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Plant Physiology 100:1184-1188 (1992)
© 1992 American Society of Plant Biologists

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Metabolism and Enzymology

Regulation of Gibberellin Biosynthesis in Gibberella fujikuroi1

Reyes Candau2, Javier Avalos and Enrique Cerdá-Olmedo

Departamento de Genética, Universidad de Sevilla, Sevilla, Spain

Gibberellin production by Gibberella fujikuroi started only after the nitrogen source was depleted and ceased upon its renewal. Nitrogen repression of gibberellin biosynthesis is not an indirect effect of the growth arrest that follows the depletion of an essential nutrient because gibberellins were not produced upon depletion of phosphate. Mycelia produced gibberellins when suspended in a glucose solution. Production ceased some time after depletion of glucose and resumed upon its readdition. Under certain conditions, the gibberellin production rate was inversely proportional to the glucose concentrations. The specific regulation of gibberellin biosynthesis by the nitrogen source imposes a revision of the concept that gibberellins are secondary metabolites whose production is triggered by imbalance or cessation of growth.

2 Present address: Institut für Molekularbiologie und Tumorforschung, Universität Marburg, Emil-Mannkopff-Strasse 2, D-3550 Marburg, Germany.

1 Supported by Fundación Ramón Areces (Madrid), the European Biotechnology Action Programme, and Dirección General de Investigación Científica y Tecnológica (grant No. PB90-0879).




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 Appl. Environ. Microbiol.Home page
R. Rodriguez-Ortiz, M. C. Limon, and J. Avalos
Regulation of Carotenogenesis and Secondary Metabolism by Nitrogen in Wild-Type Fusarium fujikuroi and Carotenoid-Overproducing Mutants
Appl. Envir. Microbiol., January 15, 2009; 75(2): 405 - 413.
[Abstract] [Full Text] [PDF]


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Copyright © 1992 by the American Society of Plant Biologists