Effect of Temperature on Stomatal Conductance and Ozone Injury of Pinto Bean Leaves. C. A. Miller, Graduate Student, Department of Plant Pathology and Center for Air Environment Studies, Pennsylvania State University, University Park 16802. D. D. Davis, Associate Professor, Department of Plant Pathology and Center for Air Environment Studies, Pennsylvania State University, University Park 16802. Plant Dis. 65:750-751. Accepted for publication 26 January 1981. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-750.

Phaseolus vulgaris ‘Pinto 111’ unifoliolate leaves exposed to 0.10 ppm (196 µg/m³) of ozone for 3 hr at 15, 24, and 32 C developed 25, 3, and 24% foliar injury, respectively. Stomatal conductance of both exposed and unexposed leaves was lowest at 15 C, intermediate at 24 C, and greatest at 32 C. Exposure to ozone significantly reduced stomatal diffusion at 32 C but not at 24 or 15 C.