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Remobilization of Carbon Reserves Is Improved by Controlled Soil-Drying during Grain Filling of Wheat

^a College of Agric., Yangzhou Univ., Yangzhou, Jiangsu, People's Republic of China
^b Dep. of Biology, Hong Kong Baptist Univ., Kowloon Tong, Hong Kong, People's Republic of China
^c Agric. Bureau of Liangyungang, Jiangsu, People's Republic of China

View larger version (22K): [in a new window]   Fig. 1 Soil water potential of semi-winter wheat cultivars Yangmai 158 (A) and Yangmai 931 (B) in the pot experiment and winter wheat cultivar Yanfu 188 (C) in the field experiment when controlled soil drying was applied. Symbols NN and HN indicate normal and high levels of N application at heading time, and WW, MD, SD, and WS are well watered, mildly dried, severely dried (for the pot experiment), and water stressed (for the field experiment) during the grain filling. Vertical bars represent ± SE of the mean where values exceed the size of the symbol

View larger version (22K): [in a new window]   Fig. 2 Diurnal changes in flag leaf water potential of semi-winter wheat cultivars Yangmai 158 (A) and Yangmai 931 (B) in the pot experiment and winter wheat cultivar Yanfu 188 (C) in the field experiment after controlled soil drying was applied. Treatment details are the same as in Fig. 1. Measurements were made 20 DAA for Yangmai 158, 21 DAA for Yangmai 931, and 24 DAA for Yanfu 188. Vertical bars represent ± SE of the mean where values exceed the size of the symbol

View larger version (25K): [in a new window]   Fig. 3 Diurnal changes in flag leaf conductance of semi-winter wheat cultivars Yangmai 158 (A) and Yangmai 931 (B) in the pot experiment and winter wheat cultivar Yanfu 188 (C) in the field experiment after controlled soil drying was applied. Treatment details are the same as in Fig. 1. Measurements were made 20 DAA for Yangmai 158, 21 DAA for Yangmai 931, and 24 DAA for Yanfu 188. Vertical bars represent ± SE of the mean where values exceed the size of the symbol

View larger version (21K): [in a new window]   Fig. 4 Photosynthetic rates of flag leaves of semi-winter wheat cultivars Yangmai 158 (A) and Yangmai 931 (B) in the pot experiment and winter wheat cultivar Yanfu 188 (C) in the field experiment after controlled soil drying was applied. Treatment details are the same as in Fig. 1. Arrows in the figures indicate the start of soil drying treatments. Vertical bars represent ± SE of the mean where values exceed the size of the symbol

View larger version (19K): [in a new window]   Fig. 5 Chlorophyll concentrations in the flag leaves of semi-winter wheat cultivars Yangmai 158 (A) and Yangmai 931 (B) in the pot experiment and winter wheat cultivar Yanfu 188 (C) in the field experiment after controlled soil drying was applied. Treatment details are the same as in Fig. 1. Arrows in the figure indicate the start of soil drying treatments. Vertical bars represent ± SE of the mean where values exceed the size of the symbol

View larger version (21K): [in a new window]   Fig. 6 Nonstructural carbohydrate concentrations in the stem and sheath of semi-winter wheat cultivars Yangmai 158 (A) and Yangmai 931 (B) in the pot experiment and winter wheat cultivar Yanfu 188 (C) in the field experiment after controlled soil drying was applied. Treatment details are the same as in the Fig. 1. Arrows in the figure indicate the start of soil drying treatments. Vertical bars represent ± SE of the mean where values exceed the size of the symbol