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GrainGenes Reference Report: SYS-26-757

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Reference	SYS-26-757
Title	Origin of North American Elymus (Poaceae : Triticeae) allotetraploids based on granule-bound starch synthase gene sequences
Journal	Systematic Botany
Year	2001
Volume	26
Pages	757-768
Author	Mason-Gamer RJ
Abstract	Summary: The current circumscription of Elymus based on cytogenetic analyses includes all allopolyploid Triticeae species containing the St (Pseudoroegneria) genome. In North American Elymus, the St genome is combined with H (from Hordeum) in an allotetraploid (StStHH) configuration. The goal of this study is to determine whether molecular phylogenetic analyses support existing cytogenetic data with regard to the evolutionary origin of North American Elymus. Analyses were performed using sequences from the nuclear starch synthase gene, and include multiple species of Elymus, Pseudoroegneria, and Hordeum, along with representatives of most of the other monogenomic genera in the Triticeae. The results support the hypothesis that Pseudoroegneria and Hordeum are the genome donors to the North American Elymus tetraploids. One species currently placed in Elymus (an octoploid, Elymus californicus) appears to be unrelated to the rest. The close relationships among Elymus H-genome sequences, with one exception, are consistent with a single origin of the group. The St-genome group consists of two well-defined clades, but support for the monophyly of the entire St group is weak. There are shortcomings associated with the current dependence on genome pairing data for grouping and ranking in the Triticeae, but molecular phylogenetic data suggest that, in many cases, groups delimited by cytogenetic data do in fact correspond to evolutionary lineages
Keyword	[ Hide all but 1 of 43 ] allopolyploid allotetraploids american combinations dna-sequences elymus evolutionary gene gene sequence genera genome genome donor gramineae granule bound starch synthase granule-bound starch synthase group-i groups h genome hordeum hypothesis identification likelihood molecular multiple nuclear nucleotide-sequences octoploid origin pairing perennial triticeae phylogenetic analysis poaceae relationships sequence single species st genome starch starch synthase synthase tetraploid triticeae waxy locus

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