Frequent Introgressions from Diploid Species Contribute to the Adaptation of the Tetraploid Shepherd's Purse (Capsella bursa-pastoris)
Frequent Introgressions from Diploid Species Contribute to the Adaptation of the Tetraploid Shepherd's Purse (Capsella bursa-pastoris)
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DOI：
10.1016/j.molp.2014.11.016
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发表时间：
2015-03-02
期刊：
影响因子：
27.5
通讯作者：
Guo, Ya-Long
中科院分区：
文献类型：
--
作者：
Han, Ting-Shen;Wu, Qiong;Guo, Ya-Long
适应是生物在不同生境中生存的最重要的能力。动物可以选择逃离压力环境，但植物没有。在植物中，多倍体由约30%-70%的被子植物和95%的蕨类植物组成，其中一些是重要的作物，如棉花和小麦。多倍体植物如何适应不同的生境一直是一个基本的问题仍然没有答案。四倍体荠菜（Capsella bursa-pastoris）是世界上最成功的植物之一，分布于世界各地，是研究多倍体植物适应性的理想模式系统。我们发现，有频繁的渐渗从同源二倍体的牧羊人的钱包。生态位模拟结果表明，渐渗处理与非渐渗处理之间存在明显的生态分化。bursa-pastoris，基因渗入是适应的来源。这一结果将进化过程与多倍体的适应联系起来，并为多倍体的育种策略提供了启示。我们的结论是，同源二倍体的频繁渗入有助于获得足够的遗传变异，从而使C。bursa-pastoris以适应世界各地的各种生境。我们的研究结果突出了多倍体如何在起源后成功建立。
Adaptation is the most important ability for organisms to survive in diverse habitats. Animals have the option to escape from stressful environments, but plants do not. In plants, polyploids consist of about 30%-70% angiosperms and 95% ferns, of which some are important crops such as cotton and wheat. How polyploid plants adapt to various habitats has been a fundamental question remained largely unanswered. The tetraploid Shepherd's purse (Capsella bursa-pastoris) is one of the most successful plants on earth and has been distributed across the world, thus being an ideal model system for studying the adaptation of polyploids. We found that there are frequent introgressions from congeneric diploids to Shepherd's purse. Ecological niche modeling suggests that ecological differentiation is evident between the introgressed and non-introgressed C. bursa-pastoris, and the introgressions are a source of adaptation. This result links an evolutionary process to the adaptation of polyploids, and sheds light on the breeding strategy of polyploids as well. We conclude that frequent introgressions from congeneric diploids contributed to the acquisition of adequate genetic variations, thereby allowing C. bursa-pastoris to adapt to various habitats across the world. Our results highlight how a polyploid could have successfully established after it originated.