Title：
Phylogenomics of the aquatic plant genus Ottelia (Hydrocharitaceae): Implications for historical biogeography
Authors：
Corresponding
Author：
Li ZhiZhong， Lehtonen Samuli Martins Karina， Gichira Andrew W， Wu Shuang， Li Wei， Hu GuangWan， Liu Yan， Zou ChunYu， Wang QingFeng， Chen JinMing*
Pubyear：
2020
Title of
Journal：
Molecular Phylogenetics and Evolution
Paper
Code：
Volume：
152
Number：
Page：
106939
Others：
Classification：
Source：
Abstract：
Ottelia Pers. 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. Ottelia has 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 for Ottelia using 40 newly assembled complete plastomes. Our results resolved Ottelia as 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 group Ottelia began to diversify around 13.09Ma 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 of Ottelia, 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 of Ottelia in China.
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