1985～1986年用6个株高不同的中国品种(系)与3个含Rht_1、Rht_2基因的美国矮源杂交,连同亲本(P_1、p_2)和F_1共26个基因型,种植在美国爱达荷大学温室。每基因型5盆10株,测定了节间长、茎长、穗长、株高、每穗小穗数、每穗粒数和粒重,记载了抽穗期和开花期。结果表明,9个品种在研究的全部性状间存在显著差异;杂种F_1的茎长、株高、多数节间表现显性或超显性;第5节间(穗下节间)长与茎长、株高间、茎长与株高间、穗长与穗粒数间、抽穗期与开花期间,均呈高度正相关;但第5节间长与抽穗、开花期为负相关。 Six Chinese cultivars (lines) with different plant heights from 1985 to 1986 were crossed with three American dwarfs with Rht_1 and Rht_2 genes, together with 26 parents (P_1, p_2) and F_1 genotypes, University greenhouse. There were 10 plants per 5 genotypes. The internode length, stem length, ear length, plant height, spikelet number per panicle, grain number per spike and grain weight were measured. The heading date and flowering stage were recorded. The results showed that there were significant differences among the 9 cultivars among all traits studied. The stem length, plant height and most internodes of hybrid F1 were dominant or over dominant. The length and stem length , Between plant height, stem length and plant height, spike length and number of grains per spike, heading time and flowering stage, all showed a highly positive correlation; however, the length of section 5 was negatively correlated with heading and flowering stage.