Phylogenetic relationships in Elymus (Poaceae: Triticeae) based on the nuclear ribosomal internal transcribed spacer and chloroplast trnL-F sequences

• Published in: The New phytologist 2006-04, Vol.170 (2), p.411-420
• Main Authors: Liu, Quanlan, Ge, Song, Tang, Haibao, Zhang, Xianglin, Zhu, Genfeng, Lu, Bao-Rong
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Agropyron; Biological and medical sciences; Biological taxonomies; chloroplast DNA; chloroplast trnL‐F; Diploidy; DNA, Chloroplast - classification; DNA, Ribosomal Spacer - classification; Elymus; Elymus - classification; Elymus - genetics; Evolution; Fundamental and applied biological sciences. Psychology; Generalities. Genetics. Plant material; Genetic Variation; Genetics and breeding of economic plants; Genome, Plant; Genomes; genomic differentiation; Genomics; Hordeum; hybridization; Internal transcribed spacers; molecular systematics; nuclear ribosomal internal transcribed spacer (ITS); Phylogenetics; Phylogeny; Plant cytology, morphology, systematics, chorology and evolution; Plant material; Poaceae; Poaceae - classification; Poaceae - genetics; polyploidization; Polyploidy; ribosomal DNA; Sequence Analysis, DNA; Spermatophyta; Systematics (diagnosis, chromosome numbers); Taxonomy; Tetraploidy; Triticeae
• ISSN: 0028-646X; 1469-8137
• DOI: 10.1111/j.1469-8137.2006.01665.x

• To estimate the phylogenetic relationship of polyploid Elymus in Triticeae, nuclear ribosomal internal transcribed spacer (ITS) and chloroplast trnL-F sequences of 45 Elymus accessions containing various genomes were analysed with those of five Pseudoroegneria (St), two Hordeum (H), three Agropyron (P) and two Australopyrum (W) accessions. • The ITS sequences revealed a close phylogenetic relationship between the polyploid Elymus and species from the other genera. The ITS and trnL-F trees indicated considerable differentiation of the StY genome species. • The trnL-F sequences revealed an especially close relationship of Pseudoroegneria to all Elymus species included. Both the ITS and trnL-F trees suggested multiple origins and recurrent hybridization of Elymus species. • The results suggested that: the St, H, P, and W genomes in polyploid Elymus were donated by Pseudoroegneria, Hordeum, Agropyron and Australopyrum, respectively, and the St and Y genomes may have originated from the same ancestor; Pseudor-oegneria was the maternal donor of the polyploid Elymus; and some Elymus species showed multiple origin and experienced recurrent hybridization.