Abstract
An examination was made of the effects of p-aminophenol (PAP) treatment individually and in combination with its parent compound, p-nitrophenol (PNP), on growth and metabolic activities of a microalga, Chlorella vulgaris, and two cyanobacteria, Nostoc linckia and Nostoc muscorum, all isolated from soil. Comparatively, the cyanobacteria were more sensitive to the phenol treatments. All but the lowest (2 μg ml −1) PAP treatments inhibited cell number, chlorophyll a, and total carbohydrate production, 14CO 2 uptake, and nitrate reductase and nitrogenase activity. The algistatic effect in C. vulgaris caused by PAP could not be reverted even in the presence of acetate (0.1%). However, the inherent toxic effect of PNP established toward the alga and cyanobacteria was found alleviated in the presence of PAP only at lower concentrations. Transmission electron microscopy revealed many cytological abnormalities in Chlorella vulgaris under the influence of the selected phenols, indicating that the toxicants directly interfere with membrane properties and enzymes.
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