Response of Plants to Air Pollutants. I. Effects of Ozone on Tobacco Plants Preconditioned by Light and Temperature

Publisher Website
Google Scholar
Abstract
Light and temperature preconditioning caused significant effects on tobacco plants exposed to ozone in a filtered-air fumigation chamber. Two-hour fumigations at 0.20 to 0.25 ppm showed (1) a 22-hour extended photoperiod caused partial to nearly complete ozone protection; (2) severe ozone injury occurred when plants were kept in the dark 14, 42, or 66 hours before exposure. A 5[degree]C difference during the 2-week cultural period before fumigation resulted in significantly less injury to plants grown at the lower temperatures. Low temperature (5[degree]C) imposed for 12 hours before fumigation resulted in less ozone injury than high temperature (25oC).