J Syst Evol ›› 2015, Vol. 53 ›› Issue (6): 529-534.DOI: 10.1111/jse.12155

• Research Articles • Previous Articles     Next Articles

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

Cai-Rong Yang1, Hai-Qin Zhang1,2, Fu-Qiang Zhao1, Xiao-Yan Liu1, Xing Fan1,2, Li-Na Sha1,2, Hou-Yang Kang1,2, Yi Wang1,2, and Yong-Hong Zhou1,2*   

  1. 1Triticeae Research Institute, Sichuan Agricultural University, Wenjiang, Sichuan, China
    2Key Laboratory of Crop Genetic Resources and Improvement, Ministry of Education, Sichuan Agricultural University, Ya'an, Sichuan, China
  • Received:2015-03-09 Published:2015-05-25

Abstract: 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), 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.

Key words: chromosome pairing, E. tangutorum, genome, hybrid, intergenomic rearrangements, meiosis