Global warming is partly due to increasing atmospheric CO2 concentrations. Global warming will probably increase drought periods. Plants assimilate CO2 by photosynthesis to build plant roots, leaves and shoots. There is actually little knowledge on how plants will respond to increasing CO2 and drought stress. Erbs et al grew maize under ambient CO2 concentration, of 380 ppm, and elevated CO2 concentration, of 550 ppm. Some maize plants were grown well-watered, others were under drought stress. Results show that maize is not altered under elevated CO2 if maize is well-watered, contrary to some other plant species. Maize is thus a promising crop for future climate, provided that maize is well watered.
