Progress on characterization of self-incompatibility in Brassica napus L.
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Self-incompatibility (SI) is a widespread mechanism in flowering plants that promotes outbreeding and thereby increases genetic diversity. Recognition specificity in Brassica is achieved by the interaction of the female determinant S-receptor kinase (SRK) and its ligand, the male determinant S-locus protein 11 (SP11). The interaction between SP11 and SRK triggers the signaling cascade in an S-haplotype-specific manner and results in the rejection of self-pollen, but the signal components involved are still not well characterized. S haplotypes are widespread in self-compatible amphidiploid B. napus, and the interaction of heterozygous S haplotypes causes the loss of SI. This review highlights the recent advances made towards understanding the genetic analysis, distribution, and evolution of S haplotypes, the signal factors, and the potential of SI in B. napus hybrid breeding program.
KeywordsSelf-incompatibility S haplotype Genetic analysis Hybrid breeding B. napus
The authors are grateful to several anonymous reviewers for helpful suggestions in revising the manuscript. This research was financed by funds from the “863” Project (2009AA101105) and the National Natural Science Funds (30971802).
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