Field trials at elevated carbon dioxide levels show wheat protein composition changes in ways that could affect bread quality and food tolerability. Researchers in Germany grew ten winter wheat cultivars under 546 ppm CO2 and compared them with ambient plots. Nine of the ten cultivars lost grain protein, with reductions up to 10.3 percent, and lower gluten content tracked with poorer baking performance. One cultivar, Hyvega, gained protein, showing genetic variation exists for breeding programs to work with. Changes also appeared in amylase/trypsin-inhibitors and gluten-derived peptides linked to wheat sensitivities and celiac disease, though the health relevance is not yet clear. The study argues breeders should select for protein composition and baking quality alongside yield as atmospheric CO2 continues to rise. The results add a concrete food quality angle to climate adaptation planning, not just a yield or emissions story.
