Genome constitution of Elymus tangutorum （Poaceae： Triticeae）inferred from meiotic pairing behavior and genomic in situ hybridization

Elymus tangutorum （Nevski） Hand.-Mazz （2n = 6x = 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...

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Published in植物分类学报：英文版 no. 6; pp. 529 - 534
Main Author Cai-Rong Yang Hai-qin Zhang Fu-qiang Zhao Xiao-Yan Liu Xing Fan Li-Na Sha Hou-Yang Kang Yi Wang Yong-Hong Zhou
Format Journal Article
LanguageEnglish
Published 2015
Subjects
减数分裂
基因组原位杂交
小麦族
白刺
禾本科
空心莲子草
组成
配对行为
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Summary:Elymus tangutorum （Nevski） Hand.-Mazz （2n = 6x = 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）, Roegnerio grondis Keng （.STY）, and E. dohuricus Turcz. ex Griseb. （.StYH）. Meiotic pairing in the hybrids E. tangutorum × E. wawawaiensis （StH）, E. tongutorurn × R. grandis （STY）, and E. tangutorurn × E. dahuricus （StYli） averaged 10.48, 11.12, and 20.92 bivalents per cell, respectively. The results suggested that E. tangutorum is an allohexaploid and contains the StYli genomes. Results of genomic in situ hybridization analysis strongly supported the chromosome pairing data. Therefore, E. tangutorum should be treated as Compeiostochys dahurica var. tangutorum （Nevski） B. R. Baum, J. L. Yang ＆ C. Yen. Intergenomic rearrangements of E. tangutorum may be affected by environmental factors.
Bibliography:Elymus tangutorum （Nevski） Hand.-Mazz （2n = 6x = 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）, Roegnerio grondis Keng （.STY）, and E. dohuricus Turcz. ex Griseb. （.StYH）. Meiotic pairing in the hybrids E. tangutorum × E. wawawaiensis （StH）, E. tongutorurn × R. grandis （STY）, and E. tangutorurn × E. dahuricus （StYli） averaged 10.48, 11.12, and 20.92 bivalents per cell, respectively. The results suggested that E. tangutorum is an allohexaploid and contains the StYli genomes. Results of genomic in situ hybridization analysis strongly supported the chromosome pairing data. Therefore, E. tangutorum should be treated as Compeiostochys dahurica var. tangutorum （Nevski） B. R. Baum, J. L. Yang ＆ C. Yen. Intergenomic rearrangements of E. tangutorum may be affected by environmental factors.
chromosome pairing, E. tangutorum, genome, hybrid, intergenomic rearrangements, meiosis.
11-5779/Q
ISSN:1674-4918
1759-6831