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Elevated Carbon Dioxide and Ozone Effects on Peanut: I. Gas-Exchange, Biomass, and Leaf Chemistry

USDA-ARS, Plant Science Research Unit, and Dep. of Crop Science, North Carolina State Univ., 3127 Ligon St., Raleigh, NC 27607. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the USDA or the North Carolina Agric. Res. Serv

View larger version (22K): [in this window] [in a new window]   Figure 1. Effects of CO2 and O3 on average net photosynthesis (A) of upper canopy leaves of peanut from 8 through 19 wk after planting in the 2-yr experiment (A, B). Seasonal average A is also shown (C). Treatments included charcoal-filtered air (CF)–ambient CO2 (CF-375) (control), CF air plus 355 µmol CO2 mol–1 (CF-730), nonfiltered air (NF)–ambient CO2 (NF-375), NF air plus 355 µmol CO2 mol–1 (NF-730), NF air plus 634 µmol CO2 mol–1 (NF-1009), 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). Values above the bars in panel C indicate percentage of the control treatment. Significant treatment effects are indicated as P 0.05 (*), P 0.01 (**), and P 0.001 (***).

View larger version (25K): [in this window] [in a new window]   Figure 2. Effects of CO2 and O3 on average stomatal conductance (gs) of upper canopy leaves of peanut from 10 through 19 wk after planting in the 2-yr experiment (A, B). Seasonal average gs is also shown (C). Treatments were charcoal-filtered air (CF)–ambient CO2 (CF-375) (control), CF air plus 173 µmol CO2 mol–1 (CF-548), CF air plus 355 µmol CO2 mol–1 (CF-730), nonfiltered air (NF)–ambient CO2 (NF-375), NF air plus 173 µmol CO2 mol–1 (NF-548), NF air plus 355 µmol CO2 mol–1 (NF-730), NF air plus 634 µmol CO2 mol–1 (NF-1009), 1.5 x ambient O3–ambient CO2 (OZ-375), 1.5 x ambient O3 plus 173 µmol CO2 mol–1 (OZ-548), 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). Values above the bars in panel C indicate percentage of the control treatment. Significant treatment effects are indicated as P 0.05 (*), P 0.01 (**), and P 0.001 (***).

View larger version (23K): [in this window] [in a new window]   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).