Self-incompatibility (SI) is a mechanism for preventing self-fertilization in flowering plants. SI is controlled by a single S-locus with multiple haplotypes (S-haplotypes). When the pistil and pollen share the same S-haplotype, the pollen is recognized as self and rejected by the pistil. This review introduces our research on Brassicaceae and Solanaceae SI systems to identify the S-determinants encoded at the S-locus and uncover the mechanisms of self/nonself-discrimination and pollen rejection. The recognition mechanisms of SI systems differ between these families. A self-recognition system is adopted by Brassicaceae, whereas a collaborative nonself-recognition system is used by Solanaceae. Work by our group and subsequent studies indicate that plants have evolved diverse SI systems.

自交不亲和性（SI）是一种阻止开花植物自体受精的机制。 SI 由具有多个单倍型（S单倍型）的单个S基因座控制。当雌蕊和花粉具有相同的S单倍型时，花粉被识别为自体并被雌蕊拒绝。这篇综述介绍了我们对十字花科和茄科 SI 系统的研究，以确定S基因座编码的S决定簇，并揭示自体/非自体歧视和花粉排斥的机制。这些家族之间的 SI 系统的识别机制有所不同。十字花科采用自我识别系统，而茄科采用协作非自我识别系统。我们小组的工作和随后的研究表明植物已经进化出了不同的 SI 系统。