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The role of maternal effects on offspring performance in familiar and novel environments
Heredity ( IF 3.8 ) Pub Date : 2021-04-06 , DOI: 10.1038/s41437-021-00431-y
Milan Vrtílek 1 , Pierre J C Chuard 2 , Maider Iglesias-Carrasco 3 , Zhuzhi Zhang 3 , Michael D Jennions 3 , Megan L Head 3
Affiliation  

Maternal effects are an important evolutionary force that may either facilitate adaptation to a new environment or buffer against unfavourable conditions. The degree of variation in traits expressed by siblings from different mothers is often sensitive to environmental conditions. This could generate a Maternal-by-Environment interaction (M × E) that inflates estimates of Genotype-by-Environment effects (G × E). We aimed to test for environment-specific maternal effects (M × E) using a paternal full-sib/half-sib breeding design in the seed beetle Callosobruchus maculatus, where we split and reared offspring from the same mother on two different bean host types—original and novel. Our quantitative genetic analysis indicated that maternal effects were very small on both host types for all the measured life-history traits. There was also little evidence that maternal oviposition preference for a particular host type predicted her offspring’s performance on that host. Further, additive genetic variance for most traits was relatively high on both hosts. While there was higher heritability for offspring reared in the novel host, there was no evidence for G × Es, and most cross-host genetic correlations were positive. This suggests that offspring from the same family ranked similarly for performance on both host types. Our results point to a genetic basis of host adaptation in the seed beetle, rather than maternal effects. Even so, we encourage researchers to test for potential M × Es because, due to a lack of testing, it remains unclear how often they arise.



中文翻译:

母亲对后代在熟悉和新环境中表现的影响

母体效应是一种重要的进化力量,可以促进适应新环境或缓冲不利条件。来自不同母亲的兄弟姐妹所表达的性状差异程度通常对环境条件很敏感。这可能会产生母体与环境的相互作用 (M × E),从而夸大了基因型与环境效应 (G × E) 的估计值。我们的目的是在种子甲虫Callosobruchus maculatus中使用父本全同胞/半同胞育种设计来测试环境特定的母体效应 (M × E),我们在两种不同的 bean 宿主类型(原始的和新颖的)上分裂并抚养同一个母亲的后代。我们的定量遗传分析表明,对于所有测量的生活史特征,母性对两种宿主类型的影响都非常小。也几乎没有证据表明母体对特定宿主类型的产卵偏好可以预测她的后代在该宿主上的表现。此外,大多数性状的加性遗传变异在两个宿主上都相对较高。虽然在新宿主中饲养的后代具有更高的遗传力,但没有 G × Es 的证据,并且大多数跨宿主遗传相关性是正的。这表明来自同一家族的后代在两种宿主类型上的表现排名相似。我们的结果指出了种子甲虫宿主适应的遗传基础,而不是母体效应。即便如此,我们鼓励研究人员测试潜在的 M × Es,因为由于缺乏测试,它们出现的频率仍然不清楚。

更新日期:2021-04-06
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