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. 1989 Nov;1(11):1111–1120. doi: 10.1105/tpc.1.11.1111

Nitrate Reductase mRNA Regulation in Nicotiana plumbaginifolia Nitrate Reductase-Deficient Mutants.

S Pouteau 1, I Cherel 1, H Vaucheret 1, M Caboche 1
PMCID: PMC159847  PMID: 12359888

Abstract

Light and substrate regulation of nitrate reductase (NR) expression were compared in wild type and mutant lines of Nicotiana plumbaginifolia. Mutants affected in the NR structural gene (nia) or in the biosynthesis of the NR molybdenum cofactor (cnx) were examined. nia mutants expressing a defective apoenzyme, as well as cnx mutants, overexpressed NR mRNA, whereas nia mutants devoid of detectable NR protein had reduced or undetectable NR mRNA levels. Diurnal fluctuations of NR mRNA were specifically abolished in nia and cnx mutants, suggesting that the integrity of NR catalytic activity is required for the expression of diurnal oscillations. Unlike some fungal mutants, the nia and cnx mutants examined retained nitrate inducibility of NR expression. The possibility of autogenous control of NR expression in higher plants is discussed.

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Selected References

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