中文摘要：

以结实率正常的同源四倍体水稻杂交组合广陆矮4号-4x×L202-4x为材料,连续5代进行定向选择,调查结实率和几个主要农艺性状,分析定向选择对同源四倍体水稻结实率的遗传效应及结实率与农艺性状间的相关关系.在人工选择压力下,结实率的群体平均值逐代增大,高结实率单株的频率逐代增加,且上下代结实率呈显著水平的正相关关系.在定向选择过程中,随着结实率的提高,穗数、剑叶长、剑叶宽和穗颈抽出长有较小幅度的增加,但每穗粒数显著降低.

英文摘要：

The offsprings for 5 generations from autotetraploid hybrids with high seed setting rate Guanglu＇ai 4-4x×L202-4x were used to analysis genetic effects of directional selection on seed setting rate and correlation between seed setting rate and some main agronomic traits.Under artificial selection,the population mean of seed setting rate and frequency of plants with high seed setting rate increased generation by generation and the correlations of the seed setting rate between generations were significant.Number of panicle,length of flag leave,width of flag leave and elongastion of panicle neck increased slightly during directional selection of high seed setting rate,while number of grain per panicle decreased.