Abstract
Effects of bauxite and cement dusts on Amaranlhus dubius and Phaseolus vulgaris leaves were studied at cellular and ultrastructural levels. Talc, an inert dust, was used as a reference material. Dusted and control leaf tissues were processed, sectioned and examined light- and electron-microscopically. Naturally senescing leaves were also studied for comparison and understanding of the effects of particulates. While talc caused no alterations, both bauxite and cement induced variable cellular and ultrastructural alterations in the dusted leaves, indicating activation of wound-repair and/or defence mechanisms and premature senescence. These alterations were more pronounced in Phaseolus than in Amaranlhus. In addition, stress-related alterations were detected in bauxite-dusted Phaseolus leaves.
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