TY - JOUR

T1 - Intensifying drought eliminates the expected benefits of elevated carbon dioxide for soybean

AU - Gray, S.B.

AU - Dermody, O.

AU - Klein, S.P.

AU - Locke, A.M.

AU - McGrath, J.M.

AU - Paul, R.E.

AU - Rosenthal, D.M.

AU - Ruiz-Vera, U.M.

AU - Siebers, M.H.

AU - Strellner, R.

AU - Ainsworth, E.A.

AU - Bernacchi, C.J.

AU - Long, S.P.

AU - Ort, D.R.

AU - Leakey, A.D.B.

PY - 2016/9/5

Y1 - 2016/9/5

N2 - 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.

AB - 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.

KW - carbon dioxide

KW - climate change

KW - drought

KW - metabolism

KW - physiological stress

KW - physiology

KW - soybean

KW - weather

KW - Carbon Dioxide

KW - Climate Change

KW - Droughts

KW - Soybeans

KW - Stress, Physiological

KW - Weather

U2 - 10.1038/nplants.2016.132

DO - 10.1038/nplants.2016.132

M3 - Journal article

VL - 2

JO - Nature Plants

JF - Nature Plants

SN - 2055-0278

M1 - 16132

ER -