Figure 3.

Area under disease-progress curve (AUDPC) as affected by maternal CO₂ concentration (280, 440, 600 ppm, Case 1; left panels) and maternal CO₂ × plant type (P = pink flowering, W = white flowering, Case 2; right panels) in 2006 and 2007. AUDPC was calculated according to Eq. 1. Mean ± 1 SE, n = 3 model ecosystems. Non-identical letters indicate statistically significant differences among maternal CO₂ concentrations (left panels) or combinations of maternal CO₂ treatments and plant type (right panels) as analyzed by the Tukey–Kramer HSD test (P ≤ 0.05 within mixed models, see Table 4).