水稻籼粳交DH群体籽粒充实度的遗传分析

籽粒充实度差是限制亚种间杂交稻产量潜力发挥的重要因素。作者对籼粳交（圭630／02428）DH群体的籽粒充实度进行了研究，结果表明，籽粒充实度是受多基因控制的数量性状，在该DH群体中发生分离的基因估计数为5－6对。通过估测三级（偏度）和四级（峰度）统计量，检测到控制籽粒充实度的多基因间存在重叠作用。DH群体中籽粒充实度表现出明显的超亲分离，表明基因重组可实现控制籽粒充实度的增效基因的聚合。籽粒充实度与单穗产量、穗均实粒数和干物质／总库容之比呈显著或极显著正相关，与千粒重、穗均颖花数和穗均总库容相关不显著。

Genetic Analysis of Grain Plumpness of Rice Using a DH Population Derived from an Indica/Japonica Cross

Poor grain filling is one of the major constraints to increase yield potential of intersubspecific hybrid of rice.Genetic analysis of grain plumpness was conducted with a doubled haploid (DH) population derived from an indica/japonica cross in the present study.The results revealed that rice grain plumpness was a quantitative trait genetically controlled by polygenes.There were about 5~6 genes to segregate in the DH population for the trait.Duplicate interactions among these genes were detected based on estimation of third and fourth statistics (skewness and kurtosis).Transgressive segregation was observed for grain plumpness,implying that pyramiding of the favorable alleles for grain filling could result from gene recombination.Rice grain plumpness was positively correlated with grain yield,number of filled grains per panicle,and the ratio of dry matter weight to capacity of sink at 5% or 1% levels,while not significantly with 1000-grain weight,number of spikelets per panicle,and capacity of sink.