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The effect of heavy metals on the cytoplasmic fine structure of skeletonema costatum bacillariophyta



The effect of heavy metals on the cytoplasmic fine structure of skeletonema costatum bacillariophyta



Protoplasma 116(1): 14-23



The marine diatom S. costatum (Greville) Cleve was grown in batch culture in the presence of Hg (6.5 .mu.g 1-1), Cd (50 .mu.g 1-1) and Zn (265 .mu.g l-1). Alterations in cytoplasmic morphology were observed in cells treated with these sublethal concentrations of the metals. Swollen organelles, dilated membranes and vacuolated cytoplasm indicated plasma membrane damage and subsequent osmotic disorganization. Electron-dense inclusions in vesicles, multivesiculate bodies and cytoplasmic tubules apparently derived from the Golgi body are interpreted as mechanisms of sequestering the metals. Hg and Zn had a marked effect on the fine structure whereas treatment with Cd resulted in little to no cytoplasmic damage. [Applications of this research to water pollution were discussed.].

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Accession: 006645120

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