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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.

Additional keywords: air pollution, stomata, Nicotiana, TMV, bean.