From Russia with lobe: genetic differentiation in trilobed uncus Ostrinia spp. follows food plant, not hairy legs
From Russia with lobe: genetic differentiation in trilobed uncus Ostrinia spp. follows food plant, not hairy legs
复制标题
DOI：
10.1038/hdy.2011.58
复制
发表时间：
2011-07
期刊：
影响因子：
3.8
通讯作者：
A. Frolov;P. Audiot;D. Bourguet;A. Kononchuk;J. M. Malysh;S. Ponsard;R. Streiff;Y. Tokarev
中科院分区：
文献类型：
--
作者：
A. Frolov;P. Audiot;D. Bourguet;A. Kononchuk;J. M. Malysh;S. Ponsard;R. Streiff;Y. Tokarev
Ostrinia属（鳞翅目，草螟科）的三裂钩形分类群在物种形成的早期阶段表现出生殖隔离与形态分化、资源利用和遗传变异之间的复杂关系。根据行为学和生态学的研究结果，我们最近提出了一个假设，即根据寄主植物的不同，具有小中胸的个体属于两个不同的种。nubilalis和O.感觉肩胛肌Frolov等（2007）分别以玉米和一些双子叶植物为食。小、中、大中型的个体都属于O。肩胛骨就一直以双子叶植物为食。这与以前的分类，区分三个物种的男性胫骨中部形态，无论宿主植物。在这里，我们测试我们的假设，通过检查的遗传结构的鸵鸟种群中胫骨多态性的地区，俄罗斯西部和哈萨克斯坦，并将其与法国的人口，只有小mid-tiphilis发生。结果支持两个预测：（1）玉米和双子叶植物收集的群体在遗传上相互分化，如在法国，（2）双子叶植物收集的群体没有表现出由一个以上的物种组成的遗传证据。种间分化是无关的地理距离，尽管显着的隔离距离内的物种。因此，在大陆尺度上，两个且只有两个物种因寄主植物不同而不同。有趣的是，一个微卫星位点比其他微卫星位点对两个类群之间的分化贡献高出10倍。这值得进一步研究，因为它可能揭示了这个离群值和基因座参与寄主植物适应和/或生殖隔离之间的联系。
Trilobed uncus taxa of the genus Ostrinia (Lepidoptera, Crambidae) illustrate the complex relationship, at early stages of speciation, between reproductive isolation and differentiation in morphology, resource use and genetic variation. On the basis of behaviour and ecology, we recently hypothesized that individuals with small mid-tibiae belong to two distinct species depending on host plant—O. nubilalis and O. scapulalis sensu Frolov et al.(2007) feeding on maize and on a number of dicotyledons, respectively. Individuals with small, medium or massive mid-tibiae would all belong to O. scapulalis as long as they feed on these dicotyledons. This contrasts with previous taxonomy, which distinguished three species by male mid-tibia morphology, regardless of host plant. Here, we test our hypothesis by examining the genetic structure of Ostrinia populations from regions with mid-tibia polymorphism—Western Russia and Kazakhstan—and comparing it with that of French populations where only small mid-tibiae occur. Results support two predictions:(1) maize-and dicotyledon-collected populations are genetically differentiated from each other like in France, and (2) dicotyledon-collected populations show no genetic evidence of consisting of more than one species. Between-species differentiation was unrelated to geographic distance, despite significant isolation by distance within species. The distinction between two and only two species differing by host plant thus holds at continental scale. Interestingly, one microsatellite locus contributed∼ 10 times more than the others to differentiation between both taxa. This deserves further investigation, as it might reveal a linkage between this outlier and loci involved in host-plant adaptation and/or reproductive isolation.