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Plant and Cell Physiology, 2001, Vol. 42, No. 6 560-565
© 2001 Oxford University Press

Molecular Aspects of Self-Incompatibility in Brassica Species

Masao Watanabe ,1,3, Katsunori Hatakeyama2, Yoshinobu Takada1 and Kokichi Hinata2 1 Laboratory of Plant Breeding, Faculty of Agriculture, Iwate University, Morioka, 020-8550 Japan 2 Research Institute of Seed Production Co. Ltd., Aoba-ku, Sendai, 989-3204 Japan

Many flowering plants possess self-incompatibility (SI) systems to prevent inbreeding. SI in Brassica species is controlled by a single S locus with multiple alleles. In recent years, much progress has been made in determining the male and female S determinant in Brassica species. In the female, a gain-of-function experiment clearly demonstrated that SRK was the sole S determinant, and that SLG enhanced the SI recognition process. By contrast, the male S determinant (termed SP11/SCR) was identified in the course of genome analysis of S locus to be a small cysteine-rich protein, which was classified as a pollen coat protein. This SP11/SCR may function as a ligand for the S domain of SRK in the SI recognition reaction of Brassica species.

3 Corresponding author: E-mail, nabe@iwate-u.ac.jp; Fax, +81-19-621-6177.


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