Population genetics and evolutionary history of Miscanthus species in China
作 者：Li SS, Zhou HF, Chen WL, Yan J, Cai Z, Wei RX, Chen CH, Han B, Li JQ, Sang T, Ge S*
影响因子:4.04
刊物名称:Journal of Systematics and Evolution
出版年份:2019
卷:期: 页码:DOI:10.1111/jse.12497
文章摘要:Miscanthusspecies have received considerable attention as a potential biomass source for renewable energy production because of their ability to produce high yields of biomass and adapt to a wide range of climates and soils. To explore the genetic diversity and phylogenetic relationship ofMiscanthusspecies in China, we used 24 simple sequence repeat markers to genotype 100 natural populations representing all four ChineseMiscanthusspecies (M.sinensisAndersson,M. floridulus(Lab.) Warb. ex K. Schum. & Lauterb.,M. sacchariflorus(Maxim.) Hack., andM. lutarioripariusL. Liu ex Renvoize & S. L. Chen). Based on phylogenetic, principal coordinate, andStructureanalyses, we found that the 100 populations formed two major groups corresponding to sect.Triarrhenaand sect.Miscanthus. Group 1 (i.e., sect.Triarrhena) was further subdivided into two subgroups corresponding toM.sacchariflorusandM. lutarioriparius; Group 2 (i.e., sect.Miscanthus) was subdivided into three subgroups, group 2a (M.sinensispopulations in southern China), group 2b (M.sinensispopulations in northern China), and group 2c (all theM.floriduluspopulations). Population genetics analyses indicated high levels of the genetic diversity at both population (H_E= 0.468–0.599) and species (H_E= 0.559–0.708) levels, indicative of the potential of these wild resources in future breeding programs. The species distribution modeling showed thatM. sacchariflorusandM. lutarioripariushave experienced population reductions during the last glacial maximum and population expansion afterward; in contrast,M. sinensisandM. floridulusboth underwent gradual population expansions from the last interglaciation to the present. We also suggest thatM. floridulusoriginated fromM. sinensisin southeast China through ecological speciation. The understanding of the evolutionary history and population dynamics of these species not only provides valuable information for further genetic improvement and breeding of this energy crop but also gives important insights into the origin and speciation processes of theMiscanthusspecies.