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Plant and Cell Physiology Advance Access originally published online on December 28, 2005
Plant and Cell Physiology 2006 47(3):340-345; doi:10.1093/pcp/pci250
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Interspecific Pairs of Class II S Haplotypes Having Different Recognition Specificities between Brassica oleracea and Brassica rapa

Yutaka Sato, Keiichi Sato1 and Takeshi Nishio*

Graduate School of Agricultural Science, Tohoku University, Sendai, 981-8555 Japan

* Corresponding author: E-mail, nishio{at}bios.tohoku.ac.jp; Fax, +81-22-717-8654.

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 a 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 those of 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 discussed herein.

The nucleotide sequences reported in this paper have been submitted to GenBank under accession numbers AB201306 [GenBank] and AB201307 [GenBank] .

1 Present address: Kofu Higashi High School, Sakaori 1-17-1, Kofu, Yamanashi, 400-0805 Japan.

(Received October 20, 2005; Accepted December 20, 2005)
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