Fig. 7. Grain filling process (A, B, C, and D) and grain filling rate (E, F, G, and H) of two two-line indica hybrids of rice, Pei-Ai 64S/Yangdao 6 (A, C, E, and G) and Pei-Ai 64S/E 32 (B, D, F, and H), in the pot (A, B, E, and F) and field (C, D, G, and H) experiments. WW, MD, and SD are well watered, moderate water deficit, and severe water deficit during grain filling. Grain filling rate was calculated according to the Richards (1959) equation (lines E-H). Arrows indicate the start of water deficit treatments. Vertical bars in the figure A, B, C and D represent ± SE of the mean (n = 2, for the pot experiment and n = 3 for the field experiment) where these exceed the size of the symbol. Both experiments were conducted at Yangzhou University farm, Jiangsu Province, China in 2001.