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A comparative study was made of the sequence of the  GBSS1  gene fragment in accessions of closely related species  Elymus margaritae, E. komarovii , and  E. transbaicalensis  from Siberia. Nucleotide sequences of the gene were determined for St subgenomes in accessions of  E. margaritae  and  E. komarovii  from classical habitats. The StH-genomic constitution was confirmed, and microevolutionary relationships between species were evaluated by constructing the NJ dendrogram. It was shown that variants of the St subgenomes in accessions  E. margaritae  GUK-1009 and  E. komarovii  AUK-9803 belong to the North American ancestral line St 2  of the genus  Pseudoroegneria , in contrast to accessions  E. margaritae  AUK-0650 and  E. komarovii  GAR-0501. The latter belong to the Asian branch of St 1 , together with variants of subgenomes in the species  E. gmelinii  and  E. pendulinus.  That is, according to the differentiation levels of the St subgenome, accession  E. margaritae  GUK-1009 (holotype) is significantly distanted from the accession AUK-0650 (paratype), which in turn is close to accessions of  E. komarovii  and  E. transbaicalensis  from East Sayan. According to levels of differentiation of the H subgenome, the studied species did not show noticeable differences.

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The version of microevolutionary relationships between the Siberian species Elymus margaritae, E. komarovii, and E. transbaicalensis (Poaceae) according to sequencing of the nuclear gene GBSS1 (waxy)