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Light and molybdenum requirements for substrate induction of nitrate reductase in cotyledons of lettuce,Lactuca sativa L.

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Biologia Plantarum

Abstract

Light was required for induction of nitrate reductase (NR, E.C. 1.6.6.1) in intact cotyledons of 2-day old seedlings ofLactuca sativa L. Molybdate strongly enhanced efficiency of induction. Benzyladenine (BA), gibberellin, and succinic acid-2,2-dimethylhydrazide reduced the enzyme activity. BA thrice enhanced incorporation of labelled leucine to the protein fraction. (2-chloroethyl)trimethylammonium chloride did not affect NR activity and markedly inhibited greening and protein synthesis. KNO3 stimulated protein synthesis as well as growth of the cotyledons.

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Abbreviations

Alar or B-9:

succinic aoid-2,2-dimethylhydrazide

BA:

N6-benzyladenine

CCC:

(2-ohloroethyl)trimethylammonium chloride

CAP:

chloramphenicol

CHI:

cycloheximide

FU:

5-fluorouraoil

GA3 :

gibberellic acid

NR:

nitrate reduotase

NRA:

NR activity

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Knypl, J.S., Janas, K.M. Light and molybdenum requirements for substrate induction of nitrate reductase in cotyledons of lettuce,Lactuca sativa L.. Biol Plant 21, 214–219 (1979). https://doi.org/10.1007/BF02884572

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