OZONE AND SULPHUR DIOXIDE INTERACTION IN WHITE BEAN AND SOYBEAN

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Abstract
White bean (Phaseolus vulgaris L.) and soybean (Glycine max L. Merr.) plants were exposed to 15 pphm (v/v) ozone and/or 7.5, 15, 30, 45 or 60 pphm sulphur dioxide for 5 or 10 days in controlled environment facilities. Ozone-induced leaf injury consisted of bronze flecking on mature leaves of both species. Sulphur dioxide caused bifacial necrotic lesions on mature leaves of some white bean plants exposed to 60 pphm and had no effect on soybean leaves. The combined gases on white bean resulted in leaf injury symptoms consisting of yellow interveinal chlorosis which appeared several days later than did bronzing on corresponding leaves exposed to ozone alone. In soybean, characteristic ozone-induced lesions appeared on leaves of plants exposed to the combined gases but the onset of injury was several days later than in plants exposed only to ozone. Both injury ratings and plant weight data corresponded to the observed injury pattern.
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