The increase in the atmospheric CO concentration is predicted to influence wheat production and grain quality and nutritional properties. In the present study, durum wheat ( Desf. cv. Sula) was grown under two different CO (400 versus 700 μmol mol) concentrations to examine effects on the crop yield and grain quality at different phenological stages (from grain filling to maturity). Exposure to elevated CO significantly increased aboveground biomass and grain yield components. Growth at elevated CO diminished the elemental N content as well as protein and free amino acids, with a typical decrease in glutamine, which is the most represented amino acid in grain proteins. Such a general decrease in nitrogenous compounds was associated with altered kinetics of protein accumulation, N remobilization, and N partitioning. Our results highlight important modifications of grain metabolism that have implications for its nutritional quality.
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