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According to descriptions, the Siberian species   E. peschkovae   and   E. confusus   differ in the presence or absence of trichomes on lemma and rachilla surfaces only. Two methods were used for study microevolutionary relationships between these species: hybridization of biotypes from different locations and analysis of nucleotide sequences of the low-copy nuclear gene  GBSS1 . Created and grown hybrids in combinations  AMU-8804 × BER-0807  and  AMU-8804 × BUK-1109  showed complete seed sterility in two field vegetations. Taking into account wide species areas, 3 hybrids were created between Magadan biotypes from a common habitat in the combination   E. confusus  MOL1887 ×  E. peschkovae  MOL-1882 . The plants showed seed fertility (SF) of 0–3 %. This result does not obscure the possibility to assess SF in the F 2  generation and the character of inheritance of diagnostic traits. A comparative study of the  GBSS1  gene sequences in accessions was carried out in comparison with clones of reference species. Differentiation of clones by the  St 2   subgenome in   E. confusus, E. peschkovae, E. sibiricus   and   E. caninus   did not reveal a clear relationships between the species. Meanwhile, a certain species specificity for the  H 1   subgenome was noted, confirming the existence of microevolutionary isolation of these species.

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Microevolutionary relationships between biotypes of Elymus confusus, E. peschkovae, and E. sibiricus (Poaceae) according to hybridization and sequencing of the nuclear gene GBSS1 (waxy)