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Carbon Remobilization and Grain Filling in Japonica/Indica Hybrid Rice Subjected to Postanthesis Water Deficits

^a College of Agric., Yangzhou Univ., Yangzhou, Jiangsu, China
^b Dep. of Biol., Hong Kong Baptist Univ., Kowloon Tong, Hong Kong, China

View larger version (28K): [in a new window]   Fig. 1. Changes in leaf water potential of (A) an indica/indica (I/I) hybrid rice Shanyou 63 and two japonica/indica (J/I) hybrids, (B) Ce 03/Yangdao 4 and (C) PC 311/Zaoxiandang 18, during the first 28 d after withholding water. WW, MD, and SD are well watered, moderate water deficit, and severe water deficit, respectively, during grain filling. Measurements were made on the flag leaves at predawn (0600 h) and at midday (1130 h). Vertical bars represent ± standard error of the mean (n = 6) where these exceed the size of the symbol.

View larger version (20K): [in a new window]   Fig. 2. Changes in chlorophyll (Chl) content in the flag leaves of (A) an indica/indica (I/I) hybrid rice Shanyou 63 and two japonica/indica (J/I) hybrids, (B) Ce 03/Yangdao 4 and (C) PC 311/Zaoxiandang 18, during the first 28 d after withholding water. Treatment details are the same as in Fig. 1. Vertical bars represent ± standard error of the mean (n = 6) where these exceed the size of the symbol.

View larger version (21K): [in a new window]   Fig. 3. Photosynthetic rates (PR) of the flag leaves of (A) an indica/indica (I/I) hybrid rice Shanyou 63 and two japonica/indica (J/I) hybrids, (B) Ce 03/Yangdao 4 and (C) PC 311/Zaoxiandang 18, during the first 28 d after withholding water. Treatment details are the same as in Fig. 1. Vertical bars represent ± standard of the mean (n = 6) where these exceed the size of the symbol.

View larger version (22K): [in a new window]   Fig. 4. Nonstructural carbohydrate (NSC) concentrations in the culm and sheath of (A) an indica/indica (I/I) hybrid rice Shanyou 63 and two japonica/indica (J/I) hybrids, (B) Ce 03/Yangdao 4 and (C) PC 311/Zaoxiandang 18, during the grain filling. Treatment details are the same as in Fig. 1. Arrows in the figure indicate the start of water deficit treatments. Vertical bars represent ± standard error of the mean (n = 6) where these exceed the size of the symbol.