期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 62, 期 9, 页码 3235-3246出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/err056
关键词
Climate change; stomata; stress; Zea mays
资金
- U.S. Department of Energy (DOE)
- Illinois Council for Food and Agricultural Research (CFAR)
- Archer Daniels Midland Company (ADM)
- DOE through the Office of Science (BER) Midwestern Regional Center of the National Institute for Climatic Change Research at Michigan Technological University [DE-FC02-06ER64158]
Predictions of future ecosystem function and food supply from staple C-4 crops, such as maize, depend on elucidation of the mechanisms by which environmental change and growing conditions interact to determine future plant performance. To test the interactive effects of elevated [CO2], drought, and nitrogen (N) supply on net photosynthetic CO2 uptake (A) in the world's most important C-4 crop, maize (Zea mays) was grown at ambient [CO2] (similar to 385 ppm) and elevated [CO2] (550 ppm) with either high N supply (168 kg N ha(-1) fertilizer) or limiting N (no fertilizer) at a site in the US Corn Belt. A mid-season drought was not sufficiently severe to reduce yields, but caused significant physiological stress, with reductions in stomatal conductance (up to 57%), A (up to 44%), and the in vivo capacity of phosphoenolpyruvate carboxylase (up to 58%). There was no stimulation of A by elevated [CO2] when water availability was high, irrespective of N availability. Elevated [CO2] delayed and relieved both stomatal and non-stomatal limitations to A during the drought. Limiting N supply exacerbated stomatal and non-stomatal limitation to A during drought. However, the effects of limiting N and elevated [CO2] were additive, so amelioration of stress by elevated [CO2] did not differ in magnitude between high N and limiting N supply. These findings provide new understanding of the limitations to C-4 photosynthesis that will occur under future field conditions of the primary region of maize production in the world.
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