Vanadium as a trace element in the blue‐green alga, nostoc muscorum: influence on nitrogenase and nitrate reductase
1983
VAISHAMPAYAN, A.
Molybdenum (Mo), a group VI B element (applied in the form of sodium molybdate at a concentration of 0.0177 ppm), is required for the nitrogenase and nitrate reductase activities of Nostoc muscorum and hence for growth on N2 and NO− 3. These enzymic activities, as well as the growth of Mo‐containing cultures, are significantly enhanced by the addition of 0.0125 ppm vanadium (V), an element belonging to group V (applied in the form of sodium vanadate). At concentrations above 0.0125 ppm. V addition inhibits nitrogenase and nitrate reductase activities and ultimately leads to a retardation of growth on N2 and NO− 3. Molybdenum and/or V has no effect on the growth of N. muscorum with NO− 2 as nitrogen source.
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