Effect of Elevated Air CO2 Concentration on the CO2 Assimilation of Winter Wheat
Increasing number of experiments have been carried out since the seventies to analyse the effect of elevated air CO2 concentration on wheat (1, 2, 3). It was found that the photosynthetic rate of plants grown at higher CO2 concentrations was more intense, while the transpiration rate decreased compared to plants grown in our present day CO2 level, leading to a better water use efficiency (2), a greater amount of biomass and, in many cases, to higher yields (4). Although elevated atmospheric CO2 increases the photosynthesis and growth of C3 plants, the magnitude of this increase is very difficult to predict. Simulation models would be able to describe the effects of high CO2 on photosynthesis, but the contradictory results obtained in a vast number of studies nevertheless raises the question of how photosynthesis can be predicted without having to carry out the measurements.
Key wordsacclimation rubisco capacity modelling CO2 assimilation
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