Roegneria is a polyploid perennial genus in the tribe Triticeae. Some species of Roegneria are morphologically similar to genus Elymus and have been classified in Elymus. To investigate the delimitation and phylogenetic relationships of Roegneria, nuclear (ITS, Acc1, and Pgk1) and chloroplast (trnL–trnF) DNA regions were sequenced for 38 allopolyploid species and 32 diploid species of Triticeae. Phylogenetic analyses of nuclear DNA revealed that all Roegneria species were included in the St and Y genome clades, and that the Y genome was closely related to the V and Xp genomes. The chloroplast DNA dataset showed that Roegneria species were grouped with Pseudoroegneria species. The Pseudoroegneria species from the Middle East (P. libanotica and P. tauri) and Central Asia (P. strigosa) were more closely related to Roegneria species. The results suggested that: (i) the species containing the St and Y genomes should be segregated from Elymus and treated as a distinct genus, Roegneria, based on the genomic constitution; (ii) P. libanotica, P. tauri, and/or P. strigosa potentially served as the maternal donor of the St genome in Roegneria; (iii) The Y genome of Roegneria originated from a diploid Y genome species, and the V and Xp genomes may have contributed to Y genome formation; (iv) among Roegneria species of previously uncertain genomic constitution, R. seriotina was tetraploid and possessed the StY genomes, E. calcicolus was hexaploid with the StYH genomic constitution and should be classified in Campeiostachys, R. glaucifolia possessed the StStY genomes, and R. tschimganica had the genomic constitution St₁St₂Y.

中文翻译：

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基于三个核 DNA 序列（ITS、Acc1 和 Pgk1）和一个叶绿体区域（trnL-F）的 Roegneria（小麦科：禾本科）的系统发育关系和母体供体

Roegneria是 Triticeae 部落中的多倍体多年生属。Roegneria的一些物种在形态上与Elymus属相似，并已被归类为Elymus。为研究小麦科的 38 个异源多倍体物种和 32 个二倍体物种的核（ITS、Acc1和Pgk1）和叶绿体（trnL-trnF ）DNA 区域的定界和系统发育关系。核 DNA 的系统发育分析表明，所有Roegneria物种都包含在 St 和 Y 基因组进化枝中，并且 Y 基因组与 V 和 Xp 基因组密切相关。叶绿体 DNA 数据集表明Roegneria物种与Pseudoroegneria物种分组。来自中东（P. libanotica和P. tauri）和中亚（P. strigosa ）的Pseudoroegneria物种与Roegneria物种的关系更密切。结果表明： (i) 应将含有 St 和 Y 基因组的物种从Elymus中分离出来，并根据基因组构成将其视为不同的属Roegneria；(ii) P. libanotica、P. tauri和/或P. strigosa可能作为Roegneria中 St 基因组的母体供体; (iii) Roegneria的 Y 基因组起源于二倍体 Y 基因组物种，V 和 Xp 基因组可能促成了 Y 基因组的形成；(iv) 在先前不确定基因组构成的Roegneria种中，R. seriotina是四倍体并具有 StY 基因组，E. calcicolus是具有 StYH 基因组构成的六倍体，应归类为Campeiostachys，R. glaucifolia具有 StStY 基因组，R . . tschimganica的基因组构成为 St ₁ St ₂ Y。