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Ozone Toxicity in Tomato as Modified by Phosphorus Nutrition. Ida A. Leone, Department of Plant Biology, Rutgers University—The State University of New Jersey, New Brunswick 08903; Eileen Brennan, Department of Plant Biology, Rutgers University—The State University of New Jersey, New Brunswick 08903. Phytopathology 60:1521-1524. Accepted for publication 18 May 1970. DOI: 10.1094/Phyto-60-1521.

Ozone phytotoxicity in Rutgers tomato increased with increase in phosphorus supply, and hence with the phosphorus content of tomato foliage. Exposure to ozone was followed by increased foliar contents of phosphorus, potassium, calcium, and total nitrogen at all levels of phosphorus applied and a decrease in total carbohydrate and starch content in the foliage of low phosphorus plants. It is suggested that the carbohydrate reserve accumulated in phosphorus-deficient plants may partially explain the resistance of such plants to ozonation.