Overview
- The field experiment reported Monday, October 19, 2026, grew ten winter wheat varieties at ambient (~450 ppm) and elevated (546 ppm) CO2 and used mass spectrometry to compare grain proteins.
- Overall grain protein fell about 4.7–5 percent and gluten protein groups fell about 18.7–19 percent, which translated to roughly a 4.1 percent reduction in loaf volume in baking tests.
- Levels of amylase/trypsin‑inhibitors rose by up to about 11 percent, and these plant defence proteins are suspected of worsening some wheat‑related sensitivities and inflammatory responses.
- Responses varied strongly by variety, with some cultivars showing little change and others losing much more protein, which means breeding must include protein composition and processing quality as selection goals.
- A specific result for Puroindolines is disputed across reports, and the authors and commentators call for more field trials and biological and immunological studies to assess real health impacts and guide adaptation.