Journal of Stress Physiology & Biochemistry, Vol. 12 No. 2 2016, pp. 62-71 ISSN 1997-0838
Original Text Copyright (cc) 2016 by  Saleh

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QueryDate : 2016-12-24
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Lead (Pb) heavy metal impacts in the green Ulva lactuca (Chlorophyceae) marine algae

B. Saleh

  Department of Molecular Biology and Biotechnology, AECS, P.O. Box 6091, Damascus, Syria.


Received May 5, 2016

Toxicity of different lead (Pb) (0, 2, 4 and 8 mg/L) concentrations in the green Ulva lactuca (Chlorophyta) marine algae at physiological level has been investigated 48 h after Pb treatment under laboratory conditions. Thalus algae damages followed Pb treatment as revealed by microscopy test showed that the 4 and 8 mg/L Pb caused morphological changes in cells viability; whereas, no effect observed at the lowest Pb applied concentration (2 mg/L). Data revealed that Pb stress caused reduction in most investigated physiological parameters i.e. Pigments content, osmotic potential and membrane stability index values. This decline in osmotic potential was significantly (p ≤ 0.001) different. Whereas, estimated electric conductivity (EC) values increased significantly (p ≤ 0.001) as applied Pb concentration increased. The current study allowed somewhat to highlight and better understanding Pb impacts in U. lactuca algae. Thereby, the studied algae could be used as a useful bioindicator in Pb polluted ecosystems.

Key words:    Ulva lactuca Algae, Physiological parameters, Lead (Pb) toxicity, Heavy metals

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