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The growth and some metabolic activities of the five species namely Chlamydomonas reinhardtii (Dang), Chlorococcum humicola (Nag), Scenedesmus obliquus (Turp) Kütz (green algae) and Anabaena circinalis (Rabh.) and Wollea saccata (Wollea Bornet and Flahault) (Blue-green algae) isolated from soil at Assiut, Egypt were investigated under various concentrations of Cd 2+ , Ni 2+ and Pb 2+ . The growth of the C. reinhardtii, C. humicola and S. obliquus were inhibited by all used heavy metals. The highest inhibitory effect was exerted by Ni 2+ or Cd 2+ , while the lowest toxicity was exerted by Pb 2+ . However, the growth was enhanced by low and medium concentrations of Pb 2+ . The toxicity of heavy metals for C. reinhardtii, C. humicola, S. obliquus and W. saccata was as follows Ni 2+ > Cd 2+ > Pb 2+ . In case of A. circinalis the toxicity of heavy metal was as follows Cd 2+ > Ni 2+ > Pb 2+ . Soluble sugars, soluble protein, free amino acids and proline of all species, exhibited a high significant increase with all tested heavy metals supplemented. Insoluble carbohydrates, were generally lowered in various treatments, of heavy metals irrespective the test algae. Key word: Green algae, Blue green algae, Cd 2+ , Ni 2+ , Pb 2+ .

DISTURBANCES IN THE SIZE OF VARIOUS METABOLIC POOLS OF SOME ISOLATED SOIL ALGAL SPECIES IN RESPONSE TO HEAVY METAL TOXICITY