Abstract: Phenotypic distributions of panicle angle and number of spikelets per panicle were investigated in P₁, P₂, F₁ and F₂ generations(in 2002) and P₁, P₂, F₁, F₂, F_2∶3 generations(in 2003) from the cross Bing 8979(erect panicle, japonica rice) and C Bao(curved panicle, japonica rice). Genetic analyses for the two traits were conducted by using major gene-polygene mixed inheritance models and joint analysis method of segregating plus non-segregating generations. Both panicle angle and number of spikelets per panicle were controlled by two major genes+polygenes. Both the independent two major genes and polygenes had additive-dominance-epistatic effects.Panicle angle was mainly governed by major gene, while number of spikelets per panicle was by polygenes.

Key words: japonica rice, panicle angle, number of spikelets per panicle, major genes plus polygene model, genetic analysis

摘要： 调查了粳稻直立穗品种丙8979与弯曲穗品种C堡杂交组合的P1、P2、F1、F2四个世代（2002年）和P1、P2、F1、F2、F2∶3五个世代(2003年）的穗角和每穗颖花数的表型分布。运用主基因+多基因混合遗传模型和分离世代加不分离世代联合分析的方法，对这两个性状进行了遗传分析。结果表明，穗角和每穗颖花数性状均受2对主基因+多基因共同控制。独立的2对主基因和多基因都存在加性显性上位性效应。穗角性状以主基因遗传为主；每穗颖花数性状以多基因遗传为主。

关键词: 粳稻, 穗角, 每穗颖花数, 主基因+多基因遗传模型, 遗传分析