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Plant Physiology 94:1696-1701 (1990)
© 1990 American Society of Plant Biologists

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Metabolism and Enzymology

Light-Stimulated Gibberellin Biosynthesis in Gibberella fujikuroi1

Stephen W. Johnson2 and Ronald C. Coolbaugh3

Department of Botany, Iowa State University, Ames, Iowa 50011

Gibberellins (GAs) are a group of plant growth hormones that were first isolated from the fungus Gibberella fujikuroi. The biosynthesis of GA in liquid cultures of the fungus has been examined using high-performance liquid chromatography and combined gas chromatography-mass spectrometry. GA3 was the predominant GA in well-aerated cultures. GA4 and GA7, intermediates in GA3 biosynthesis, accumulated in cultures with low levels of dissolved oxygen, but were not detectable in more highly aerated cultures. Light stimulated the production of GA3 in G. fujikuroi cultures grown from young stock cultures. Cell-free enzyme studies revealed a significant stimulation in the levels of kaurenoic acid oxidation in cultures grown in the light in comparison with those grown in the dark. However, measurements of the relative rates of [14C]mevalonic acid incorporation into kaurene showed no effect of light on this early part of the pathway. Preliminary experiments indicated that blue light is most effective in enhancing kaurenoic acid oxidation.

2 Present address: International Seeds Inc., P.O. Box 168, 820 First Street, Halsey, OR 97348.

3 Present address: Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907.

1 This research was supported in part by National Science Foundation Grants PCM 8415924 and DMB 8703865.






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