Extensive reticulate evolution within Fargesia (s.l.) (Bambusoideae: Poaceae) and its allies: Evidence from multiple nuclear markers.,Molecular Phylogenetics and Evolution

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Extensive reticulate evolution within Fargesia (s.l.) (Bambusoideae: Poaceae) and its allies: Evidence from multiple nuclear markers.
Molecular Phylogenetics and Evolution ( IF 3.6 ) Pub Date : 2020-04-17 , DOI: 10.1016/j.ympev.2020.106842
Yun Zhou ₁ , Wan-Wan Li ₁ , Yu-Qu Zhang ₁ , Xiao-Cheng Xing ₁ , Jian-Qiang Zhang ₁ , Yi Ren ₁

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Reticulate evolution resulting from hybridization and introgression has been recognized as a creative source of species and diversification in bamboos. Previous phylogenetic studies revealed that Fargesia (s.l.) (Fargesia and Yushania) was divided into the Fargesia spathe clade and the non-spathe clade. Interestingly, the Fargesia spathe clade may have originated from hybridization among other clades within Fargesia (s.l.). Understanding the hybrid origin of this clade requires a robust phylogenetic framework in which major clades within Fargesia (s.l.) are resolved. Here, we used three nuclear genes to reconstruct the evolutionary history of Fargesia (s.l.) and its allies to identify putative patterns in the origin of the Fargesia spathe clade and to examine the extent to which reticulate evolution has occurred at the interspecific level in bamboos. Bashania species form a clade with Fargesia (s.l.), which is further divided into Group I and Group II. The Fargesia spathe clade, the Alpine Bashania clade, and Fargesia yajiangensis comprise Group I, while the Bashania fargesii clade and the remaining Fargesia (s.l.) species form Group II. Incongruence between the current nuclear-based and previous plastid phylogenies demonstrate several possible hybridization events among Fargesia (s.l.) species and related taxa, which have given rise to the Fargesia spathe clade, the Phyllostachys clade, and the Ampelocalamus clade. We also detected several putative hybrid species of Fargesia (s.l.). Our results show that reticulate evolution has played a prominent role in Fargesia (s.l.) evolution, which could, in part, account for the taxonomic difficulty associated with Fargesia (s.l.) and the alpine bamboos. The study also underscores the importance of hybridization in the evolution of bamboos, at both intergeneric and intrageneric levels.

中文翻译：

Fargesia（sl）（Bambusoideae：Poaceae）及其盟友内部广泛的网状进化：来自多个核标记的证据。

杂交和渗入引起的网状进化被认为是竹子物种和多样化的创造性来源。先前的系统发育研究表明，Fargesia（sl）（Fargesia和Yushania）被分为Fargesia spathe进化枝和非spage进化枝。有趣的是，Fargesia spathe进化枝可能起源于Fargesia（sl）中其他进化枝之间的杂交。了解该进化枝的杂种起源需要一个强大的系统发育框架，其中可以解决Fargesia（sl）内的主要进化枝。在这里，我们使用了三个核基因来重建Fargesia（sl ）及其盟友，以识别Fargesia spathe进化枝起源的假定模式，并检查在竹子的种间水平上网状进化发生的程度。巴氏菌属与Fargesia（sl）形成进化枝，进一步分为I组和II组。Fargesia spathe进化枝，高山Bashania进化枝和yajiangensis Fargesia构成第I组，而Bashania fargesii进化枝和其余Fargesia（sl）物种组成II组。当前的基于核的系统发育体和先前的质体系统发育之间的不一致说明了Fargesia（s1）物种和相关类群之间的几种可能的杂交事件，这引起了Fargesia spathe进化枝，Phyllostachys进化枝和Ampelocalamus进化枝。我们还检测到了几种可能的Fargesia（sl）杂种。我们的结果表明，网状进化在Fargesia（sl）进化中发挥了重要作用，这可能部分解释了与Fargesia（sl）和高山竹林相关的分类学困难。该研究还强调了杂交在种间和种内水平上在竹子进化中的重要性。

更新日期：2020-04-17

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