Summary
This study demonstrates that elevated atmospheric CO₂ reduces seed iron and zinc content in Arabidopsis, a phenomenon potentially mitigated by increased transpiration. Using infrared imaging to isolate aca7 mutants defective in alpha carbonic anhydrase 7 expression, the authors show that these mutants maintain wild-type stomatal responses to abscisic acid and light whilst remaining responsive to elevated CO₂, resulting in higher transpiration rates. By increasing transpiration under high CO₂ conditions, aca7 mutants achieved higher seed Fe and Zn content than wild-type plants, suggesting a physiological mechanism by which plant water loss can partially offset micronutrient dilution under future atmospheric conditions.
UK applicability
Findings are based on controlled laboratory conditions in a model organism and would require validation in agronomic crop species grown under UK field conditions to assess practical relevance. The research suggests potential breeding targets for crop resilience to atmospheric CO₂ increase, though the applicability to UK cereal and horticultural production systems remains to be determined.
Key measures
Seed zinc content, seed iron content, transpiration rate, guard cell gene expression (ACA7), plant response to elevated CO₂ (1000 ppm)
Outcomes reported
The study measured seed zinc and iron content in Arabidopsis thaliana grown at ambient and elevated CO₂ (1000 ppm), and tested whether increased transpiration in aca7 mutants could mitigate CO₂-induced micronutrient reduction. Results showed that aca7 mutants with higher transpiration maintained higher seed Fe and Zn content compared to wild-type plants at elevated CO₂.
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