Mo-V interactions during N2- and NO 3 − -metabolism in a N2-fixing blue-green algaNostoc muscorum

Abstract

Molybdenum (Mo), a group 6B element (applied in the form of sodium molybdate at a concentration of 0.0177 ppm), is required for N2- and NO 3 − -mediated growth ofNostoc muscorum. The amount of growth of such Mo-containing culutures is significantly enhanced by the addition of 0.0125 ppm vanadium (V), an element belonging to group 5 of the periodic table (applied in the form of sodium vanadate). At concentrations above 0.0125 ppm V proves growth-inhibitory toN. muscorum cultured with or without Mo. Mo and/or V exert(s) no apparent stimulatory/inhibitory effect on NO 2 − -mediated growth of the organism.