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 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.
Sánchez-Fernández
R
R
Departamento de Genetica, Universidad de Sevilla, Spain. rosan@genwet1.rug.ac.be
Avalos
J
J
Cerdá-Olmedo
E
E
D002455:Cell Division / Q000187:drug effects; D005874:Gibberella / Q000187:drug effects / Q000201:enzymology / Q000378:metabolism*; D005875:Gibberellins / Q000096:biosynthesis*; D009154:Mutation; D050901:Nitrate Reductase; D009565:Nitrate Reductases / Q000378:metabolism; D009566:Nitrates / Q000494:pharmacology*; D000644:Quaternary Ammonium Compounds / Q000494:pharmacology; D017973:Tungsten Compounds / Q000494:pharmacology
D005875:Gibberellins; D009566:Nitrates; D000644:Quaternary Ammonium Compounds; D017973:Tungsten Compounds; D009565:Nitrate Reductases; D050901:Nitrate Reductase; C045951:tungstate