期刊
FUNCTIONAL PLANT BIOLOGY
卷 44, 期 4, 页码 464-472出版社
CSIRO PUBLISHING
DOI: 10.1071/FP16383
关键词
dynamic photosynthesis; induction state; simulated sunflecks; steady-state photosynthesis; stomatal conductance; water deficit
资金
- National Key Research and Development Program of China [2016YFD0300102]
- National Natural Science Foundation of China [31301840]
- Foundation for the Author of National Excellent Doctoral Dissertation of PR China [201465]
- Fundamental Research Funds for the Central Universities [2662015PY031]
Water deficit is considered the major environmental factor limiting leaf photosynthesis, and the physiological basis for decreased photosynthesis under water deficit has been intensively studied with steady irradiance. Leaves within a canopy experience a highly variable light environment in magnitude and time, but the effect of water deficit on photosynthesis in fluctuating irradiance is not well understood. Two rice cultivars with different drought tolerance, Champa and Yangliangyou 6 (YLY6), were hydroponically grown under well-watered, 15% (m/v) and 20% PEG (polyethylene glycol, 6000Da) induced water deficit conditions. The inhibition of steady-state photosynthesis in Champa is more severe than YLY6. The maximum Rubisco carboxylation capacity (V-cmax) and maximum electron transport capacity (J(max)) were decreased under 20% PEG treatment in Champa, whereas less or no effect was observed in YLY6. The induction state (IS%, which indicates photosynthesis capacity after exposure of low-light period) of both leaf photosynthetic rate (A) and stomatal conductance (g(s)) was highly correlated, and was significantly decreased under water deficit conditions in both cultivars. Water deficit had no significant effect on the time required to reach 50 or 90% of the maximum photosynthetic rate (T-50%,T-A and T-90%,T-A) after exposure to high-light level, but significantly led to a greater decrease in photosynthetic rate in the low-light period under flecked irradiance (A(min-fleck)) relative to photosynthetic rate in the same light intensity of continuously low-light period (A(initial)). The lower IS% of A and more severe decrease in A(min-fleck) relative to A(initial) will lead to a more severe decrease in integrated CO2 fixation under water deficit in flecked compared with uniform irradiance.
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