Abstract
Phytotoxic effects of air pollutants are well known. In experiments with relatively higher concentration of pollutants, reduction in plant growth and productivity and visible injuries such as chlorosis and necrosis have been frequently observed. However, in the ambient atmosphere, air pollutants exist at low concentrations and at these concentration they may not induce any visible damage, although they may interefere with several metabolic or enzymic activities of the plants (Srivastava, 1978). Since hormones play an important role in growth and differentiation of plants and they also modify metabolic or enzymic activities, very often the effects of air pollutants on plants are interpreted in terms of changes in hormonal metabolism. In addition, applicalion of exogenous hormones modifies the effects of air pollutants on plants by interferring with the normal growth and metabolism. The present review relates to these interactions of air pollutants and hormones.
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