Abstract
Experiments on the effects of chronic ozone exposure (0.05 ppm daily for 6 h) and infection with rust fungus on bean plants required the development of a method for quantitative assessment of injury. The diffuse nature of chronic injury precluded accurate visual assessment, but measurements of spectral reflectance of the upper leaf surface were found to yield precise and reproducible differences as a result of ozone treatment. Chlorophyll estimation following extraction lacked adequate precision. The usefulness of reflectance measurements is discussed in the light of the symptomatology of chronic injury and senescence of the affected leaves. Such measurements are minimally affected by rust infection.
Published Version
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