Format

Send to

Choose Destination
Nat Plants. 2016 Sep 5;2(9):16132. doi: 10.1038/nplants.2016.132.

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

Author information

1
Department of Plant Biology and Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Champaign, Illinois 61801, USA.
2
United States Department of Agriculture, Agricultural Research Service, Urbana, Illinois 61801, USA.

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.

Comment in

PMID:
27595230
DOI:
10.1038/nplants.2016.132
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Nature Publishing Group
Loading ...
Support Center