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Genomic organization of the S locus: Identification and characterization of genes in SLG/SRK region of S(9) haplotype of Brassica campestris (syn. rapa).

Authors :
Suzuki G
Kai N
Hirose T
Fukui K
Nishio T
Takayama S
Isogai A
Watanabe M
Hinata K
Source :
Genetics [Genetics] 1999 Sep; Vol. 153 (1), pp. 391-400.
Publication Year :
1999

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 S(9) haplotype of Brassica campestris (syn. rapa) and identified 10 genes in addition to the four previously identified (SLG(9), SRK(9), 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 SLG(9). 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.

Details

Language :
English
ISSN :
0016-6731
Volume :
153
Issue :
1
Database :
MEDLINE
Journal :
Genetics
Publication Type :
Academic Journal
Accession number :
10471721
Full Text :
https://doi.org/10.1093/genetics/153.1.391