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

Sharon B. Gray, Orla Dermody, Stephanie P. Klein, Anna M. Locke, Justin M. McGrath, Rachel E. Paul, David M. Rosenthal, Ursula M. Ruiz-Vera, Matthew H. Siebers, Reid Strellner, Elizabeth Ainsworth, Carl Bernacchi, Stephen P Long, Donald Richard Ort, Andrew Leakey

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Article number16132
JournalNature Plants
Volume2
DOIs
StatePublished - Sep 5 2016

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carbon dioxide
drought
soybeans
field experimentation
crop losses
global change
products and commodities
energy balance
crop yield
weather
photosynthesis
canopy
crops

ASJC Scopus subject areas

  • Plant Science

Cite this

Intensifying drought eliminates the expected benefits of elevated carbon dioxide for soybean. / Gray, Sharon B.; Dermody, Orla; Klein, Stephanie P.; Locke, Anna M.; McGrath, Justin M.; Paul, Rachel E.; Rosenthal, David M.; Ruiz-Vera, Ursula M.; Siebers, Matthew H.; Strellner, Reid; Ainsworth, Elizabeth; Bernacchi, Carl; Long, Stephen P; Ort, Donald Richard; Leakey, Andrew.

In: Nature Plants, Vol. 2, 16132, 05.09.2016.

Research output: Contribution to journalArticle

Gray, SB, Dermody, O, Klein, SP, Locke, AM, McGrath, JM, Paul, RE, Rosenthal, DM, Ruiz-Vera, UM, Siebers, MH, Strellner, R, Ainsworth, E, Bernacchi, C, Long, SP, Ort, DR & Leakey, A 2016, 'Intensifying drought eliminates the expected benefits of elevated carbon dioxide for soybean', Nature Plants, vol. 2, 16132. https://doi.org/10.1038/nplants.2016.132
Gray, Sharon B. ; Dermody, Orla ; Klein, Stephanie P. ; Locke, Anna M. ; McGrath, Justin M. ; Paul, Rachel E. ; Rosenthal, David M. ; Ruiz-Vera, Ursula M. ; Siebers, Matthew H. ; Strellner, Reid ; Ainsworth, Elizabeth ; Bernacchi, Carl ; Long, Stephen P ; Ort, Donald Richard ; Leakey, Andrew. / Intensifying drought eliminates the expected benefits of elevated carbon dioxide for soybean. In: Nature Plants. 2016 ; Vol. 2.
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