Abstract
ABSTRACTFifteen nitrate assimilation‐deficient mutants of the euryhaline green alga, Dunaliella tertiolecta Butcher were selected by their chlorate resistance. Ten mutants, unable to grow on NO3− but able to grow on NO2−, had no detectable nitrate reductase activity. Five mutants, unable to grow on either NO3− or NO2−, had depressed levels of both nitrate and nitrite reductase. A method for assaying methyl viologen‐nitrate reductase in the presence of nitrite reductase is described.
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