Enhancement of pigment concentrations in Dunaliella tertiolecta as a result of copper toxicity

The addition of copper to coastal waters through the disposal of complex effluents has been increasing. Copper is a well known algicide. It binds to the cell membrane, effects permeability mechanisms and attaches to SH on vital enzyme. In sublethal concentrations it retards log phase of growth. The ability of algae to withstand copper toxicity varies greatly. The green flagellate, Dunaliella tertiolecta has previously been shown to be highly resistant to copper. Its ability to withstand high concentrations of copper promotes growth of Dunaliella tertiolecta , possesses chlorophylls a and b, small amounts of alpha- and greater amounts of beta-carotene as well as neoxanthin, zeaxanthin and lutein. The beta-carotene content of the algae varies with the species and growth conditions. This study was undertaken to determine the effect of lethal and sublethal concentrations of copper on the growth and production of chlorophyll and carotenoids in Dunaliella tertiolecta .