Strain specific genotype-environment interactions and evolutionary potential for body mass in brook charr (Salvelinus fontinalis).
Strain specific genotype-environment interactions and evolutionary potential for body mass in brook charr (Salvelinus fontinalis).
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DOI：
10.1534/g3.112.005017
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发表时间：
2013-03
期刊：
影响因子：
--
通讯作者：
Garant D
中科院分区：
文献类型：
--
作者：
Crespel A;Bernatchez L;Audet C;Garant D
区分表型变异的遗传和环境原因是了解种群进化潜力的基本要求。然而，个体发育过程中同种群体和环境之间遗传变异的差异程度却很少被研究。在这项研究中，测量了不同饲养环境和不同时间段的三种不同品系的红点鲑（Salvelinus fontinalis）的体重遗传基础。结果表明，体重在所有品系中都是可遗传的性状，但遗传力水平在品系之间存在很大差异。此外，每个菌株的遗传力估计根据环境饲养条件的不同而有所不同，并且跨环境相关性均显着低于统一性，表明基因型与环境相互作用的菌株特异性模式。遗传力估计值在整个个体发育过程中也有所不同，从 9 月龄到 21 月龄下降了 50%。这项研究强调了这些菌株之间遗传结构和进化潜力的差异，并强调了根据环境变化考虑对选择反应的菌株特异性潜力的重要性。
Discriminating between genetic and environmental causes of phenotypic variation is an essential requirement for understanding the evolutionary potential of populations. However, the extent to which genetic variation differs among conspecific groups and environments during ontogeny has rarely been investigated. In this study, the genetic basis of body mass was measured in three divergent strains of brook charr (Salvelinus fontinalis) in different rearing environments and at different time periods. The results indicate that body mass was a heritable trait in all strains but that the level of heritability greatly differed among strains. Moreover, heritability estimates of each strain varied differently according to environmental rearing conditions, and cross-environments correlations were all significantly lower than unity, indicating strain-specific patterns of genotype–environment interactions. Heritability estimates also varied throughout ontogeny and decreased by 50% from 9 to 21 months of age. This study highlights the divergence in genetic architecture and evolutionary potential among these strains and emphasizes the importance of considering the strain-specific potential of the response to selection according to environmental variation.
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