Figure 11.

DHAR-OX plants maintain a higher rate of photosynthesis following a chronic exposure to ozone. In situ rates of transpiration (top), stomatal conductance (middle), and CO₂ assimilation (bottom) were measured in control (Con), DHAR-OX (OX), and DHAR-KD (KD) leaves prior to and after 30 d of exposure to 100 ppb ozone for 4 h/d. Measurements were made with three independent replicates of leaves pooled from independent plants and the average and sd reported. Leaf 1 represents the youngest expanding leaf for each measurement so that leaves at similar developmental states could be compared before and after the ozone treatment.