Physiological effects of some heavy metals on blue green alga oscillatoria amoena (Kuetz. Gomont)‎

الملخص EN

The effect of Co++ and Cd++ on the growth rate and photosynthesis efficiency of bluegreen alga Oscillatoria amoena was studied under controlled laboratory conditions.

These metals were treated with alga at different concentrations media (1, 2 and 5 ppm) of both elements.

The growth rate of alga was inhibited by different concentrations of metals.

Cd++ was more toxic than Co++.

The results concerning the effects of different concentrations of heavy metals on photosynthesis (O2 evolution) has shown reduction of the amount of O2 evolution by alga in response to the increase of Cd++ and Co++ concentrations, photosynthesis was more sensitive to Cd++ concentration than to that of Co++.