Figure 2 Impacts of growth temperature, water regime and heatwave on the ratio of intercellular to atmospheric CO2 (Ci/Ca; panel a, b) and leaf level carbon balance represented by the difference between rates of photosynthesis and dark respiration (Asat-Rn; panel c, d) of cotton plants. Bars indicate mean value for each treatment combination and error bars represent standard error of mean (n=5). Thermal regimes characterized by different daytime temperature (i.e. 32/22oC and 32/26oC) are indicated by hatched bars.