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：
10.1111/j.1558-5646.1985.tb04077.x
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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
自交时近交抑制的程度和异型杂交时杂种优势的程度决定了当群体以小步多基因进化时对自交率的选择强度。构建了遗传模型，通过在许多位点结合隐性和部分显性致死和亚致死等位基因的突变以及稳定选择下数量性状的突变，允许近交抑制随群体中的平均自交率而变化。这些模型有助于解释在主要异交群体中自交时观察到的高近交衰退（> 50%），以及在主要自交群体中异交时相当大的杂种优势。在大多数植物种群中，优势自交和优势异交是交配系统的替代稳定状态。一个物种接近哪种稳定状态取决于其种群结构的历史以及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.