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Relationships Among Injury, Growth, and Yield Responses of Soybean Cultivars Exposed to Ozone at Different Light Intensities¹

ABSTRACT

Four soybean cultivars (Glycine max (L.) Merr. cv. Forrest, Davis, Ransom, and Bragg) differing in foliar sensitivity and shoot weight response to O₃ during vegetative growth were exposed to O₃ from the seedling stage to maturity to determine if the yield response correlated with the vegetative response. Neither the foliar injury nor the vegetative shoot weight response of cultivars to O₃ allowed reasonable prediction of the cultivar yield response to O₃. This inadequacy may relate to differences in cultivar tolerance. Bragg, with moderate amounts of O₃-induced injury and with decreased growth, yielded as well as the controls. Davis, with moderate amounts of O₃-induced injury and decreased growth, yielded 34% less than the controls. The four cultivars were grown in open-top field chambers with different degrees of shading to determine whether light intensity would alter their response to O₃. Light intensity in nonshaded open-top chambers was 9% less than that in an open field; chambers with shade cloth covering the sides or tops decreased light intensity by 15 and 19%, respectively. The shade treatments did not change overall yield response to O₃ or the relative cultivar yield response to O₃.

Key Words: open-top field chambers • air pollution

¹ Cooperative investigations of the USDA and North Carolina State University. Paper no. 8185 of the Journal Series of the North Carolina Agrcultural Research Service, Raleigh.

² Research Plant Pahtologist, USDA-ARS, Plant Pathology Dep., North Carolina State University, Raleigh, NC 27650; and Research Assistant, Plant Pathology Dep., North Carolina State Univ.; respectively.

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