Division of Biochemistry, University of Missouri, Columbia, Missouri, USA.
Adv Exp Med Biol. 2012;738:108-23. doi: 10.1007/978-1-4614-1680-7_7.
Self-incompatibility (SI) is a common form of genetically-controlled mate-selection that prevents mating between closely related plants of the same species. SI occurs in about half of all flowering plant species. It has been studied extensively in the Papaveraceae (poppy), Brassicaceae (Arabidopsis, cabbage etc), Solanaceae (potato, tomato etc), Plantaginaceae (snapdragon) and Rosaceae (apple, cherry and peach etc). The self-recognition inherent in self-incompatibility has similarities with animal and plant immunity systems giving rise to speculation that the systems are related. Both systems display balancing selection, 'self/nonself' recognition, high polymorphism, high specificity and there are also some similarities in the rejection mechanisms deployed in the two systems. Whether these systems have diverged from a common predecessor is discussed, however similarities may be driven more by biological problems and the available molecular machinery to solve them than by an evolutionary relationship.
自交不亲和性（SI）是一种常见的基因控制的配偶选择形式，可防止同一物种的亲缘关系密切的植物交配。SI 发生在大约一半的有花植物物种中。它在罂粟科（罂粟）、十字花科（拟南芥、甘蓝等）、茄科（土豆、番茄等）、车前科（金鱼草）和蔷薇科（苹果、樱桃和桃子等）中得到了广泛研究。自交不亲和性中的自我识别与动植物免疫系统具有相似性，这引发了人们对这两个系统是否相关的猜测。这两个系统都显示出平衡选择、“自我/非自我”识别、高多态性、高特异性，而且在两个系统中使用的排斥机制也有一些相似之处。尽管讨论了这些系统是否是从共同的祖先分化而来的，但相似性可能更多地是由生物问题和可用的分子机制来解决这些问题驱动的，而不是由进化关系驱动的。
