Phylogenomics and phylogeography of Menispermum (Menispermaceae)

作者：Shiqiang Song, Kenneth M. Cameron, Yuguo Wang, Shenyi Wang, Xinjie Jin, Faiza Hina, Zhaoping Yang, Pan Li · 发表于：Frontiers in Plant Science · 年份：2023 · DOI：10.3389/fpls.2023.1116300 · 被引用次数：5 · 研究领域：Plant Diversity and Evolution、Plant Taxonomy and Phylogenetics、Plant and Fungal Species Descriptions

Introduction Phylogenomics have been widely used to resolve ambiguous and controversial evolutionary relationships among plant species and genera, and the identification of unique indels in plastomes may even help to understand the evolution of some plant families. Menispermum L. (Menispermaceae) consists of three species, M. dauricum DC., M. canadense L., and M. mexicanum Rose, which are disjuncly distributed among East Asia, Eastern North America and Mexico. Taxonomists continue to debate whether M. mexicanum is a distinct species, a variety of M. dauricum , or simply a synonym of M. canadense . To date, no molecular systematics studies have included this doubtful species in phylogenetic analyses. Methods In this study, we examined phylogenomics and phylogeography of Menispermum across its entire range using 29 whole plastomes of Menispermaceae and 18 ITS1&ITS2 sequences of Menispermeae. We reconstructed interspecific relationships of Menispermum and explored plastome evolution in Menispermaceae, revealing several genomic hotspot regions for the family. Results and discussion Phylogenetic and network analyses based on whole plastome and ITS1&ITS2 sequences show that Menispermum clusters into two clades with high support values, Clade A ( M. dauricum ) and Clade B ( M. canadense + M. mexicanum ). However, M. mexicanum is nested within M. canadense and, as a result, we support that M. mexicanum is a synonym of M. canadense . We also identified important molecu...