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Growth in elevated CO2 enhances temperature response of photosynthesis in wheat

AuthorsAlonso, Aitor ; Pérez Pérez, Pilar ; Martínez-Carrasco, Rafael
Issue Date2008
PublisherBlackwell Publishing
AbstractThe temperature dependence of C3 photosynthesis may be altered by the growth environment. The effects of long-term growth in elevated CO2 on photosynthesis temperature response have been investigated in wheat (Triticum aestivum L.) grown in controlled chambers with 370 or 700 µmol mol-1 CO2 from sowing through to anthesis. Gas exchange was measured in flag leaves at ear emergence, and the parameters of a biochemical photosynthesis model were determined along with their temperature responses. Elevated CO2 slightly decreased the CO2 compensation point and increased the rate of respiration in the light and Rubisco Vcmax, although the latter effect was reversed at 15 ºC. With elevated CO2, Jmax decreased in the 15 ºC-25 ºC temperature range and increased at 30 ºC and 35 ºC. The temperature response (activation energy) of Vcmax and Jmax increased with growth in elevated CO2. CO2 enrichment decreased the RuBP-limited photosynthesis rates at lower temperatures and increased Rubisco- and RuBP-limited rates at higher temperatures. The results show that the photosynthesis temperature response is enhanced by growth in elevated CO2. We conclude that if temperature acclimation and factors such as nutrients or water availability do not modify or negate this enhancement, the effects of future increases in air CO2 on photosynthetic electron transport and Rubisco kinetics may improve the photosynthetic response of wheat to global warming.
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