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Plant and Cell Physiology Advance Access published online on December 28, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci250
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received October 20, 2005
Accepted December 20, 2005

Regular Paper

Interspecific Pairs of Class-II S Haplotypes Having Different Recognition Specificities between Brassica oleracea and Brassica rapa

Yutaka Sato 1, Keiichi Sato 2, and Takeshi Nishio 1 *

1 Graduate School of Agricultural Science, Tohoku University, Sendai 981-8555, Japan
2 Graduate School of Agricultural Science, Tohoku University, Sendai 981-8555, Japan; Present address: Shirane High School, Kamiimasuwa 1180, Shirane, Yamanashi 400-0211, Japan

* To whom correspondence should be addressed.
Takeshi Nishio, E-mail: nishio{at}bios.tohoku.ac.jp


  Abstract

There are several pairs of similar class-I S haplotypes between Brassica oleracea and Brassica rapa. The similar S halotypes in these interspecific pairs have been reported to have the same recognition specificities. In the present study, three interspecific pairs showing the high sequence similarity were found in class-II S haplotypes, i.e., between BoS-2b (B. oleracea S-2b) and BrS-44 (B. rapa S-44), between BoS-5 and BrS-40, and between BoS-15 and BrS-60. By pollination tests using interspecific hybrids between B. oleracea and B. rapa, BoS-5 and BoS-2b were revealed to have slightly and completely different recognition specificities from BrS-40 and BrS-44, respectively. The recognition reaction between SP11 and SRK of BoS-15 was suggested to be incomplete. The regions of class-II SP11 and SRK important for self-recognition specificity and the diversification of class-II S haplotypes are herein discussed.

Keywords: Brassica oleracea; Brassica rapa; diversification; interspecific pairs; recognition specificity; self-incompatibility.
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