Quantitative genetics of feeding behavior in two ecological races of the pea aphid, Acyrthosiphon pisum
Quantitative genetics of feeding behavior in two ecological races of the pea aphid, Acyrthosiphon pisum
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DOI：
10.1038/hdy.2011.24
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发表时间：
2012-03-01
期刊：
影响因子：
3.8
通讯作者：
Via, S.
中科院分区：
文献类型：
--
作者：
Caillaud, M. C.;Via, S.
草食昆虫的多样性很大程度上源于种群对不同寄主植物的适应性分化。这通常涉及宿主接受的特殊模式的进化，进而导致仅在宿主上交配的昆虫的选型交配。在这里，我们探索了一种草食性昆虫——豌豆蚜（Acyrthosiphon pisum）的摄食行为的遗传结构，这种昆虫已成为研究早期物种形成的模型。我们使用专门种植苜蓿或红三叶草的个体之间的杂交，以便对关键摄食行为进行生物特征分析和数量性状基因座 (QTL) 分析。对于每个环境中的每个角色，Castle-Wright 的有效隔离因素数量估计范围为 0.11 到 2.54。同样，检测到 0 到 3 个 QTL。在一个案例中，单个 QTL 解释了 F2 中超过 50% 的变异，表明至少一个基因（或紧密连锁基因的复合体）对豌豆蚜的取食行为具有重大影响。然而，所鉴定的 OIL 只能解释这些性状的 23-73% 的遗传变异，因此还涉及影响较小的其他基因。我们发现了多种基因作用模式，包括几种非加性基因作用的情况。我们的结果表明豌豆蚜的取食行为既不是简单的也不是高度多基因的。摄食行为变异的寡遗传基础可能促进宿主转移，为草食昆虫的频繁分化和物种形成提供一种解释。遗传 (2012) 108, 211-218; doi：10.1038/hdy.2011.24； 2011 年 9 月 7 日在线发布
Much of the diversity of herbivorous insects stems from the adaptive divergence of populations onto different host plants. This often involves the evolution of specialized patterns of host acceptance that in turn lead to assortative mating for insects that mate exclusively on their hosts. Here, we explore the genetic architecture of feeding behavior in a herbivorous insect that has become a model for the study of incipient speciation, the pea aphid (Acyrthosiphon pisum). We use crosses between individuals specialized to either alfalfa or red clover in order to perform both a biometrical analysis and a quantitative trait locus (QTL) analysis of key feeding behaviors. For each character in each environment, Castle-Wright's estimator for the number of effective factors segregating ranged from 0.11 to 2.54. Similarly, between 0 and 3 QTLs were detected. In one case, a single QTL explained over 50% of the variance in the F2, suggesting that at least one gene (or a complex of tightly linked genes) has a major effect on feeding behavior in the pea aphid. However, the identified OIL explain only 23-73% of the genetic variance for these characters thus additional genes of minor effect are also involved. We found a variety of modes of gene action, including several cases of non-additive gene action. Our results suggest that feeding behavior in pea aphids is neither simple nor highly polygenic. The oligogenetic basis of variation in feeding behavior may facilitate host shifts, providing one explanation for the frequent divergence and speciation of herbivorous insects. Heredity (2012) 108, 211-218; doi:10.1038/hdy.2011.24; published online 7 September 2011