Rising Atmospheric CO2 Lowers Concentrations of Plant Carotenoids Essential to Human Health : A Meta-Analysis

Loladze, Irakli and Nolan, John M. and Ziska, Lewis H. and Knobbe, Amy R. (2019) Rising Atmospheric CO2 Lowers Concentrations of Plant Carotenoids Essential to Human Health : A Meta-Analysis. Molecular Nutrition and Food Research, 63 (15). ISSN 1613-4125

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Plant and human tissues (e.g., leaves, retina) share the need for carotenoids to protect against light-induced and other oxidative stresses. While plants synthesize carotenoids de novo, humans must obtain them primarily through plant-based foods. In plants, elevated levels of atmospheric carbon dioxide (eCO2) decrease the concentrations of essential minerals, including magnesium and zinc (essential for brain and eye health), but the overall effect of globally rising CO2 levels on carotenoids is unknown. Here, investigation is sought on how eCO2 affects carotenoids in plants. A meta-analysis of 1026 experimental observations from 37 studies shows that eCO2 decreases plant carotenoid concentrations by 15% (95% CI: −26% to −6%). The meta-analysis of available gene expression data for Arabidopsis thaliana points to a potential CO2-induced downregulation of carotenoid biosynthesis (Log2 fold-change −13%, 95% CI: −17% to −9%). Some other stoichiometric and biochemical mechanisms related to CO2-induced changes in carotenoids are also highlighted. While overall eCO2 decreases carotenoid concentrations, individual CO2 studies report variable responses, including increases in carotenoid levels, especially in abiotically stressed plants. The initial assessment raises a novel question about the potential effects of rising CO2 on human health through its global effect on plant carotenoids.

Item Type: Article
Additional Information: Funding Information: The authors thank three anonymous referees for comments. Publisher Copyright: © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1300/1305
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Depositing User: Admin SSL
Date Deposited: 19 Oct 2022 23:04
Last Modified: 26 Jul 2023 18:40
URI: http://repository-testing.wit.ie/id/eprint/3916

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