Abstract: Kengyilia melanthera (Keng)J. L. Yang, Yen et Baum and K. kokonorica (Keng)J. L. Yang, Yen et Baum are two hexaploid perennial grasses of the tribe Triticeae native in west China. K. melanthera and K. kokonorica were hybridized with Roegneria kamoji Ohwi(2n=42,StStHHYY) and K. hirsuta (Keng)J. L. Yang, Yen et Baum (2n = 42, PPStStYY) respectively. Chromosome pairing behaviour at metaphase I in the par- ents and hybrids was studied. Meiotic configurations were 18.20 Ⅰ + 11.74 Ⅱ + 0.09 Ⅲ  + 0.01V for R. kamoji×K. melanthera, 1.06Ⅰ + 20.47 Ⅱ for K. hirsuta×K. melanthera, 19.36Ⅰ + 11.26 Ⅱ + 0.04Ⅲ for R. kamoji×K. kokonorica, and2.46Ⅰ  + 19.44Ⅱ + 0.14 Ⅲ + 0.06 Ⅳ for K. hirsuta×K. kokonorica. Considering chromo- some pairing in the hybrids, as well as morphological characters, K. melanthera and K. kokonorica should be grouped in Kengyilia Yen et J. L. Yang instead of being keeped inRoegneria sect. Paragropyron Keng , or in Elymus L. or Elytrigia Desv.

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