在苗期、分蘖期和抽穗期等3个生育时期对常规籼型水稻IR64和IR64 Sub1A耐淹基因导入系（IRRI149）进行淹水处理，测定各个生育时期淹水后的有效分蘖数、每穗粒数、结实率、千粒重和单株产量，以确定不同生育时期淹水对Sub1A耐淹基因导入系产量的影响。结果表明，在苗期淹水，IRRI149和IR64的单株产量分别为39.11 g、24.92 g；分蘖期淹水，分别为10.31 g、0.48 g；抽穗期淹水，分别为24.35 g、23.36 g。IRRI149在苗期和分蘖期淹水条件下，有效分蘖数、每穗粒数、结实率、千粒重、单株产量均显著高于IR64；3个处理时期中以分蘖期淹水对产量的影响最为明显。

IR64 and Sub1A gene introgression line were watetflooding at seedling stage, tillering stage and heading stage, the effective tiller number, grain number per panicle, seed setting rate, thousand seed weight and single plant yield were measured to evaluate the reduction of rice yield loss by Sub1A gene. The results showed that the average single plant yield of Sub1A gene introgression line and IR64 submerged reached 39.11 g and 24.92 g at seedling stage, 10.31 g and 0.48 g at tilling stage, 24.35 g and 23.36 g at heading stage, respectively. The effective tiller number, grain number per panicle, seed setting rate, thousand seed weight and yield of Sub1A gene introgression line were all significantly higher than IR64 when waterflooding at seeding stage and tillering stage.