Phylogenomics of the aquatic plant genus Ottelia (Hydrocharitaceae): Implications for historical biogeography
Phylogenomics of the aquatic plant genus Ottelia (Hydrocharitaceae): Implications for historical biogeography
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水生植物 Ottelia 属（Hydrocharitaceae）的系统发育组学：对历史生物地理学的启示
DOI：
10.1016/j.ympev.2020.106939
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发表时间：
2020-11-01
影响因子：
4.1
通讯作者：
Chen，Jin-Ming
中科院分区：
文献类型：
--
作者：
Li，Zhi-Zhong;Lehtonen，Samuli;Chen，Jin-Ming
奥特莉亚·珀斯是水鳖科第二大属，包括约 23 个现存物种。该属表现出两性和单性花的多样性，以及包括异花授粉到闭锁花的复杂生殖系统。Ottelia被认为是研究水鳅科进化的关键类群，但该属的系统发育关系和进化历史仍未解决。在这里，我们使用 40 个新组装的完整质体为 Ottelia 重建了一个强大的系统发育框架。我们的结果将奥特利亚属视为一个由两个主要分支组成的单系属，分别对应于亚洲和非洲的两个主要多样性中心。根据分歧时间估计分析，冠群Ottelia在中中新世13.09 Ma左右开始分化。生物地理学分析表明，最近的共同祖先存在于非洲/澳大利亚/亚洲的某个地方。基于对奥特利亚形态演化的进一步认识，我们推测其祖先起源中心在非洲，并从那里跨洋扩散到南美洲和澳大利亚，并进一步从澳大利亚扩展到亚洲。我们认为，中新世中期以来的气候变化和全球变冷，例如东亚季风气候的发展和云贵高原的构造运动，可能对中国奥特利亚的演化起到了至关重要的作用。
OtteliaPers. is the second largest genus of the family Hydrocharitaceae, including approximately 23 extant species. The genus exhibits a diversity of both bisexual and unisexual flowers, and complex reproductive system comprising cross-pollinated to cleistogamous flowers.Otteliahas been regarded as a pivotal group to study the evolution of Hydrocharitaceae, but the phylogenic relationships and evolutionary history of the genus remain unresolved. Here, we reconstructed a robust phylogenetic framework forOtteliausing 40 newly assembled complete plastomes. Our results resolvedOtteliaas a monophyletic genus consisting of two major clades, which correspond to the main two centers of diversity in Asia and Africa. According to the divergence time estimation analysis, the crown groupOtteliabegan to diversify around 13.09 Ma during the middle Miocene. The biogeographical analysis indicated the existence of the most recent common ancestor somewhere in Africa/Australasia/Asia. Basing on further insights from the morphological evolution ofOttelia, we hypothesized that the ancestral center of origin was in Africa, from where the range expanded by transoceanic dispersal to South America and Australasia, and further from Australasia to Asia. We suggested that the climatic change and global cooling since the mid-Miocene, such as the development of East Asian monsoon climate and tectonic movement of the Yunnan-Guizhou Plateau (YGP), might have played a crucial role in the evolution ofOtteliain China.