title: Phylogenetic relationships in Leymus (Poaceae: Triticeae) revealed by the nuclear ribosomal internal transcribed spacer and chloroplast trnL-F sequences.
abstract: Using the nuclear ribosomal internal transcribed spacer (ITS) sequences and the chloroplasttrnL-F sequence, phylogeneic analysis was performed on 57 accessions of species in the tribe Triticeae including 13 Leymus species (N(s)) with different ploidy levels and 40 diploid species from 18 genera. The ITS sequences revealed that ployploid Leymus has close phylogentic relationships with Psathyrostachys and an undefined genus in Triticeae. The trnL-F tree demonstrated close relationships between certain Leymus species and Psathyrostachys, and other Leymus species distributed in North America were far from Psathyrostachys. Based on these results, it is unlikely that the unknown genome in Leymus species originated from one of the sampled diploid species in the present study. The maternal donor of all the Leymus species with a natural distribution in Eurasia were N(s) genome. Furthermore, Elymus californicus should be transferred from the genus Elymus to Leymus.
authors.affiliation: Key Laboratory of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China.
authors.forename: Zhipeng
authors.initials: Z
authors.lastname: Liu
authors.forename: Zhongyue
authors.initials: Z
authors.lastname: Chen
authors.forename: Jin
authors.initials: J
authors.lastname: Pan
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Li
authors.forename: Man
authors.initials: M
authors.lastname: Su
authors.forename: Lijuan
authors.initials: L
authors.lastname: Wang
authors.forename: Hongjie
authors.initials: H
authors.lastname: Li
authors.forename: Gongshe
authors.initials: G
authors.lastname: Liu
mesh_terms: D002467:Cell Nucleus / Q000235:genetics; D018742:DNA, Chloroplast / Q000737:chemistry / Q000235:genetics; D021903:DNA, Ribosomal Spacer / Q000737:chemistry / Q000235:genetics; D031749:Elymus / Q000145:classification* / Q000235:genetics; D020459:Genes, rRNA / Q000235:genetics; D018745:Genome, Plant / Q000235:genetics; D010802:Phylogeny; D006109:Poaceae / Q000145:classification* / Q000235:genetics; D018807:Polymorphism, Single-Stranded Conformational; D017422:Sequence Analysis, DNA; D014158:Transcription, Genetic
chemical_list: D018742:DNA, Chloroplast; D021903:DNA, Ribosomal Spacer