Genetic isolation between two sympatric host plant races of the European corn borer, Ostrinia nubilalis Hubner.: II:: assortative mating and host-plant preferences for oviposition
Genetic isolation between two sympatric host plant races of the European corn borer, Ostrinia nubilalis Hubner.: II:: assortative mating and host-plant preferences for oviposition
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DOI：
10.1038/sj.hdy.6800611
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发表时间：
2005-02-01
期刊：
影响因子：
3.8
通讯作者：
Bourguet, D
中科院分区：
文献类型：
--
作者：
Bethenod, MT;Thomas, Y;Bourguet, D
欧洲玉米螟（Ostrinia nubilalis Hubner）在玉米（Zea mays L.）在大约500年前引入欧洲后，现在被认为是这种作物的主要害虫之一。在法国北方，已描述了两个同域寄主小种：一个以玉米为食，另一个以艾蒿（Artemisia vulgaris L.）和啤酒花（Humulus lupulus L.）。在以前的研究中，我们表明，两个种族之间的交配可能会受到阻碍蛾出现的时间和女性产生的性信息素的组成的差异。在这项研究中，我们使用从玉米（Z株）和艾蒿（E株）小种中选择的菌株在两个同工酶基因座上进行诊断等位基因，进一步研究了这两个小种的遗传分离。在一个笼子里含有玉米和艾蒿植物，并位于自然条件下，交配的个体之间的同一菌株发生更频繁的交配比男性和女性之间的E和Z株。特别是，我们没有得到任何证据Z女性和E男性之间的交叉。我们还发现，女性的Z株产卵几乎完全在玉米，而女性的E株产卵优先，但不完全，艾蒿。这些结果表明，两个寄主种族之间的遗传分化也可能有利于寄主植物的偏好，同域物种形成的第一步。
The European corn borer, Ostrinia nubilalis Hubner, colonized maize ( Zea mays L.) after its introduction into Europe about 500 years ago and is now considered one of the main pests of this crop. In northern France, two sympatric host races have been described: one feeding on maize and the other on mugwort ( Artemisia vulgaris L.) and hop ( Humulus lupulus L.). In a previous study, we showed that mating between the two races may be impeded by differences in the timing of moth emergence and in the composition of the sex pheromone produced by the females. In this study, we further investigated the genetic isolation of these two races using strains from the maize (Z strain) and mugwort ( E strain) races selected for diagnostic alleles at two allozyme loci. In a cage containing maize and mugwort plants and located in natural conditions, mating between individuals of the same strain occurred more often than mating between males and females of the E and Z strains. In particular, we obtained no evidence for crosses between Z females and E males. We also found that females of the Z strain laid their eggs almost exclusively on maize, whereas females of the E strain laid their eggs preferentially, but not exclusively, on mugwort. These results suggest that the genetic differentiation between the two host races may also be favored by host-plant preference, one of the first steps toward sympatric speciation.