摘要： 以5个粳型不育系和5个广亲和品种为亲本，按p×q交配模式配制25个亚种间杂交稻组合，进行了子粒充实度的遗传分析。结果表明：子粒充实度差具有全穗性，充实度以穗的上位、中位和下位依次递减；子粒充实度的变异主要是由遗传因素引起的，其广义遗传力在0.82以上，以加性效应为主；子粒充实度与其他性状之间存在着一定的相关关系。通径分析表明，饱粒数、千粒重、结实率和受精粒数对子粒充实度有较大的影响。

关键词: 水稻, 亚种间杂交稻, 子粒充实度, 遗传

Abstract: The grain plumpness was genetically analyzed on 25 intersubspecifichybrid rice combinations from 5 japonica sterile lines each crossed with 5 wide-compatible varieties. It was found that the grain plumpness was better on upper spikelet but worse on lower spikelet for a given panicle. The grain plumpness was genetically controlled with major additive effect, and the inheritance ability was over 0.82. Path-analysis further revealed that this grain plumpness was also influenced by other factors, mainly plump grains, 1000-grain weight, seed-setting ratio and fertilized grains.

Key words: Rice, Intersubspecific hybrid rice, Grain plumpness, Genetics

中图分类号: 

• S511.101