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Plant Physiology 79:1125-1126 (1985)
© 1985 American Society of Plant Biologists

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

Iftikhar Ahmad and Johan A. Hellebust

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.

1 Supported by Grant A6032 from the Natural Sciences and Engineering Research Council of Canada.






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Copyright © 1985 by the American Society of Plant Biologists