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Interactive Effects of Elevated [CO2] and Drought on the Maize Phytochemical Defense Response against Mycotoxigenic Fusarium verticillioides
Fig 1
Drought treatment is representative of conditions in which maize plants benefit from elevated [CO2] induced water conservation.
Drought treatment was imposed on one month old maize by withholding water for five consecutive days. Gas exchange measurements were then taken from the fifth leaf of 1x[CO2] (400 μmol CO2 mol-1 air) or 2x[CO2] (800 μmol CO2 mol-1 air) grown maize. The average (a) stomatal conductance (gs), (b) percent soil water content and (c) photosynthetic rate (Pn) was estimated for each set of plants with irrigation (+H2O) or drought (-H2O) treatment. The statistically significant main effects of differences determined by a 2x2 ([CO2]xH2O) analysis of variance (ANOVA) are indicated in the top right hand corner of each graph. Since the interaction between the contributing factors was significant, a Tukey- Kramer honestly significant difference (HSD) test was performed to determine differences between means. Letters above standard error of mean (SEM) bars indicate significant differences (n = 4, P<0.01).