关键词: 水稻, 腋芽, 越冬性, 农艺性状, 遗传变异

Abstract: The heritabilities of the overwintering ability of axillary buds were analyzed using four hybrid rice combinations, which derived from a new gramplasm resource of perennial waxy rice Nuodao 89-1 crossed with 4 different rice genotypes, and the genetic variation of main agronomic traits in F₂ generation was also investigated among the three combinations. The highest heritabilities of 1000-grain weight and plant height were in main crop season, whereas the lowest were in overwintering season,and grain number per panicle and seed setting rate reached peak in ratooning season. The averages of grain number per panicle,1000-grain weight,plant height and panicle length in F₂ approached to those in F₁ with a nearly normal distribution,indicating there was no gametic selection from F₁ to F₂ generation.The variation range and coefficient were greater in main crop season and overwintering season. Though the average seed setting rate was higher in F₂ generation than in F₁ generation,the highest was in ratooning season, and the seed setting rate presented bimodal distribution,indicating gametic selection did exist from F₁ to F₂ generation, and result was in favor of gametes with a high seed setting rate.

Key words: rice, axillary buds, overwintering ability, agronomic traits, genetic variation