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  • Title: BIOLOGICAL EFFECTS OF A MERCURY FUNGICIDE ON A N2 -FIXING BLUE-GREEN ALGA NOSTOC MUSCORUM: ISOLATION AND PRELIMINARY CHARACTERIZATION OF A Hg-RESISTANT MUTANT.
    Author: Prasad AB, Samanta R, Vishwakarma ML, Vaishampayan A.
    Journal: New Phytol; 1986 Jan; 102(1):45-49. PubMed ID: 33873891.
    Abstract:
    Mercuric chloride, which is used as a fungicide in tropical paddy-fields, inhibits growth (in N2 , i.e. molecular nitrogen, and 5 mM KNO3 media) and heterocyst formation (in N8 medium) in the blue-green alga Nostoc muscorum at a concentration of 0.3 μg ml-1 and above. These inhibitory effects were reversed on supplementation with 3 mM exogenous glucose. A mercury resistant mutant of this alga has been obtained, which is stable through repeated cell transfers in N2 medium. It is suggested that a Hg-inducible protein/enzyme system is responsible for the intracellular mercury-resistance of this mutant.
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