Effect of Heavy Metals on Morphology, Growth and Pigment Contents of Microalgae Isolated from Industrial Effluents

Jyothi Miranda, G. Krishnakumar


The microalgae Oscillatoria laete-virens (Grouan) Gomont, Oscillatoria trichoides Szafer, Chroococcus multicolouratus Wood and Oedogonium sp. isolated from industrial wastewater, were studied for their resistance to three metal ions, Pb2+, Cr6+ and Cu2+. The effect of different concentrations of these metals on morphology, growth and photosynthetic pigment contents was studied. Metals inhibited the growth in a dose dependent manner. Chlorophyll-a and carotenoid contents decreased with increasing metal concentrations. The growth of these microalgae was severely inhibited by Cu2+ compared to Cr6+ and Pb2+. The order of resistance to metals in terms of growth and pigment contents was Pb2+>Cr6+>Cu2+. Lethal concentration (LC50 for 288 hr ) values also indicated that the tested microalgae are more vulnerable to Cu2+ than Cr6+ and Pb2+.


Carotenoids; Chroococcus multicolouratus; Chlorophyll-a; Chromium; Copper; Oscillatoria laete-virens; Oscillatoria trichoides; Oedogonium sp.; lead

Full Text: PDF


  • There are currently no refbacks.

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.

COPYRIGHT of this Journal vests fully with the National Instional Institute of Ecology. Any commercial use of the content on this site in any form is legally prohibited.