Biometry Section, Waite Agricultural Research Institute, The University of Adelaide, Adelaide, Australia.
Theor Appl Genet. 1987 Oct;74(6):789-92. doi: 10.1007/BF00247558.
Multi-locus self-incompatibility systems offer few obvious adaptive advantages to the species possessing them. However, the gametophytic system's independent gene action allows the separate genes in a two gene system to behave as if they were individually not involved in a systematic disruption of panmixia. Under such circumstances, fixation of one of the two genes is readily obtained if an allele possesses a selective advantage. The resulting single gene system (the classic Nicotiana system) is then resistant to disruption, except by genes which allow selfing, which rapidly reach fixation.
多基因自交不亲和系统为具有该系统的物种提供的明显适应优势很少。然而，配子体系统的独立基因作用使得在双基因系统中的独立基因表现得好像它们各自没有参与系统性破坏随机交配一样。在这种情况下，如果一个等位基因具有选择性优势，那么其中一个基因的固定就很容易获得。由此产生的单基因系统（经典的烟草系统）就变得不易受破坏，除非有允许自交的基因，这些基因会迅速达到固定。
