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Figure 3. Effects of CO2 and O3 on chlorophyll (A) and starch (B) concentrations in upper canopy leaves of peanut from 6 through 19 wk after planting in the 2-yr experiment. Treatments shown are charcoal-filtered air (CF)–ambient CO2 (CF-375) (control), CF air plus 355 µmol CO2 mol–1 (CF-730), 1.5 x ambient O3–ambient CO2 (OZ-375), and 1.5 x ambient O3 plus 355 µmol CO2 mol–1 (OZ-730). Values are means ± SE from two or three replicate chambers per treatment in each year of the experiment (see Table 1).
