IngentaConnect Future CO2 concentrations, though not warmer temperatures, enhanc...

Authors: Alonso, Aitor¹; Pérez, Pilar¹; Morcuende, Rosa¹; Martinez-Carrasco, Rafael

Source: Physiologia Plantarum, Volume 132, Number 1, January 2008 , pp. 102-112(11)

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Abstract:

The temperature dependence of C3 photosynthesis is known to vary according to the growth environment. Atmospheric CO₂ concentration and temperature are predicted to increase with climate change. To test whether long-term growth in elevated CO₂ and temperature modifies photosynthesis temperature response, wheat (Triticum aestivum L.) was grown in ambient CO₂ (370 μmol mol⁻¹) and elevated CO₂ (700 μmol mol⁻¹) combined with ambient temperatures and 4°C warmer ones, using temperature gradient chambers in the field. Flag leaf photosynthesis was measured at temperatures ranging from 20 to 35°C and varying CO₂ concentrations between ear emergence and anthesis. The maximum rate of carboxylation was determined in vitro in the first year of the experiment and from the photosynthesis-intercellular CO₂ response in the second year. With measurement CO₂ concentrations of 330 μmol mol⁻¹ or lower, growth temperature had no effect on flag leaf photosynthesis in plants grown in ambient CO₂, while it increased photosynthesis in elevated growth CO₂. However, warmer growth temperatures did not modify the response of photosynthesis to measurement temperatures from 20 to 35°C. A central finding of this study was that the increase with temperature in photosynthesis and the photosynthesis temperature optimum were significantly higher in plants grown in elevated rather than ambient CO₂. In association with this, growth in elevated CO₂ increased the temperature response (activation energy) of the maximum rate of carboxylation. The results provide field evidence that growth under CO₂ enrichment enhances the response of Rubisco activity to temperature in wheat.

Document Type: Research article

DOI: 10.1111/j.1399-3054.2007.00997.x

Affiliations: 1: Institute for Natural Resources and Agricultural Biology of Salamanca, CSIC, Apartado 257, E-37071 Salamanca, Spain

Future CO2 concentrations, though not warmer temperatures, enhance wheat photosynthesis temperature responses

Future CO₂ concentrations, though not warmer temperatures, enhance wheat photosynthesis temperature responses