Phylogenetic, evolutionary, and biogeographic origin of the genus Sheathia (Batrachospermales, Rhodophyta)  

作　　者：Jinfen HAN Fangru NAN Jia FENG Junping LÜ Qi LIU Xudong LIU Shulian XIE 

机构地区：[1]School of Life Science,Shanxi Key Laboratory for Research and Development of Regional Plants,Shanxi University,Taiyuan 030006,China

出　　处：《Journal of Oceanology and Limnology》2022年第2期729-744,共16页海洋湖沼学报（英文）

基　　金：Supported by the National Natural Science Foundation of China(Nos.31670208,41871037,31800172);the Fund for Shanxi“1331 Project”。

摘　　要：The genus Sheathia consists of over 20 species primarily distributed in Asia,Europe,Oceania,North America,and Africa.However,the origin and evolution of this genus remain unclear.Two gametophyte stage specimens(SAS18052 and SAS18523)and two“Chantransia”stage specimens(YTS19161 and YTS19017)were collected from Shanxi and Henan Provinces in China,respectively.Based on morphological data,isolates YTS19161 and YTS19017 were similar to Audouinella pygmaea,whereas the morphological characteristics of SAS18052 and SAS18523 were in good agreement with the circumscription description of S.longipedicellata.Molecular sequences of rbc L,COI-5P,and psb A were used to investigate the phylogenetic,evolutionary,and biogeographic origin of the genus Sheathia.The three molecular markers supported that the two gametophyte stage specimens belong to S.longipedicellata,while the isolates YTS19161 and YTS19017 were the“Chantransia”of S.longipedicellata.Ancestral area reconstruction and divergence time estimation speculated that Sheathia originated in North America,a portion of the Pangaea at approximately 328.07-184.73 million years ago(Ma).Our relaxed molecular clock analysis suggests that the Florideophyceae diverged approximately 741.04(894.36-631.70)Ma.The major divergences in this class involved the emergence of Nemaliophycidae[ca.662.01(779.83-580.51)Ma],and the split of orders Batrachospermales and Thoreales[ca.456.10(552.80-367.88)Ma].

关 键 词：divergence time geographic origin molecular analysis MORPHOLOGY phylogenetic relationship 

分 类 号：Q949.2[生物学—植物学]