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Plant and Cell Physiology, 1973, Vol. 14, No. 6 1151-1156
© 1973

Article

Occurrence of nitrite reductase in citrus leaves1

A. Shaked, A. Bar-Akiva and K. Mendel

Division of Citriculture, The Volcani Center Bet Dagan, Israel

Evidence is presented for the presence of nitrite reductase in citrus leaves. The enzyme has a Km for nitrite of 45 mu and is inhibited by cyanide. However, unlike citrus nitrate reductase (l), it is probably not a metalloflavo protein, although it may be related to iron.

In addition to the enzymatic nitrite reduction, non-enzymatic nitrite reduction was present in citrus leaf preparations. Under in vivo assay conditions nitrite reduction in one-month-old leaves was not inhibited by cyanide, in contrast with three-month-old leaves in which nitrite reduction was almost completely inhibited. Thus it appears that in very young citrus leaves most of the nitrite reduction is non-enzymatic.

1 Contribution from The Volcani Center, Agricultural Research Organization, P. O. B. 6, Bet Dagan, Israel. Series 1972.........2256 AE.

(Received November 28, 1972; )
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