STUDIES ON THE DEVELOPMENT OF GRAIN FILLING OF TWO-LINE INTERSUBSPECIFIC HYBRID RICE LIANGYOUPEIJIU

The characteristics of grain filling of two line intersubspecific hybrid rice Liangyoupeijiu were studied from the swell rate of the volume of the fertilized ovary and the grain dry weight. The results were listed as follows: ① The order of flowering significantly and negatively correlated with the swell rate of the volume of the fertilized ovary, the grain plumpness and the average grain weight of single grain. ② The swell rate of the volume of the fertilized ovary and the grain dry weight of Liangyoupeijiu are lower than Shanyou 63, the average grain weight and the grain plumpness are also lower than Shanyou 63. ③ Applying grain fertilizer, cutting 2/3 per leaves of the three leave under head, removing half spikelets at early heading stage can markedly affect the filling rate, the plumpness and the weight of the grains through changing the swell rate of the weak grains fertilized ovary. Applying grain fertilizer or removing half spikelets can significantly increase the plumpness of grain and the grain weight, but the results of cutting leaves were reversed.