基于叶绿体atpB-rbcL序列探讨猬草属和赖草属植物的系统发育和母系起源

对小麦族猬草属、赖草属(NsXm)、披碱草属(StH)及含不同染色体组(St、H、Ns、E^b、E^e、P、F 、V、W)的近缘二倍体属共46个类群的叶绿体基因间隔区atpB-rbcL序列进行系统发育分析,探讨猬草属和赖草属植物系统发育关系及母系起源。结果显示,1)猬草属模式种H. patula与拟鹅观草属和披碱草属物种聚为一支,表明H. patula与披碱草属植物亲缘关系近,其母本来源为含St染色体组的拟鹅观草属物种;2)猬草、长芒猬草、4个新麦草属物种及滨麦和所有欧亚分布的赖草属物种聚在一支,说明猬草、长芒猬草与欧亚赖草亲缘关系较近,其母本供体来自含Ns染色体组的新麦草属物种;3)高丽猬草和东北猬草与北美赖草及冰草属、旱麦草属、大麦属物种处于同一分支,表明高丽猬草和东北猬草与北美赖草具有较近亲缘关系,其母本供体为未知来源的Xm染色体组。研究结果支持将H. patula组合到披碱草属中,猬草、长芒猬草、高丽猬草和东北猬草应组合到赖草属中。

Phylogenetic relationships and maternal donor of Hystrix and Leymus species as revealed by chloroplast atpB-rbcL sequences

The phylogenetic relationships and maternal donor of species in the genera Hystrix and Leymus were investigated by analysing the chloroplast atpB-rbcL sequences for five taxa of Hystrix, 22 species of Leymus (NsXm), together with two species of Elymus (StH) and 17 related diploid species from 8 genera. Maximum Parsimony (MP) and Bayesian Inference (BI) were used for phylogenetic analysis. 1) H. patula was closely related to Elymus, and the maternal donor of H. patula was the St genome; 2) H. duthiei and H. duthiei ssp. longearistata were closely related to the Eurasia Leymus, and the maternal donors of them were the Ns genome from Psathyrostachys; 3) H. coreana and H. komarovii were closely related to the Leymus species in North America, and their maternal donors could be the Xm genome. Thus, it is reasonable to transfer H. patula from Hystrix to Elymus, and to combine H. duthiei, H. duthiei ssp. longearistata, H. coreana, and H. komarovii into Leymus.