基于叶绿体trnL-F序列对广义披碱草属物种的系统进化研究

广义披碱草属包括了披碱草属、鹅观草属、猬草属、裂颖草属和仲彬草属.为深入研究这5个小麦族多年生属的系统地位、母本来源及St染色体组的来源和分化等问题,本研究根据叶绿体DNA trnL-F序列构建了系统树和网状结构图.结果表明,1)广义披碱草属物种的母本不完全来源于拟鹅观草属的St染色体组,其中黑药仲彬草和梭罗仲彬草的母...

Phylogeny of Elymus sensu lato in Triticeae (Poaceae) based on plastid trnL-F sequence data

The genus Elymus sensu lato includes Roegneria,Elymus,Hystrix,Sitanion,and Kengyilia.The plastid trnL-F sequence data were analyzed for their phylogenetic relationships,maternal donor,and for the origin and differentiation of St genomes by using Maximum Parsimony(MP) and Median Joining algorithm(MJ) methods.1) The maternal donor of Elymus sensu lato was not always Pseudoroegneria.The P genome served as the maternal donor to Kengyilia melanthera and K.thoroldiana,while the Ns genome was the maternal donor for Hystrix duthiei and H.duthiei ssp.longearistata;2) The MP tree revealed the close relationships between P,W and St genomes,while the H and Ns genomes were distinctly related to them;3) K.melanthera and K.thoroldiana were clustered with diploid Agropyron species,which indicated the close relationships among them.H.patula was clustered in the St clade,while H.duthiei and H.duthiei ssp.longearistata were grouped in the Ns clade.The genomic constitution of H.patula was different from H.duthiei and H.duthiei ssp.longearistata;4) The five diploid species with St genome did not form the monophyletic clades,suggesting the differentiation of the diploid species.The polyploid species with St genome were not clustered together,suggesting the differentiation of St genomes in polyploids;5) The species distributed in Eurasia might originate from the diploid species of Pseudoroegneria from Asia,while the North American species might originate from North America Pseudoroegneria species.Some species might have a multiple origin and experienced recurrent hybridization between species with different genomes.