Intensifying drought eliminates the expected benefits of elevated carbon dioxide for soybean

Gray, S.B. and Dermody, O. and Klein, S.P. and Locke, A.M. and McGrath, J.M. and Paul, R.E. and Rosenthal, D.M. and Ruiz-Vera, U.M. and Siebers, M.H. and Strellner, R. and Ainsworth, E.A. and Bernacchi, C.J. and Long, S.P. and Ort, D.R. and Leakey, A.D.B. (2016) Intensifying drought eliminates the expected benefits of elevated carbon dioxide for soybean. Nature Plants, 2. ISSN 2055-0278

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Stimulation of C3 crop yield by rising concentrations of atmospheric carbon dioxide ([CO2]) is widely expected to counteract crop losses that are due to greater drought this century. But these expectations come from sparse field trials that have been biased towards mesic growth conditions. This eight-year study used precipitation manipulation and year-to-year variation in weather conditions at a unique open-air field facility to show that the stimulation of soybean yield by elevated [CO2] diminished to zero as drought intensified. Contrary to the prevalent expectation in the literature, rising [CO2] did not counteract the effect of strong drought on photosynthesis and yield because elevated [CO2] interacted with drought to modify stomatal function and canopy energy balance. This new insight from field experimentation under hot and dry conditions, which will become increasingly prevalent in the coming decades, highlights the likelihood of negative impacts from interacting global change factors on a key global commodity crop in its primary region of production. © 2016 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.

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Journal Article
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Nature Plants
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03 Mar 2020 09:40
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22 Nov 2022 07:51