检测了47个水稻籼粳杂种F1的花粉育性，平均值为(79.9±31.2)%，其中68%组合的花粉育性低于90%。研究了代表性组合IR36/Kamairazu不同世代的花粉育性，F1的花粉育性为79.5%，其衍生的63个F2单株的平均花粉育性为(91.0±15.7)%。花粉育性高达98.3%的F2单株A4-3衍生的81个F3单株的平均花粉育性为(95.9±11.1)%，而育性为61%的A4-6衍生的51个F3单株的平均花粉育性仅为(74.3±35.2)%。在A4-3衍生的F3中选用2个花粉育性分别为99.2%和99.5%的单株，其衍生的F4群体的平均花粉育性分别为(93.0±7.4)%和(94.9±3.5)%，而2个花粉育性均为69.2%的单株衍生的F4群体的平均花粉育性则分别为(88.5±22.1)%和(89.8±6.7)%。IR36/Kamairazu的花粉育性受多基因控制，符合多基因座单位点孢子体—配子体互作模式。在F2、F3和F4群体中，平均育性水平较高的群体，单株花粉育性与小穗受精率无显著相关性，而在平均育性水平较低的群体中，花粉育性与小穗受精率呈显著或极显著正相关。
To understand inheritance of pollen fertility in progenies of indica-japonica hybrid rice, the present study tested pollen fertility of 47 indica-japonica F1 and tracked that in progenies of a representative hybrid, IR36/Kamairazu (KM). The 47 hybrids had an averaged pollen fertility of (79.9±31.2)%, and 68% of them showed partial pollen sterility by their fertility lower than 90%. The pollen fertility of IR36/KM F1 was 79.5%, its derived F2 plants have a higher averaged fertility as (91.0±15.7)% (Fig.1). A plant A4-3, which was from F2 population and have pollen fertility of 98.3%, showed averaged fertility of (95.9±11.1)% in its derived F3 population including 81 plants. While, a plant A4-6, which has pollen fertility of 61%, showed a significant lower averaged fertility of (74.3±35.2)% in its derived population including 51 plants (Fig.1). Two plants which were in F3 population derived from A4-3 and have pollen fertility of 99.2% and 99.5%, derived populations of fertility as (93.0±7.4)% and (94.9±3.5)%, respectively. While, two plants, both of which have pollen fertility of 69.2%, derived populations of fertility as (88.5±22.1)% and (89.8±6.7)% (Table 1). The results implied that, pollen fertility of IR36/KM was controlled by multigene, and showed conform to the allelic interaction model. In the F2, two F3 and four F4 populations, there were no significant correlation between pollen fertility and spikelet fertilized rate in populations which have higher averaged pollen fertility, while, showed significant correlation in populations which have lower averaged pollen fertility (Table 2).
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