Abstract: The genetic expression of four quality traits, grain length (GL), grain width (GW), gelatinizationtemperature (GT) and amylose content (AC) was identified each by two indica/japonica crosses using two indica andthree japonica cultivars. The genetic expression of GL and GW is completely subject to the diploid maternal genotype, and that of GT and AC is controlled by the diploid maternal genotype as well as the triploid endosperm genotype. The endosperm genotype may play the main role in the genetic expression of GT and AC.

Key words: endosperm genotype, genetic expression, indica-japonica hybrid, maternal genotype, rice quality

摘要： 用2个籼稻品种和3个粳稻品种配成籼粳交组合，研究了4个稻米品质（粒长、粒宽、糊化温度和直链淀粉含量）的遗传表达。粒长和粒宽遗传表达完全受二倍体母体基因型决定，而糊化温度和直链淀粉含量的遗传表达同时受二倍体母体基因型和三倍体胚乳基因型控制，胚乳基因型起主要作用。

关键词: 籼粳组合, 稻米品质, 母体基因型, 胚乳基因型