Fig. 1 Neighbor-joining phylogenetic tree for ndhF DNA sequences. Poa pratensis, Avena sativa, and Piptatherum racemosum served as outgroups. Numbers at the branch points give the bootstrap confidence values for 500 replications. Values greater than 90 indicate statistically significant groupings of accessions at that branch node (Kumar et al., 1993). Genetic distances calculated according to Jukes and Cantor (1969)

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