Inhibition of gibberellin biosynthesis by nitrate in Gibberella fujikuroi
1997; Wiley; Volume: 413; Issue: 1 Linguagem: Inglês
10.1016/s0014-5793(97)00872-7
ISSN1873-3468
AutoresRocı́o Sánchez-Fernández, Javier Ávalos, Enrique Cerdá‐Olmedo,
Tópico(s)Plant nutrient uptake and metabolism
ResumoGibberellin 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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