THE EVOLUTION OF SELF-FERTILIZATION AND INBREEDING DEPRESSION IN PLANTS .1. GENETIC MODELS
THE EVOLUTION OF SELF-FERTILIZATION AND INBREEDING DEPRESSION IN PLANTS .1. GENETIC MODELS
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DOI：
10.2307/2408514
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发表时间：
1985-01-01
期刊：
影响因子：
3.3
通讯作者：
SCHEMSKE, DW
中科院分区：
文献类型：
--
作者：
LANDE, R;SCHEMSKE, DW
当一个种群在多基因上小步进化时，自交时的近交抑制量和异交时的杂种优势量决定了自交率的选择强度。在稳定选择条件下，通过引入突变隐性和部分显性致死性和亚致死性等位基因以及数量性状突变，构建了近交抑制随群体平均自交率变化的遗传模型。这些模型有助于解释在主要异交群体中自交导致的高近交抑制（bbb50 %），以及在主要自交群体中异交导致的相当大的杂种优势。在大多数植物种群中，显性自交和显性异交是交配系统的交替稳定状态。一个物种接近哪一种稳定状态取决于其种群结构的历史和影响自交率的基因的影响程度。
The amounts of inbreeding depression upon selfing and of heterosis upon out-crossing determine the strength of selection on the selfing rate in a population when this evolves polygenically by small steps. Genetic models are constructed which allow inbreeding depression to change with the mean selfing rate in a population by incorporating both mutation to recessive and partially dominant lethal and sublethal alleles at many loci and mutation in quantitative characters under stabilizing selection. The models help to explain observations of high inbreeding depression (> 50%) upon selfing in primarily outcrossing populations, as well as considerable heterosis upon outcrossing in primarily selfing populations. Predominant selfing and predominant outcrossing are alternative stable states of the mating system in most plant populations. Which of these stable states a species approaches depends on the history of its population structure and the magnitude of effect of genes influencing the selfing rate.