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2018 Vol.63, Issue 2 Preview Page
June 2018. pp. 164-173
Elevated atmospheric carbon dioxide concentration (CO2) is a major component of climate change, and this increase can be expected to continue into the crop and food security in the future. In this study, Soil-Plant-Atmosphere-Research (SPAR) chambers were used to examine the effect of elevated CO2, temperature, and drought on the canopy architecture and concentration of macronutrients in potatoes (Solanum tuberosum L.). Drought stress treatments were imposed on potato plants 40 days after emergence. Under AT+2.8C700 (30-year average temperature + 2.8℃ at 700 μmol mol-1 of CO2), at maximum leaf area, elevated CO2, and no drought stress, a significant increase was observed in both the aboveground biomass and tuber, and for the developmental stage. Even though CO2 and temperature had increased, AT+2.8C700DS (30-year average temperature + 2.8℃ at 700 μmol mol-1 of CO2 under drought stress) under drought stress showed that the leaf area index (LAI) and dry weight were reduced by drought stress. At maturity, potatoes grown under CO2 enrichment and no drought stress exhibited significantly lower concentrations of N and P in their leaves, and of N, P, and K in tubers under AT+2.8C700. In contrast, elevated CO2 and drought stress tended to increase the tuber Mg concentration under AT+2.8C700DS. Plants grown in AT+2.8C700 had lower protein contents than plants grown under ATC450 (30-year average temperature at 400 μmol mol-1 of CO2). However, plants grown under AT+2.8C700 showed higher tuber bulking than those grown under AT+2.8C700DS. These findings suggest that the increase in CO2 concentrations and drought events in the future are likely to decrease the macronutrients and protein concentrations in potatoes, which are important for the human diet.

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