INTRALOCUS SEXUAL CONFLICT AND ENVIRONMENTAL STRESS
INTRALOCUS SEXUAL CONFLICT AND ENVIRONMENTAL STRESS
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DOI：
10.1111/evo.12439
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发表时间：
2014-08-01
期刊：
影响因子：
3.3
通讯作者：
Arnqvist, Goran
中科院分区：
文献类型：
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作者：
Berger, David;Grieshop, Karl;Arnqvist, Goran
当特定基因座的选择倾向于雄性和雌性的不同等位基因时，就会发生基因座内性冲突（IaSC），这对适应造成了根本性的限制。然而，在有条件的有害突变暴露于选择的压力环境中，IaSC对适应的相对影响可能会降低。雄性和雌性之间适合度的遗传相关（r(MF)）提供了整个基因组IaSC的量化。我们比较常设委员会在一个良性的(29摄氏度)和压力(36摄氏度)的温度估计r (MF)的两个自然种群种子甲虫Callosobruchus maculatus使用isofemale线。在一个种群中，我们发现良性条件下大量的IaSC为负r(MF)(-0.51)，正如预测的那样，应激条件下IaSC的显著减少为正r(MF)（0.21）。其他种群在两个温度下均表现出较低的IaSC (r(MF): 0.38；0.40)。在这两个种群中，在良性环境下含有对雄性有利但对雌性有害的等位基因的同雌系，在压力下往往表现出整体的低适应性。这些结果支持了应激条件下IaSC较低的观点，并表明雄性性选择的环境敏感和条件有害等位基因介导了IaSC的变化。我们讨论了在有性繁殖的种群中适应性进化的含义。
Intralocus sexual conflict (IaSC) occurs when selection at a given locus favors different alleles in males and females, placing a fundamental constraint on adaptation. However, the relative impact of IaSC on adaptation may become reduced in stressful environments that expose conditionally deleterious mutations to selection. The genetic correlation for fitness between males and females (r(MF)) provides a quantification of IaSC across the genome. We compared IaSC at a benign (29 degrees C) and a stressful (36 degrees C) temperature by estimating r(MF)s in two natural populations of the seed beetle Callosobruchus maculatus using isofemale lines. In one population, we found substantial IaSC under benign conditions signified by a negative r(MF) (-0.51) and, as predicted, a significant reduction of IaSC under stress signified by a reversed and positive r(MF) (0.21). The other population displayed low IaSC at both temperatures (r(MF): 0.38; 0.40). In both populations, isofemale lines harboring alleles beneficial to males but detrimental to females at benign conditions tended to show overall low fitness under stress. These results offer support for low IaSC under stress and suggest that environmentally sensitive and conditionally deleterious alleles that are sexually selected in males mediate changes in IaSC. We discuss implications for adaptive evolution in sexually reproducing populations.