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

摘要： 分析了源自多年生种质糯稻891和4个不同材料配制的杂交组合腋芽越冬性的遗传力和其中3个杂交组合F2代主要农艺性状的遗传变异。千粒重和株高具有较高的遗传力，正季最大，越冬再生季最小，每穗粒数和结实率再生季的遗传力最大。3个杂交组合F2每穗总粒数、千粒重、株高和穗长的平均值与F1很接近，且均呈正态分布，从F1到F2不存在配子选择；结实率在正季和越冬再生季变幅和变异系数较大，3季的平均结实率均高于F1，再生季最高，结实率呈双峰分布，说明F1到F2存在配子选择，选择的结果总是有利于高结实率的配子

关键词: 水稻, 腋芽, 越冬性, 农艺性状, 遗传变异