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Postanthesis Moderate Wetting Drying Improves Both Quality and Quantity of Rice Yield

^a Key Lab. of Crop Genetics and Physiology of Jiangsu Province, Yangzhou Univ., Yangzhou, Jiangsu, China
^b Dep. of Biology, Hong Kong Baptist Univ., Hong Kong, China

View larger version (31K): [in this window] [in a new window]   Fig. 1. Soil water potential of rice cv. (A) Zhendao 88 and (B) Shanyou 63 under various irrigation treatments. The abbreviations CI, WMD, and WSD indicate conventional irrigation, alternate wetting and moderate soil drying, and alternate wetting and severe soil drying, respectively, during grain filling (6–48 d after heading). Data are averages observed for the two study years. Vertical bars represent ± standard error of the mean (n = 24) where these exceed the size of the symbol.

View larger version (17K): [in this window] [in a new window]   Fig. 2. Leaf water potential of rice cv. (A) Zhendao 88 and (B) Shanyou 63 under various irrigation treatments. The abbreviations CI, WMD, and WSD indicate conventional irrigation, alternate wetting and moderate soil drying, and alternate wetting and severe soil drying, respectively, during grain filling (6–48 d after heading). Measurements were made on the flag leaves at midday (1130 h) when soil water potentials were –25 kPa in WMD and –50 kPa in WSD. Data are averages observed for the two study years. Vertical bars represent ± standard error of the mean (n = 12) where these exceed the size of the symbol.

View larger version (19K): [in this window] [in a new window]   Fig. 3. Root oxidation activity of rice cv. (A) Zhendao 88 and (B) Shanyou 63 under various irrigation treatments. The abbreviations CI, WMD, and WSD indicate conventional irrigation, alternate wetting and moderate soil drying, and alternate wetting and severe soil drying, respectively, during grain filling (6–48 d after heading). Measurements were made when soil water potentials were –25 kPa in WMD and –50 kPa in WSD. Data are averages observed for the two study years. Vertical bars represent ± standard error of the mean (n = 12) where these exceed the size of the symbol.

View larger version (17K): [in this window] [in a new window]   Fig. 4. Photosynthetic rate of the flag leaf of rice cultivars (A) Zhendao 88 and (B) Shanyou 63 under various irrigation treatments. The abbreviations CI, WMD, and WSD indicate conventional irrigation, alternate wetting and moderate soil drying, and alternate wetting and severe soil drying, respectively, during grain filling (6–48 d after heading). Measurements were made when soil water potentials were –25 kPa in WMD and –50 kPa in WSD. Data are averages observed for the two study years. Vertical bars represent ± standard error of the mean (n = 12) where these exceed the size of the symbol.

View larger version (32K): [in this window] [in a new window]   Fig. 5. Activities of sucrose synthase (SuS) (A, B), adenosine diphosphate glucose pyrophosphorylase (AGP) (C, D), starch synthase (StS) (E, F), and starch-branching enzyme (SBE) (G, H) in the grains of rice cv. Zhendao 88 (A, C, E, G) and Shanyou 63 (B, D, F, H) under various irrigation treatments. The abbreviations CI, WMD, and WSD indicate conventional irrigation, alternate wetting and moderate soil drying, and alternate wetting and severe soil drying, respectively, during grain filling (6–48 d after heading). Measurements were made when soil water potentials were –25 kPa in WMD and –50 kPa in WSD. Data are averages observed for the two study years. Vertical bars represent ± standard error of the mean (n = 12) where these exceed the size of the symbol.