Elevated CO2, temperature, and N effects on the photosynthesis of rice

• Published in: Acta Manilana. Series B: Socio-economic and historical sciences Vol. 47
• Main Authors: 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)
• Format: Journal Article
• Language: English
• Published: 1999
• Subjects: AZOTE; CARBON DIOXIDE; DIOXIDO DE CARBONO; DIOXYDE DE CARBONE; FLORACION; FLORAISON; FLOWERING; FOTOSINTESIS; NITROGEN; NITROGENO; ORYZA SATIVA; PHOTOSYNTHESE; PHOTOSYNTHESIS; TEMPERATURA; TEMPERATURE
• ISSN: 0065-1370

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