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

Document Type : Original Article

Authors

1 Botany Department, Faculty of Science, Assiut University, Assiut, Egypt.

2 Botany Department, Faculty of Science, Taiz University, Taiz, Yemen.

Abstract

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 Cd2+, Ni2+ and Pb2+. 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 Ni2+ or Cd2+, while the lowest toxicity was exerted by Pb2+. However, the growth was enhanced by low and medium concentrations of Pb2+. The toxicity of heavy metals for C. reinhardtii, C. humicola, S. obliquus and W. saccata was as follows Ni2+ > Cd2+ > Pb2+. In case of A. circinalis the toxicity of heavy metal was as follows Cd2+ > Ni2+ > Pb2+. 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.

Keywords

References

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