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Plant and Cell Physiology, 1985, Vol. 26, No. 5 957-960
© 1985

Short Communication

Differential Effects of Methionine Sulfoximine on Light and Dark Uptake of Nitrate by Anabaena cylindrica

Masayuki Ohmori1 and Kazuko Ohmori2

1 Ocean Research Institute, University of Tokyo Minamidai 1-15-1, Nakano-ku, Tokyo 164, Japan
2 Faculty of Domestic Sciences, Showa Women's University Taishido 1-7, Setagaya-ku, Tokyo 154, Japan

Methionine sulfoximine (MSX), a glutamine synthetase inhibitor, suppressed the inhibitory effect of ammonia on nitrate uptake by Anabaena cells in both the light and dark. In the light, MSX did not inhibit nitrate uptake in the absence of ammonia, but under dark conditions, MSX above 2 µM inhibited nitrate uptake. Nitrite uptake, which is not affected by ammonia in either the light or the dark, was inhibited by MSX in the dark but not in the light.

(Received October 3, 1984; Accepted April 22, 1985)
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