Summary
This historical analysis utilises archived wheat samples collected over 166 years to document significant shifts in grain nutritional composition. Whilst yield and carbohydrate content have increased, concurrent declines in mineral and protein density have occurred, particularly since the 1960s, correlating with rising atmospheric CO₂, elevated temperatures, and the adoption of shorter-straw wheat varieties. The findings suggest that modern breeding selection for yield may have inadvertently compromised the nutritional quality of wheat grain.
UK applicability
The Broadbalk Experiment is located in the United Kingdom, making these findings directly applicable to UK wheat cultivation history and contemporary breeding programmes. The results inform debates about the nutritional adequacy of UK-grown wheat and the potential trade-offs between agronomic yield and grain nutrient density in temperate cereal production.
Key measures
Wheat grain carbohydrate content, mineral composition, protein content, grain yield, straw height, ambient CO₂ concentration, temperature
Outcomes reported
The study analysed archived wheat grain samples spanning 1850–2016 from the Broadbalk Continuous Wheat Experiment and herbaria across 16 countries, documenting changes in yield, mineral composition, protein content, and carbohydrate content. Results demonstrated a decline in mineral and protein content alongside increased carbohydrate content, with the most pronounced imbalance occurring after the 1960s.
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