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Title

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

AuthorsAlonso, Aitor ; Pérez Pérez, Pilar ; Morcuende, Rosa ; Martínez-Carrasco, Rafael
Issue Date2008
PublisherBlackwell Publishing
CitationPhysiologia Plantarum 132: 102–112 (2008)
AbstractThe 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 and 4 ºC warmer temperatures, using temperature gradient chambers in the field. Flag leaf photosynthesis was measured at temperatures ranging from 20 ºC to 35 ºC 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 ºC to 35 ºC. 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 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.
Publisher version (URL)http://dx.doi.org/10.1111/j.1399-3054.2007.00997.x
URI10261/7746
DOI10.1111/j.1399-3054.2007.00997.x
ISSN0031-9317
Appears in Collections:(IRNASA) Artículos
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