Summary
This meta-analysis by Loladze (2014), published in Nature, synthesises evidence from multiple studies to demonstrate that rising atmospheric CO₂ consistently reduces the concentration of essential minerals and trace elements in plant tissues — a phenomenon described as a 'hidden shift' in the ionome. The study finds that elevated CO₂ appears to dilute nutritional quality across a broad range of crops and plant species, with implications for human dietary mineral intake as atmospheric CO₂ continues to rise. The work extends prior research on the CO₂ fertilisation effect by showing that yield increases may be accompanied by systematic declines in nutritional density.
UK applicability
The findings are directly applicable to the UK, where staple crops such as wheat and vegetables are grown under progressively rising atmospheric CO₂ levels; the results suggest that UK food and agricultural policy may need to account for declining mineral density in crops as part of broader climate adaptation and food security planning.
Key measures
Mineral and trace element concentrations (ionome) in plant tissue (mg/kg); percentage change under elevated vs ambient CO₂; effect sizes across species and mineral types
Outcomes reported
The study examined shifts in the ionome — the complete mineral and trace element profile — of plants grown under elevated CO₂ conditions, finding broad reductions in concentrations of essential minerals including iron, zinc, magnesium, and potassium. It quantified the magnitude and consistency of these dilution effects across a wide range of plant species and crop types.
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