Plant Physiol. Drug Metab Dispos
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Plant Physiology 88:477-482 (1988)
© 1988 American Society of Plant Biologists

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Environmental and Stress Physiology

Depression of Photosynthesis, Growth, and Yield in Field-Grown Green Pepper (Capsicum annuum L.) Exposed to Acidic Fog and Ambient Ozone 1

Brent K. Takemoto, Andrzej Bytnerowicz and David M. Olszyk

Statewide Air Pollution Research Center, University of California, Riverside, California 92521

The relationship among physiological, injury, growth, and yield responses was examined in field-grown green pepper (Capsicum annuum L. `California Wonder') subjected to two airborne environmental stresses. The primary objectives were to determine if the stresses could cause alterations in the plant responses, and to determine if any stress induced alterations in physiological or injury responses were correlated with effects on growth or yield. Responses were monitored in green pepper exposed to simulated acidic fog alone, or in combination with ambient concentrations of ozone in open-top field chambers. Both highly acidic fog and ambient ozone depressed green pepper growth and yield responses via the inhibition of photosynthesis. Applications of highly acidic fog (i.e. two exposures of pH 1.68 fog per week for 11 weeks) caused a significant depression of net photosynthesis, reduction in leaf buffering capacity, and an extensive amount of leaf injury. These alterations closely paralleled decreases in growth and yield on a percentage basis. In contrast, ambient ozone had similar impacts on net photosynthesis, growth and yield, but enhanced leaf buffering capacity, and caused no visible injury. The pollutant-specific differences in plant response are discussed with respect to whole-plant carbon metabolism and physiological compensation.

1 Sponsored in part by funds from the California Air Resources Board, Contract A5-087-32. The statements and conclusions in this manuscript are those of the University of California, and not necessarily those of the California Air Resources Board. The mention of commercial products, their source, or their use in connection with materials reported herein is not to be construed as either an actual or implied endorsement.






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Copyright © 1988 by the American Society of Plant Biologists