Family quarrels in seeds and rapid adaptive evolution in Arabidopsis
Family quarrels in seeds and rapid adaptive evolution in Arabidopsis
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DOI：
10.1073/pnas.1817733116
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发表时间：
2019-05-07
影响因子：
11.1
通讯作者：
Queller, David C.
中科院分区：
文献类型：
--
作者：
Geist, Katherine S.;Strassmann, Joan E.;Queller, David C.
进化冲突可以推动快速的适应性进化，有时被称为军备竞赛，因为每一方都需要不断地对另一方的适应做出反应。这种军备竞赛的证据有时可以在形态、行为或宿主-病原体相互作用的性相互作用的基因中看到，但很少有先验预测。亲属选择理论预测，遗传亲属之间的利益冲突通常应该减少而不是消除，但几乎没有证据表明家庭内部的冲突是否能推动快速适应。在这里，我们测试了多种预测，关于后代从父母那里获得的资源量的冲突将如何推动开花植物拟南芥种子组织的快速分子进化。正如预测的那样，在拟南芥种子中表达的基因比在其他特殊器官中表达的基因有更多的适应性进化，在胚乳和母体组织中表达的基因比在胚胎中表达的基因更多，在参与营养转移的特定亚组织中表达的基因更多。在缺乏可信的替代假说的情况下，这些结果表明，亲缘选择和冲突在植物中是重要的，冲突不仅包括母体和后代，还包括三倍体胚乳，尽管亲属关系起到了冲突的作用，但家庭成员可以进行缓慢但稳定的象龟一样的军备竞赛。
Evolutionary conflict can drive rapid adaptive evolution, sometimes called an arms race, because each party needs to respond continually to the adaptations of the other. Evidence for such arms races can sometimes be seen in morphology, in behavior, or in the genes underlying sexual interactions of host-pathogen interactions, but is rarely predicted a priori. Kin selection theory predicts that conflicts of interest should usually be reduced but not eliminated among genetic relatives, but there is little evidence as to whether conflict within families can drive rapid adaptation. Here we test multiple predictions about how conflict over the amount of resources an offspring receives from its parent would drive rapid molecular evolution in seed tissues of the flowering plant Arabidopsis. As predicted, there is more adaptive evolution in genes expressed in Arabidopsis seeds than in other specialized organs, more in endosperms and maternal tissues than in embryos, and more in the specific subtissues involved in nutrient transfer. In the absence of credible alternative hypotheses, these results suggest that kin selection and conflict are important in plants, that the conflict includes not just the mother and offspring but also the triploid endosperm, and that, despite the conflictreducing role of kinship, family members can engage in slow but steady tortoise-like arms races.