Effect of hexachlorobenzene and acetone on algal growth: physiology and ultrastructure

Growth, survival and reproduction in Chlorella vulgaris and C. variegata with respect to culture age and under different chemical factors

Batch cultures of Chlorella vulgaris and C. variegata reproducing about twice every 5 d within 0-15 d had vegetative cells and autospore mother cells in the ratio of about 19 : 1. Continuous slow or negligible and/or no growth in > 15-d-old control cultures or in young cultures supplied with the antibiotics streptomycin, penicillin, amoxycillin (10-1000 ppm) or tetracycline (10, 100 ppm), and pesticides carbofuran, gammaxine, moticop or iralon (1-100 ppm) was due to slow autospore mother cells dehiscence (leading to an increase in their percentage); while negligible and/or no growth of both algal species in sewage water (100, 25%), detergent (0.1-1%), petrol or kerosene (5-20 %), benzene, toluene or phenol (5, 10%) and pesticides rogor or endosulfan (1, 10 ppm) was due to vegetative cells failure to differentiate into auto-spore mother cells (leading to decreased/zero autospore mother cells percentage) and/or rapid death of all cells. C. variegata was equally or slightly more sensitive to different chemical stress than C. vulgaris.

Effect of acetone on the toxicity of atrazine towards photosynthesis in Anabaena

The effect of acetone on the toxicity of atrazine towards photosynthesis in the blue-green algae Anabaena inaequalis, A. variabilis and A. cylindrica was investigated. The order of sensitivity to atrazine was A. inaequalis greater than A. variabilis greater than A. cylindrica. Acetone and atrazine interacted additively, antagonistically, and synergistically, depending upon the concentrations of acetone and atrazine used. The EC50 of atrazine towards photosynthesis was dependent upon the type of solvent-pesticide interaction.