Phylogeny and biogeography of Maianthemum(Asparagaceae:Nolinoideae)revisited with emphasis on its divergence pattern in SW China  

作　　者：Ran Meng Ying Meng Yong-Ping Yang Ze-Long Nie 

机构地区：[1]Key Laboratory of Plant Resources Conservation and Utilization,College of Biological Resources and Environmental Sciences,Jishou University,Jishou 416000,Hunan,China [2]Xishuangbanna Tropical Botanical Garden,Chinese Academy of Sciences,Mengla 666303,Yunnan,China [3]Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,Yunnan,China

出　　处：《Plant Diversity》2021年第2期93-101,共9页植物多样性（英文版）

基　　金：This study was supported by grants from Natural Sciences Foundation of China(31760055);Natural Sciences Foundation of Hunan Province(2019JJ40232 and 2019JJ40233);Comprehensive Scientific Investigation of Biodiversity from the Wuling Mountains(2014FY110100);the Hunan Provincial Innovation Foundation for Postgraduate(CX2018B724);the John D.and Catherine T.MacArthur Foundation.

摘　　要：Maianthemum is a genus with more than 35 species from the tribe Polygonateae(Asparagaceae),widely distributed between North to Central Americas and eastern Asia with high diversity in the easternHimalayas to the Hengduan Mountains of SW China.Although most species from SW China form a well-supported clade,phylogenetic relationships within this clade remain unclear.With a broad level of taxon sampling and an extensive character sampling fromeight DNA regions,this study intends to revisit the phylogeny and biogeography of the genus to better understand the divergence patterns of species from SW China.Phylogenetic results suggested the monophyly of Maianthemum with recognition of nine strongly supported clades,but backbone relationships among these clades remained largely uncertain.For the SWChina clade,individuals from the same species are grouped into different lineages.Our results revealed that the fast radiation of the SWChina cladewas occurred in the eastern Himalayas,followed by subsequent radiation in the Hengduan Mountains in the Pliocene.Intercontinental disjunctions of Maianthemum in the Northern Hemisphere appear to have occurred multiple times during the late Miocene to the Pliocene,likely resulted by a combination of both vicariance and long-distance dispersal events.

关 键 词：BIOGEOGRAPHY Eastern Asia Hengduan mountains Intercontinental disjunction Maianthemum North America 

分 类 号：Q949[生物学—植物学]