Epistasis and the genetic divergence of photoperiodism between populations of the pitcher-plant mosquito, Wyeomyia smithii.
Epistasis and the genetic divergence of photoperiodism between populations of the pitcher-plant mosquito, Wyeomyia smithii.
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猪笼草蚊子 Wyeomyia smithii 种群之间光周期现象的上位性和遗传差异。
DOI：
10.1093/genetics/131.2.389
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发表时间：
1992
期刊：
影响因子：
3.3
通讯作者：
Holzapfel,CM
中科院分区：
文献类型：
--
作者：
Hard,JJ;Bradshaw,WE;Holzapfel,CM
两个南方（祖先）和一个北方（派生）人口的猪笼草蚊子，Wyeomyia smithii，平行杂交，以确定在关键光周期，一个物候特征，措施适应季节性沿着气候梯度的人口分歧的遗传成分。联合尺度检验被用来分析第一代和第二代杂种的平均值和方差，以确定非加性遗传方差，特别是上位性方差，是否有助于在临界光周期的分歧。在这两个杂交，双基因上位效应是非常显着的，表明遗传分化不能只导致从加性作用位点的差异。对于一个交叉，可以直接测试这样的效果，高阶上位性和/或连锁没有贡献的组成群体之间的临界光周期的分歧。
Parallel crosses between each of two southern (ancestral) and one northern (derived) population of the pitcher-plant mosquito, Wyeomyia smithii, were made to determine the genetic components of population divergence in critical photoperiod, a phenological trait that measures adaptation to seasonality along a climatic gradient. Joint scaling tests were used to analyze means and variances of first- and second-generation hybrids in order to determine whether nonadditive genetic variance, especially epistatic variance, contributed to divergence in critical photoperiod. In both crosses, digenic epistatic effects were highly significant, indicating that genetic divergence cannot have resulted solely from differences in additively acting loci. For one cross that could be tested directly for such effects, higher order epistasis and/or linkage did not contribute to the divergence of critical photoperiod between the constituent populations.