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The Effect of Ozone on Chloroplast Lamellae and Isolated Mesophyll Cells of Sensitive and Resistant Tobacco Selections. A. Rhoads, Plant Pathologist, Morris Arboretum, 9414 Meadowbrook Avenue, Philadelphia, PA 19118; E. Brennan, professor, Department of Plant Pathology, Cook College, Rutgers, The State University, New Brunswick, NJ 08903. Phytopathology 68:883-886. Accepted for publication 25 November 1977. Copyright 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-883.

Ozone treatment of whole tobacco leaves affected chloroplast electron transport in proportion to the degree of visible leaf injury resulting on either the sensitive or resistant selection. When chloroplasts were isolated from Bel-W3 (ozone-sensitive) and Bel-B (ozone-resistant) tobacco leaves and exposed to identical ozone doses in vitro, however, inhibition of electron transport was similar in both. Likewise, enzymatically-isolated leaf mesophyll cells were equally sensitive to in vitro ozone treatment. The differential ozone response of Bel-W3 and Bel-B tobacco was not expressed by the isolated chloroplast lamellae or leaf mesophyll cells.