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Genome constitution of Elymus tangutorum (Poaceae: Triticeae) inferred from meiotic pairing behavior and genomic in situ hybridization
Author(s) -
Yang CaiRong,
Zhang HaiQin,
Zhao FuQiang,
Liu XiaoYan,
Fan Xing,
Sha LiNa,
Kang HouYang,
Wang Yi,
Zhou YongHong
Publication year - 2015
Publication title -
journal of systematics and evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.249
H-Index - 46
eISSN - 1759-6831
pISSN - 1674-4918
DOI - 10.1111/jse.12155
Subject(s) - triticeae , biology , elymus , botany , meiosis , genome , perennial plant , genetics , poaceae , gene
Abstract Elymus tangutorum (Nevski) Hand.‐Mazz (2 n = 6 x = 42) is a perennial species in the tribe Triticeae, which distributes in Nepal and north and northwest China. However, the genome constitution of E. tangutorum is controversial and its taxonomic status is not clear. Hybridizations of E. tangutorum were carried out with E. wawawaiensis J. R. Carlson & Barkworth ( StH ), Roegneria grandis Keng ( StY ), and E. dahuricus Turcz. ex Griseb. ( StYH ). Meiotic pairing in the hybrids E. tangutorum × E. wawawaiensis ( StH ), E. tangutorum × R. grandis ( StY ), and E. tangutorum × E. dahuricus ( StYH ) averaged 10.48, 11.12, and 20.92 bivalents per cell, respectively. The results suggested that E. tangutorum is an allohexaploid and contains the StYH genomes. Results of genomic in situ hybridization analysis strongly supported the chromosome pairing data. Therefore, E. tangutorum should be treated as Campeiostachys dahurica var. tangutorum (Nevski) B. R. Baum, J. L. Yang & C. Yen. Intergenomic rearrangements of E. tangutorum may be affected by environmental factors.