Figure 4.

Investigation of the potential influence of stomatal function and leaf senescence in high-CO₂ (hCO₂)-induced pathogenesis responses. A, SA contents in Col-0 and two mutants impaired in stomatal closure (ost1 and slac1) grown as in Figure 2B. B to D, Photographs, growth parameters, and SAG12 transcript abundance in Col-0 grown in air and at high CO₂ as in Figure 3. In C and D, black and white bars represent growth at air and high CO₂, respectively. Data are means ± se of 12 (growth parameters), four (SA), or three (SAG12 transcripts) biological replicates. Significant differences between the conditions at P < 0.05 are indicated by asterisks. FW, Fresh weight. Bars in B = 1 cm.