关键词: ph2b突变体, 华山新麦草, BC₂和BC₁F₁衍生后代, 细胞遗传学, 农艺性状

Abstract: Cytological and morphological studies on the BC₂ and BC₁F₁ plants of Triticum aestivum-Psathyrostachys huashanica were carried out in the present paper.The results showed that: ①the somatic chromosome number varied from 2n=42 to 2n=52,and the plants with 2n=45 accounted for 20.27%,while the plants with 2n=51 only 6.6%;②there were a high frequency of univalents in most plants;③trivalents,tetravalents,lagging chromosomes,trinucleate cells,micronuclei,and chromosome bridges could be observed in the plants with more chromosomes;④some plants possess high resistance to wheat stripe rust and wheat scab;⑤all traits in the progenies showed higher variations;⑥some cytological stable plants with 2n=42 or 2n=44 were obtained,which was useful for the production of addition lines,substitution lines or translocation lines of Psathyrostachys huashanica in wheat genetic background.

Key words: ph2b, Psathyrostachys huashanica, BC₂ and BC₁F₁, cytogenetics, morphology