| Richards equation was used to express dry matter accumulation during grain filling of trangsgenic (BADH) rice genotype 52-7 under irrigated and un-irrigated cultivation. The results showed that Rrichards equation was fitted to the process of weight increase and starch accumulation of both superior and inferior grains for both water treatments. Asynchronous grain filling was more severe in paddy cultivation than upland cultivation. Under upland condition, the mean rates of grain filling in both superior and inferior grains were greater, the occurrence time of the maximum grain filling rate was advanced, and the active grain filling period was shortened. The maximum grain filling rate of the superior grains under upland was larger than that under paddy, while the maximum grain filling rate of the inferior grains under upland was smaller than that under paddy. During 5d-20d after flowering, the starch accumulation at the beginning of grain filling under upland was appreciably higher than that under paddy, and then it was contrary. The trend of soluble sugar content in superior grains was basically identical under both paddy and upland, but the difference of soluble sugar content in inferior grains was evident. The difference of 1000-grain weight between upland and paddy was significant, but that of grain number per panicle, number of filled grains per panicle, seed setting rate and yield was not significant. |