Nelumbo - The Bulletin of the Botanical Survey of India

S. L. Gupta ¹

Affiliations
1 Botanical Survey of India, Howrah, IN

Abstract

The effect of different nitrogen sources on growth and copper toxicity was studied in the unicellular cyanobacterium Anacystis nidulans and Gyanophage AS-1 resistant mutant (An/AS-1). The mutant An/AS-1 was characterised by slow growth rate but was more senstitive to copper than its parent. In both the strains, the presence of high nitrate concentrations, which supported better growth of algae, reduced the algicidal effect of copper. However, other inorganic nitrogen sources such as nitrite and ammonium caused more inhibition and reduced the specific growth rate.

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S. L. Gupta ¹

Affiliations
1 Botanical Survey of India, Allahabad, IN

Abstract

Among nutrients, nitrogen and phosphorus are mainly responsible for emergence of blooms of cyanobacteria in lakes and reservoirs. The present Study indicates that in the synthetic medium umber of cells increases when P applied alone while the numbers are always less when N and P applied together. However, growth is less pronounced in the natural lake water which indicates the presence of chelating material (s).

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