Genetic linkage of ecological specialization and reproductive isolation in pea aphids
Genetic linkage of ecological specialization and reproductive isolation in pea aphids
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DOI：
10.1038/35091062
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发表时间：
2001-08-30
期刊：
影响因子：
64.8
通讯作者：
Via, S
中科院分区：
文献类型：
--
作者：
Hawthorne, DJ;Via, S
生态专业化的进化产生生物多样性，并可能导致物种形成（1 - 3）。基因结构可以加速或延缓这一过程。如果资源利用和配偶选择通过多效性或紧密连锁具有共同的遗传基础，那么由此产生的遗传相关性可以促进专业化和生殖隔离的联合进化，促进物种形成（4 - 6）。在这里，我们提出了一个模型的遗传相关性的作用，在专业化和物种形成，并测试它通过分析在两个高度专业化的主机比赛的豌豆蚜虫（Acyrthosiphon豌豆;半翅目：蚜虫科）的关键性状的遗传结构。我们发现了几个复合的多效性或紧密连锁的数量性状位点（QTL），影响关键性状的方式，将促进物种形成：QTL与拮抗作用的性能上的两个主机是连锁的QTL，产生asortative交配（通过生境选择）。这种类型的遗传结构可能是常见的分类群，形成不同的自然选择。
The evolution of ecological specialization generates biological diversity and may lead to speciation(1-3). Genetic architecture can either speed or retard this process. If resource use and mate choice have a common genetic basis through pleiotropy or close linkage, the resulting genetic correlations can promote the joint evolution of specialization and reproductive isolation, facilitating speciation(4-6). Here we present a model of the role of genetic correlations in specialization and speciation, and test it by analysing the genetic architecture of key traits in two highly specialized host races of the pea aphid (Acyrthosiphon pisum pisum; Hemiptera : Aphididae). We found several complexes of pleiotropic or closely linked quantitative trait loci (QTL) that affect key traits in ways that would promote speciation: QTL with antagonistic effects on performance on the two hosts are linked to QTL that produce asortative mating (through habitat choice). This type of genetic architecture may be common in taxa that have speciated under divergent natural selection.