Population divergence of genetic (co)variance matrices in a subdivided plant species, Brassica cretica
Population divergence of genetic (co)variance matrices in a subdivided plant species, Brassica cretica
复制标题
细分植物物种（Brassica cretica）遗传（共）方差矩阵的群体分化
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
M. Widén
中科院分区：
文献类型：
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作者：
B. Widén;S. Andersson;G. Rao;M. Widén
Abstract The present study of Brassica cretica had two objectives. First, we compared estimates of population structure (Qst) for seven phenotypic characters with the corresponding measures for allozyme markers (Fst) to evaluate the supposition that genetic drift is a major determinant of the evolutionary history of this species. Secondly, we compared the genetic (co)variance (G) matrices of five populations to examine whether a long history of population isolation is associated with large, consistent differences in the genetic (co)variance structure. Differences between estimates of Fst and Qst were too small to be declared significant, indicating that stochastic processes have played a major role in the structuring of quantitative variation in this species. Comparison of populations using the common principal component (CPC) method rejected the hypothesis that the G matrices differed by a simple constant of proportionality: most of the variation involved principal component structure rather than the eigenvalues. However, there was strong evidence for proportionality in comparisons using the method of percentage reduction in mean‐square error (MSE), at least when characters with unusually high (co)variance estimates were included in the analyses. Although the CPC and MSE methods provide different, but complementary, views of G matrix variation, we urge caution in the use of proportionality as an indicator of whether genetic drift is responsible for divergence in the G matrix.
影响因子：
56.9
作者：
LANDE, R
通讯作者：
LANDE, R