Phylogenomics and evolutionary diversification of the subfamily Polygonoideae  

作　　者：Lu-Shui Zhang Chun-Lin Chen Xing-Xing Mao Jian-Quan Liu 

机构地区：[1]Key Laboratory for Bio-Resources and Eco-Environment of Ministry of Education,College of Life Science&State Key Lab of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610064,China

出　　处：《Journal of Systematics and Evolution》2023年第4期587-598,共12页植物分类学报（英文版）

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(grant XDB31000000);the Second Tibetan Plateau Scientific Expedition and Research(STEP)program(grant 2019QZKK0502)and further by the National Natural Science Foundation of China(grants 31590821 and 91731301);Fundamental Research Funds for the Central Universities(grants YJ201936,SCU2019D013,and 2020SCUNL20).

摘　　要：Many species of the subfamily Polygonoideae are economically important.However,phylogenetic relationships and taxonomic treatments of these species remain disputed.In this study,we used highly orthologous nuclear genes and plastome sequence variation extracted from transcriptomes from 98 species of 26 genera of Polygonaceae mainly from the subfamily Polygonoideae to construct a robust phylogeny.We discerned six successively diverged and well-defined clades and both nuclear and plastome phylogenies are highly consistent with each other in this subfamily.Phylogenetic relationships between all clades and subclades were well resolved within Polygonoideae.Our analyses revealed that the shrub tribe Atraphaxideae and the herbal genera Polygonum,Persicaria,and Fallopia are polyphyletic.The sampled species of Polygonoideae started to diversify around the Cretaceous/Tertiary boundary(70?Ma)when the global climate exhibited large oscillations.Further origins of more herbal and woody species were found to have clearly increased during later climatic oscillations.We found that woody habits,especially shrubs,originated multiple times from ancestral herbs in this subfamily.Local dry climates may have favored such habit shifts from ancestral herbs.Our results deepen our understanding of evolutionary diversification of Polygonoideae.

关 键 词：DIVERSIFICATION PHYLOGENOMICS Polygonoideae woody habit 

分 类 号：Q94[生物学—植物学]