Abstract
An experiment was performed to study gas exchange and chlorophyll fluorescence responses of rice (Oryza sativa L.) to various regimes, such as flooding–midseason drying–flooding (FDF), flooding–midseason drying–saturation (FDS), and flooding–rain-fed (FR) regimes. Compared to FDF, FR resulted in an obvious decrease in net photosynthetic rate (PN), due to the decrease in stomatal conductance and the increase in stomatal limitation. In contrast, FDS plants did not suffer stomatal limitation and had comparable PN with FDF plants. For diurnal light-saturated electron transport rate and saturation irradiance, FDF performed the best, which was followed by FDS and FR successively. FR and FDS plants tended to suffer from midday depression. FDS reduced irrigated water by 17.2% compared to FDF for comparable yields. The results suggested that FDS can be an effective irrigation regime to save water.
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Abbreviations
- C a :
-
ambient CO2 concentration
- Chl:
-
chlorophyll
- C i :
-
intercellular CO2 concentration
- E :
-
transpiration rate
- Em :
-
saturation irradiance
- ETR:
-
electron transport rate
- ETRmax :
-
light–saturated ETR
- FDF:
-
flooding–midseason drying–flooding water regime
- FDS:
-
flooding–midseason drying–saturating water regime
- FR:
-
flooding–rain-fed water regime
- Fm' :
-
maximal fluorescence yield of the light-adapted state
- Ft:
-
instantaneous fluorescence
- gs:
-
stomatal conductance
- Ls :
-
stomatal limitation value
- P N :
-
net photosynthetic rate
- RLC:
-
rapid light curve
- WP:
-
water productivity
- ΦPSII :
-
effective quantum yield of PSII photochemistry
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Acknowledgements: This work was supported by the National Natural Science Foundation of China (grant numbers: 41401292 and 41503081) and the International Science & Technology Cooperation Program of China (grant number: 2015DFA90450).
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Wu, X.H., Wang, W., Xie, X.L. et al. Photosynthetic and yield responses of rice (Oryza sativa L.) to different water management strategies in subtropical China. Photosynthetica 56, 1031–1038 (2018). https://doi.org/10.1007/s11099-018-0817-5
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DOI: https://doi.org/10.1007/s11099-018-0817-5