Differentiation of the StHY-genomic Elymus dahuricus Complex (Triticeae: Poaceae), Revealed with the Use of SDS-Electrophoresis of Storage Seed Proteins and the AFLP Analysis
E. P. SAVCHKOVA, L. G. BAILEY, B. R. BAUM, A. V. AGAFONOV
Pages: 33-42
Abstract
The status of the taxa Elymus dahuricus Turcz. ex Griseb.,E. excelsus Turcz. ex Griseb., E. woroschilowii Probat. and E. tangutorum (Nevski) Hand.-Mazz. in the StHY-genomic complex of E. dahuricus, has been investigated using morphological, biochemical (SDS-PAGE of endosperm proteins) and molecular (AFLP) variation characteristics. The materials include populations and separate accessions from Siberia, Far East (Russia), Tien-Shan (Kirghizstan), Tibetan and Sichuan Provinces (China). Variation of morphological characteristics and endosperm proteins patterns have been found in all populations of the complex. The same components of electrophoretic spectra were revealed for accessions of different taxonomic species. That is probably an evidence of the population variability with respect to species diagnostic characters. Differences in the variation obtained by means of DNA-AFLPs were revealed between studied biotypes. On the whole, genetic variability of investigated characters does not reflect the taxonomic status of studied species. The E. dahuricus complex seems to be a species having a wide geographical range with a wide morphological and biochemical variation. The different species need probably be relegated to infraspecific rank.
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