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Plant and Cell Physiology, 1995, Vol. 36, No. 7 1399-1403
© 1995

Short Communication

Regulation of Nitrate Reductase Activity by Nitrate during Light-Dark Transition in Detached Oat Leaves

Marina Rouby, Fernando Ponce-Villacís, Alicia Córdoba and Juana Kenis

Cátedra de Fisiología Vegetal. Facultad de CEFy Naturales. Universidad Nacional de Córdoba Casilla de Correo 395, 5000 Córdoba, Argentina

In oat (Avena sativa L. cv. Suregrain) leaf segments, light-dark modulation of nitrate reductase (NR) activity could be observed only when segments were kept in –NO3 conditions. We present here evidence that nitrate would regulate NR activity by modulating the phosphorylation status of the enzyme.

(Received June 19, 1995; Accepted August 14, 1995)
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