First published online February 21, 2003; 10.1105/tpc.009290
The Plant Cell, Vol. 15, 771-781,
March 2003, Copyright © 2003,
American Society of Plant Biologists
Structural and Transcriptional Analysis of the Self-Incompatibility Locus of Almond: Identification of a Pollen-Expressed F-Box Gene with Haplotype-Specific Polymorphism
Koichiro Ushijima1,a,
Hidenori Sassa1,2,b,
Abhaya M. Dandekarc,
Thomas M. Gradzielc,
Ryutaro Taoa and
Hisashi Hiranob
a Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
b Kihara Institute for Biological Research and Graduate School of Integrated Science, Yokohama City University, Yokohama 244-0813, Japan
c Department of Pomology, University of California, Davis, California 95616
2 To whom correspondence should be addressed. E-mail sassa{at}yokohama-cu.ac.jp; fax 81-45-820-1901
Gametophytic self-incompatibility in Rosaceae, Solanaceae, and Scrophulariaceae is controlled by the S locus, which consists of an S-RNase gene and an unidentified "pollen S" gene. An 70-kb segment of the S locus of the rosaceous species almond, the S haplotypespecific region containing the S-RNase gene, was sequenced completely. This region was found to contain two pollen-expressed F-box genes that are likely candidates for pollen S genes. One of them, named SFB (S haplotypespecific F-box protein), was expressed specifically in pollen and showed a high level of S haplotypespecific sequence polymorphism, comparable to that of the S-RNases. The other is unlikely to determine the S specificity of pollen because it showed little allelic sequence polymorphism and was expressed also in pistil. Three other S haplotypes were cloned, and the pollen-expressed genes were physically mapped. In all four cases, SFBs were linked physically to the S-RNase genes and were located at the S haplotypespecific region, where recombination is believed to be suppressed, suggesting that the two genes are inherited as a unit. These features are consistent with the hypothesis that SFB is the pollen S gene. This hypothesis predicts the involvement of the ubiquitin/26S proteasome proteolytic pathway in the RNase-based gametophytic self-incompatibility system.
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