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BIOLOGICAL EFFECTS OF A MERCURY FUNGICIDE ON A N 2 ‐FIXING BLUE‐GREEN ALGA NOSTOC MUSCORUM : ISOLATION AND PRELIMINARY CHARACTERIZATION OF A Hg‐RESISTANT MUTANT
Author(s) -
PRASAD A. B.,
SAMANTA R.,
VISHWAKARMA M. L.,
VAISHAMPAYAN A.
Publication year - 1986
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1986.tb00796.x
Subject(s) - mercury (programming language) , mutant , nostoc , fungicide , botany , biology , intracellular , chemistry , biochemistry , cyanobacteria , bacteria , gene , genetics , computer science , programming language
S ummary Mercuric chloride, which is used as a fungicide in tropical paddy‐fields, inhibits growth (in N 2 , i.e. molecular nitrogen, and 5 mM KNO 3 media) and heterocyst formation (in N 8 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 N 2 medium. It is suggested that a Hg‐inducible protein/enzyme system is responsible for the intracellular mercury‐resistance of this mutant.