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Injury to Sweet Corn Inbreds and Hybrids by Air Pollutants in the Field and by Ozone Treatments in the Greenhouse¹

ABSTRACT

Five inbreds of Zea mays L. and three of their F₁ hybrids were grown in the field under natural summer air pollution conditions in 1971. During the following fall, four of the inbreds and two hybrids were grown in greenhouses and received controlled ozone treatments. The cultivars showed highly significant differences in injury under field conditions, but much smaller differences in the greenhouse tests. In the field, four inbreds were relatively resistant; the fifth was highly susceptible. The three hybrids showed some correlation with the resistance of their parents. In the greenhouse, with repeated dosages of ozone, all tested inbreds showed substantial damage when 4 to 7 weeks old, but at flowering the field-susceptible inbred was the most severely damaged. The hybrids also showed severe damage as young plants, while at flowering their damage from greenhouse treatments was related to their field susceptibility. Injury symptoms in the field were typical of the ozone injury in the greenhouse. In all cultivars, young leaves were less injured than fully mature leaves.

Key Words: plant and leaf age • high temperature

¹ Contribution from the Department of Plant Sciences and the Statewide Air Pollution Research Center (SAPRC), Univ. of California, Riverside 92502.

² Professor of Horticultural Science, and Horticulturist and Associate Director (SAPRC), respectively.

Received for publication August 7, 1972.