Genomic constitution and taxonomy of the Chinese hexaploids Elymus cylindricus and E. breviaristatus (Poaceae: Triticeae)

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• 作者：Cai-Rong Yang ; Bernard-R. Baum ; Wei-Huan Chen ; Hai-Qin Zhang ; Xiao-Yan Liu ; Xing Fan ; Li-Na Sha ; Hou-Yang Kang ; Yi Wang and Yong-Hong Zhou
• 刊名：Botanical Journal of the Linnean Society
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：182
• 期：3
• 页码：650-657
• 全文大小：534K
• ISSN：1095-8339

文摘

Elymus cylindricus (2n = 6x = 42) and E. breviaristatus (2n = 6x = 42) are distributed in grasslands and deserts of northern and north-western China. Their genomic constitution and taxonomic status are unclear. Elymus cylindricus was crossed with E. wawawaiensis J.R.Carlson & Barkworth (StH), Roegneria grandis Keng (StY) and Campeiostachys dahurica (Turcz. ex Griseb.) B.R.Baum, J.L.Yang & C.Yen var. dahurica (StYH). Meiotic pairing in the hybrids E. cylindricus × E. wawawaiensis (StH), E. cylindricus × R. grandis (StY) and E. cylindricus × C. dahurica var. dahurica (StYH) showed on average 10.00, 11.30 and 20.92 bivalents per cell, respectively. Elymus breviaristatus was crossed with C. dahurica var. dahurica (StYH) and E. cylindricus. Chromosome pairing in the hybrids of E. breviaristatus × C. dahurica var. dahurica and E. breviaristatus × E. cylindricus showed on average 19.60 and 19.27 bivalents, respectively. Genomic in situ hybridization (GISH) revealed the presence of St, Y and H genomes in E. cylindricus and E. breviaristatus. An intergenomic rearrangement was observed in E. cylindricus using GISH. Meiotic pairing data and GISH indicated that both E. cylindricus and E. breviaristatus are allohexaploids containing the StYH genomes. Elymus cylindricus and E. breviaristatus should be treated as Campeiostachys dahurica var. cylindrica and Campeiostachys breviaristata, respectively.