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IMPACT OF O3 ON LEAF CONSTRUCTION COST AND CARBON ISOTOPE DISCRIMINATION
Citation:
Tingey, D., W. Hogsett, K. Rodecap, E. Lee, AND T. Moser. IMPACT OF O3 ON LEAF CONSTRUCTION COST AND CARBON ISOTOPE DISCRIMINATION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-94/509 (NTIS PB95148714).
Description:
Plant response to ozone (O3) is controlled by the interactive balance between avoidance and intolerance processes. ush bean (Phaseolus vulgaris L.) plants were exposed to O3 in open-top field-exposure chambers in early and late season studies at Corvallis, Oregon. lants were grown in cultural systems that permitted the daily measurement of plant water use and exposed to episodically occurring levels of O3 throughout the growing seabon. ozone impaired plant growth and reduced yield. he reduced growth and yield represented the integrated responses of carbon and energy available for growth and carbon and energy losses required to repair or compensate for O3 impacts. zone increased the construction cost of leaf tissue. he avoidance processes and their contribution to reduced carbon availability were inconclusive. t appears that O3 had a minimal effect on stomatal conductance based on cumulative transpiration and water use efficiency (WUE) although O13C values increased. zone significantly increased the amount of H2O lost from the plants in relation to the net C assimilated.