Elevated CO2, temperature, and N effects on the photosynthesis of rice
1999
Baysa, M.C. | Tremmel, D.C. | Reynolds, J.F. | Rivero, G.C. | Tabbada, R.A. (University of Santo Tomas, Manila (Philippines). Research Center for Natural Sciences)
Rice (Oryza sativa L. cv. IR72) was grown in growth chambers under all combinations of two CO2 concentration (375 and 750 mL/L), temperature (29/21 and 34/26 deg C day/night) and N concentration (40 and 80 mg/L) regimes. The stimulation of photosynthetic rates at elevated CO2 in both levels of temperature and N treatments was maintained until flowering. Rubisco total activity and content increased with elevated CO2 and ambient temperature in both N treatments at 47 days after sowing (DAS), but declined in CO2-enriched plants at flowering under both temperature and N treatments. CO2-enriched plants at ambient temperature had higher overall leaf soluble sugar and starch contents. There was accumulation of starch in the leaves of CO2-enriched plants grown at ambient temperature and low N at flowering. Rice plants cv. IR72 have a high optimum temperature for photosynthesis under future global warming conditions
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