QUANTITATIVE GENETICS IN PLANTS - THE EFFECT OF THE BREEDING SYSTEM ON GENETIC-VARIABILITY
QUANTITATIVE GENETICS IN PLANTS - THE EFFECT OF THE BREEDING SYSTEM ON GENETIC-VARIABILITY
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DOI：
10.1111/j.1558-5646.1995.tb02326.x
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发表时间：
1995-10-01
期刊：
影响因子：
3.3
通讯作者：
CHARLESWORTH, B
中科院分区：
文献类型：
--
作者：
CHARLESWORTH, D;CHARLESWORTH, B
在各种维持这种变异的模型下，研究了育种系统对数量遗传变异的预期影响，特别强调了随机交配和高度自交受精群体之间的对比。综述了植物群体中定量遗传参数的估计。有一些证据表明，与近亲繁殖的种群相比，高度近亲繁殖的种群内遗传变异减少，但还需要更多的实证研究。尽管对育种系统影响程度的估计存在相当大的误差，但如果变异是通过显性或中性突变维持的，那么近交种群中遗传变异的减少似乎比预期的要大。它与涉及突变选择平衡的模型更为一致，尽管估计遗传变异的减少比理论上预期的要大得多。我们讨论了自恋者遗传变异水平低于这些模型预测的一些可能原因。
The expected effects of breeding system on quantitative genetic variation under various models for the maintenance of such variation are examined, with particular emphasis on the contrast between randomly mating and highly self-fertilizing populations. Estimates of quantitative genetic parameters from plant populations are reviewed. There is some evidence for reduced within-population genetic variance in highly inbreeding populations, compared with outbreeders, but more empirical work appears necessary. Although the estimate of the magnitude of the effect of breeding system is subject to considerable error, the reduction in genetic variance in inbreeding populations appears greater than expected if the variation were maintained by overdominance, or if it were due to neutral mutations. It is more consistent with models involving mutation-selection balance, although a rather larger reduction in genetic variance is estimated than is expected theoretically. We discuss some possible reasons for the lower level of genetic variance in selfers than is predicted by such models.