Porcher Emmanuelle, Lande Russell
Department of Biology, 0116, University of California - San Diego, La Jolla, CA 92093, USA.
New Phytol. 2005 May;166(2):673-84. doi: 10.1111/j.1469-8137.2005.01363.x.
Reproductive compensation, the replacement of dead embryos by potentially viable ones, is known to play a major role in the maintenance of deleterious mutations in mammalian populations. However, it has received little attention in plant evolution. Here we model the joint evolution of mating system and inbreeding depression with reproductive compensation. We used a dynamic model of inbreeding depression, allowing for partial purging of recessive lethal mutations by selfing. We showed that reproductive compensation tended to increase the mean number of lethals in a population, but favored self-fertilization by effectively decreasing early inbreeding depression. When compensation depended on the selfing rate, stable mixed mating systems can occur, with low to intermediate selfing rates. Experimental evidence of reproductive compensation is required to confirm its potential importance in the evolution of plant mating systems. We suggest experimental methods to detect reproductive compensation.
生殖补偿，即用潜在可存活的胚胎替代死亡胚胎，已知在维持哺乳动物群体中的有害突变方面发挥着重要作用。然而，它在植物进化中却很少受到关注。在此，我们构建了具有生殖补偿的交配系统和近亲繁殖衰退的联合进化模型。我们使用了一个近亲繁殖衰退的动态模型，该模型允许通过自交部分清除隐性致死突变。我们发现，生殖补偿倾向于增加种群中致死基因的平均数量，但通过有效降低早期近亲繁殖衰退而有利于自体受精。当补偿依赖于自交率时，可能会出现稳定的混合交配系统，自交率低至中等。需要生殖补偿的实验证据来证实其在植物交配系统进化中的潜在重要性。我们提出了检测生殖补偿的实验方法。
