Divergence in Elymus sibiricus is related to geography and climate oscillation:A new look from pan-chloroplast genome data  

作　　者：Yi Xiong Yan-Li Xiong Xue-Jie Jia Jun-Ming Zhao Li-Jun Yan Li-Na Sha Lin Liu Qing-Qing Yu Xiong Lei Shi-Qie Bai Xiao Ma 

机构地区：[1]College of Grassland Science and Technology,Sichuan Agricultural University,Chengdu,611130 China [2]Sichuan Academy of Grassland Science,Chengdu,611700 China

出　　处：《Journal of Systematics and Evolution》2024年第4期794-808,共15页植物分类学报（英文版）

基　　金：funded by National Natural Science Foundation of China(32271753);Sichuan Province regional innovation cooperation project(2022YFQ0076);Cooperation project of provincial college,and provincial school(2023YFSY0012).

摘　　要：Quaternary glacial climate oscillation and geographical isolation have significantly influenced the geographic distribution pattern and lineage evolution history of species.However,understanding how these factors specifically impact the genealogical structure of dominant Gramineous species in the Qinghai–Tibet Plateau(QTP)remains a subject of investigation.Elymus sibiricus L.(Gramineae),indigenous to the QTP and widely distributed in Eurasia,exhibits remarkable environmental adaptation and phenotypic diversity,making it an ideal candidate for phylogeographic studies.Based on the analysis of 175 complete chloroplast genome sequences,our results indicated that the ancestors of E.sibiricus originated from the QTP and underwent a complex migration history.After the speciation of E.sibiricus,several geo-groups exhibited independent differentiation,showing minimal gene flow among them.The current phylogeographic patterns of E.sibiricus are a result of frequent climate alternations and the cold climate during the Quaternary glacial,as well as the presence of several geographical barriers that have restricted the gene flow among different geo-groups.Our research has revealed for the first time that E.sibiricus has a multilineage origin,and its maternal donors are not limited to a single species.Furthermore,the high quality and mapping depth of the variant file provided reliable data for analyzing the patterns based on raw sequencing data.These findings enhance our understanding of the relationship between plant differentiation and climatic and geographical factors of Eurasia.

关 键 词：Elymus sibiricus EURASIA geographical barrier multilineage origin PHYLOGEOGRAPHY Quaternary glaciation 

分 类 号：Q94[生物学—植物学]