Abstract
We exposed trembling aspen ( Populus tremuloides Michx.) clones differing in trophospheric ozone (O 3) tolerance in various open-top chamber studies for three growing seasons, and examined the effects of O 3, CO 2, and O 3 + CO 2 on growth and physiological processes. Ozone in the range of 80 ppm hr (Sum 00) per growing season decreased height, diameter, and stem and leaf biomass slightly in a tolerant clone but severely in a sensitive clone. Elevated CO 2 (150 ppm over ambient) did not compensate for the O 3 effects. Antioxidant enzyme analysis showed elevated SOD levels in the tolerant clone but not in the sensitive clone following O 3 exposure. Northern blot analysis indicated that the chloroplastic and cytosolic Cu/Zn SOD's were significantly increased in response to O 3 in the tolerant but not the sensitive clone. Currently, we are conducting molecular analysis to determine the functional significance of SOD's in regulating O 3 tolerance in aspen.
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