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On Exclusion as the Mechanism of Ozone Resistance in Virus-Infected Plants. Eileen Brennan, Associate Research Professor, Department of Plant Biology, Cook College, Rutgers University-The State University of New Jersey, New Brunswick 08903; Phytopathology 65:1054-1055. Accepted for publication 12 April 1975. DOI: 10.1094/Phyto-65-1054.

The resistance to O₃ of TMV-infected plants cannot be attributed to stomatal closure such as occurs in resistant cultivars of onion. Leaf resistance, as measured with a diffusion porometer, was similar in virus-infected and noninfected tobacco and bean plants both before and after exposure to the pollutant. Exclusion of O₃ is therefore not the principal factor in reducing O₃ toxicity symptoms.