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doi:10.1534/genetics.106.068858
A more recent version of this article appeared on April 1, 2007.
REGULAR RESEARCH PAPERS |
S locus F-box brothers: Multiple and pollen-specific F-box genes with S haplotype-specific polymorphisms in apple and Japanese pear
Hidenori Sassa 1*, Hiroyuki Kakui 1, Mayu Miyamoto 2, Yusuke Suzuki 2, Toshio Hanada 2, Koichiro Ushijima 3, Makoto Kusaba 4, Hisashi Hirano 2 and Takato Koba 1
1 Chiba University
2 Yokohama City University
3 Okayama University
4 University of Tokyo
* To whom correspondence should be addressed. E-mail: sassa{at}faculty.chiba-u.jp.
Submitted on November 24, 2006
Revised on January 2, 2007
Accepted on 16 January 2007
Although recent findings suggest that the F-box genes SFB/SLF control pollen-part S-specificity in the S-RNase-based gametophytic self-incompatibility (GSI) system, how these genes operate in the system is unknown, and functional variation of pollen S genes in different species has been reported. Here, we analyzed the S locus of two species of Maloideae: apple (Malus domestica) and Japanese pear (Pyrus pyrifolia). The sequencing of a 317 kb region of the apple S9 haplotype revealed two similar F-box genes. Homologous sequences were isolated from different haplotypes of apple and Japanese pear, and they were found to be polymorphic genes derived from the S locus. Since each S haplotype contains two or three related genes, the genes were named SFBB for S locus F-box brothers. The SFBB genes are specifically expressed in pollen, and variable regions of the SFBB genes are under positive selection. In a style-specific mutant S haplotype of Japanese pear, the SFBB genes are retained. Apart from their multiplicity, SFBB genes meet the expected characteristics of pollen S. The unique multiplicity of SFBB genes as the pollen S candidate is discussed in the context of mechanistic variation in the S-RNase-based GSI system.
Key Words: F-box, Rosaceae, S locus structure, pollen, self-incompatibility
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