The S receptor kinase determines self-incompatibility in Brassica stigma

Takeshi Takasaki (), Katsunori Hatakeyama, Go Suzuki, Masao Watanabe, Akira Isogai and Kokichi Hinata
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Takeshi Takasaki: Research Institute of Seed Production Co., Ltd.
Katsunori Hatakeyama: Research Institute of Seed Production Co., Ltd.
Go Suzuki: Osaka Kyoiku University
Masao Watanabe: Faculty of Agriculture, Iwate University
Akira Isogai: Graduate School of Biological Sciences, Nara Institute of Science and Technology
Kokichi Hinata: Research Institute of Seed Production Co., Ltd.

Nature, 2000, vol. 403, issue 6772, 913-916

Abstract: Abstract The self-incompatibility possessed by Brassica is an intraspecific reproductive barrier by which the stigma rejects self-pollen but accepts non-self-pollen for fertilization. The molecular/biochemical bases of recognition and rejection have been intensively studied. Self-incompatibility in Brassica is sporophytically controlled by the polymorphic S locus1. Two tightly linked polymorphic genes at the S locus, S receptor kinase gene (SRK) and S locus glycoprotein gene (SLG), are specifically expressed in the papillar cells of the stigma2,3,4, and analyses of self-compatible lines5,6,7 of Brassica have suggested that together they control stigma function in self-incompatibility interactions. Here we show, by transforming self-incompatible plants of Brassica rapa with an SRK28 and an SLG 28 transgene separately, that expression of SRK28 alone, but not SLG28 alone, conferred the ability to reject self (S28)-pollen on the transgenic plants. We also show that the ability of SRK28 to reject S28 pollen was enhanced by SLG28. We conclude that SRK alone determines S haplotype specificity of the stigma, and that SLG acts to promote a full manifestation of the self-incompatibility response.

Date: 2000
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DOI: 10.1038/35002628

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