SLL2 genes examined. The second gene was novel and was designated SAE1-S9 (for S locus Anther Expressed 1-S9 gene). SAE1-S9 and SLL2-S9 were located approximately 2.5 kb and 5.5 kb, respectively, downstream of SLG9. A 1.4-kb transcript for SLL2-S9 was detected in both vegetative and reproductive tissues, whereas 1.9-kb and 2.4-kb transcripts were specifically detected in the anther of S9 haplotype. SAE1-S9 was specifically expressed in the anther at the uninucleate stage. This gene encoded a novel polypeptide of 257 amino acids. Database analysis revealed a homologous sequence in the upstream region of SRK3 of B. oleracea. We discuss possible relationships between SLL2-S9 and SAE1-S9 and SI.

Original languageEnglish
Pages (from-to)127-134
Number of pages8
JournalSexual Plant Reproduction
Volume12
Issue number3
DOIs
Publication statusPublished - 1999 Jan 1

Keywords

  • Anther-expressed gene
  • Brassica campestris (syn, rapa) L.
  • S locus
  • SLG
  • Self-incompatibility

ASJC Scopus subject areas

  • Plant Science
  • Cell Biology

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