Roegneria alashanica Keng: a species with the StStStYStYgenome constitution.
The genome constitution of tetraploid Roegneria alashanica Keng has been in question for a long time. Most scientific studies have suggested that R. alashanica had two versions of the St genome, St1St2, similar to that of Pseudoroegneria elytrigioides (C. Yen & J.L. Yang) B.R. Lu. A study, however, concluded that R. alashanica had the StY genome formula typical for tetraploid species of Roegneria. For the present study, R. alashanica, Elymus longearistatus (Bioss.) Tzvelev (StY genomes), Pseudoroegneria strigosa (M. Bieb.) Á. Löve (St), Pseudoroegneria libanoctica (Hackel) D.R. Dewey (St), and Pseudoroegneria spicata (Pursh) Á. Löve (St) were screened for the Y-genome specific marker B14(F+R)269. All E. longearistatus plants expressed intense bands specific to the Y genome. Only 6 of 10 R. alashanica plants exhibited relatively faint bands for the STS marker. Previously, the genome in species of Pseudoroegneria exhibiting such faint Y-genome specific marker was designated as StY. Based on these results, R. alashanica lacks the Y genome in E. longearistatus but likely possess two remotely related St genomes, St and StY. According to its genome constitution, R. alashanica should be classified in the genus Pseudoroenera and given the new name Pseudoroegneria alashanica (Keng) R.R.-C. Wang and K.B. Jensen.
United States Department of Agriculture - Agricultural Research Services, Forage and Range Research Laboratory, Logan, UT 84322-6300, USA.|United States Department of Agriculture - Agricultural Research Services, Forage and Range Research Laboratory, Logan, UT 84322-6300, USA.
Richard R-C
RR
Wang
United States Department of Agriculture - Agricultural Research Services, Forage and Range Research Laboratory, Logan, UT 84322-6300, USA.|United States Department of Agriculture - Agricultural Research Services, Forage and Range Research Laboratory, Logan, UT 84322-6300, USA.
Kevin B
KB
Jensen
D018742:DNA, Chloroplast / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics; D031749:Elymus / Q000235:genetics*; D019143:Evolution, Molecular; D018745:Genome, Plant / Q000235:genetics*; D010802:Phylogeny; D017422:Sequence Analysis, DNA / Q000379:methods; D057891:Tetraploidy
D018742:DNA, Chloroplast; D018744:DNA, Plant
Pseudoroegneria; Triticeae; nomenclature; taxonomie; taxonomy