Population differentiation and genetic variation in host choice among pea aphids from eight host plant genera
Population differentiation and genetic variation in host choice among pea aphids from eight host plant genera
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DOI：
10.1111/j.0014-3820.2006.tb00502.x
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发表时间：
2006-08-01
期刊：
影响因子：
3.3
通讯作者：
Via, Sara
中科院分区：
文献类型：
--
作者：
Ferrari, Julia;Godfray, H. Charles J.;Via, Sara
栖息地选择在寄主范围演化、特化和生态物种形成过程中起着关键作用。豌豆蚜虫、豌豆蚜、来自北美东部的苜蓿和红三叶草的种群已知是遗传分化的，并且显示出对适当宿主植物的遗传偏好。这个物种的饲料更多的主机，在这里，我们报告了一项研究，在寄主植物的偏好内和之间的豌豆蚜虫种群收集在英格兰东南部的8个属的寄主植物的遗传变异。大多数与宿主相关的种群表现出强烈的、基于遗传的对它们所收集的宿主植物的偏好。只有在一种情况下（从野豌豆和三叶草种群）的植物偏好谱种群之间的差异不大。所有的人口表现出显着的第二个偏好的植物上饲养的所有蚜虫线：蚕豆，蚕豆，以前建议是一个“通用主机”豌豆蚜虫。在我们的样本中的主机偏好的总遗传方差，61%可以归因于收集主机植物的偏好和进一步的9%的系统性差异，在第二个偏好与剩余代表种群内的遗传变异之间的克隆。我们讨论了如何结合寄主植物的偏好和交配的寄主植物可能会促进当地的适应和可能的生态物种形成，以及是否被广泛接受的主机可以通过介导不同种群之间的基因流反对物种形成。
Habitat choice plays a critical role in the processes of host range evolution, specialization, and ecological speciation. Pea aphid, Acyrthosiphon pisum, populations from alfalfa and red clover in eastern North America are known to be genetically differentiated and show genetic preferences for the appropriate host plant. This species feeds on many more hosts, and here we report a study of the genetic variation in host plant preference within and between pea aphid populations collected from eight genera of host plants in southeastern England. Most host-associated populations show a strong, genetically based preference for the host plant from which they were collected. Only in one case (populations from Vicia and Trifolium) was there little difference in the plant preference spectrum between populations. All populations showed a significant secondary preference for the plant on which all the aphid lines were reared: broad bean, Vicia faba, previously suggested to be a "universal host" for pea aphids. Of the total genetic variance in host preference within our sample, 61% could be attributed to preference for the collection host plant and a further 9% to systematic differences in secondary preferences with the residual representing within-population genetic variation between clones. We discuss how a combination of host plant preference and mating on the host plant may promote local adaptation and possibly ecological speciation, and whether a widely accepted host could oppose speciation by mediating gene flow between different populations.