Inhibition of gibberellin biosynthesis by nitrate in Gibberella fujikuroi

Gibberellin production in Gibberella fujikuroi starts upon exhaustion of the nitrogen source. To determine the role of nitrate and ammonium in the regulation of gibberellin biosynthesis we have isolated mutants that cannot use nitrate as a nitrogen source. Nitrate inhibited partially the production...

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Bibliographic Details
Published inFEBS letters Vol. 413; no. 1; pp. 35 - 39
Main Authors Sánchez-Fernández, Rocı́o, Avalos, Javier, Cerdá-Olmedo, Enrique
Format Journal Article
LanguageEnglish
Published England Elsevier B.V 11.08.1997
Subjects
Cell Division - drug effects
Gibberella
Gibberella - drug effects
Gibberella - enzymology
Gibberella - metabolism
Gibberellin
Gibberellins - biosynthesis
Inhibition
Mutation
Nitrate
Nitrate Reductase
Nitrate Reductases - metabolism
Nitrates - pharmacology
Quaternary Ammonium Compounds - pharmacology
Tungstate
Tungsten Compounds - pharmacology
Gibberellin
Nitrate
Inhibition
Gibberella
Tungstate
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Summary:Gibberellin production in Gibberella fujikuroi starts upon exhaustion of the nitrogen source. To determine the role of nitrate and ammonium in the regulation of gibberellin biosynthesis we have isolated mutants that cannot use nitrate as a nitrogen source. Nitrate inhibited partially the production of gibberellins in mutants devoid of nitrate reductase activity. The inhibition occurred whether nitrate was added before or after the onset of gibberellin production. Addition of tungstate to the wild type mimicked the results with nitrate reductase mutants. We conclude that nitrate inhibits gibberellin biosynthesis by itself, independently of the intracellular signal that conveys nitrogen availability.
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ISSN:0014-5793
1873-3468
DOI:10.1016/S0014-5793(97)00872-7