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Transport and Assimilation of Nitrogen by Stichococcus bacillaris Grown in the Presence of Methionine Sulfoximine ¹

Department of Botany, University of Toronto, Toronto, Ontario M5S 1A1, Canada

Stichococcus bacillaris Naeg., a green soil alga, can grow in the presence of methionine sulfoximine (MSX), an inhibitor of glutamine synthetase, by maintaining a high level of NADPH-glutamate dehydrogenase activity. MSX-grown cells can utilize both NH₄⁺ and NO₃^– as nitrogen source for growth. [¹⁴C]Methylammonium is not metabolized by S. bacillaris, and is transported by a carrier system that obeys Michaelis Menten kinetics, and is insensitive to MSX.