Abstract
Two strains of Gibberella fujikuroi, i. e., G-4 and As 6-7 were selected for the production of gibberellin in the submerged culture from twenty strains through the shaken culture method with or without the test pieces of metals. It was found that the amount of gibberellin produced was smaller in presence of even the stainless steel 18-8 than in the absence.
Submerged cultures were carried out with these strains in 150 l tank made of stainless steel 18-8. As the result, the production of gibberellin was nearly estimated to be corresponding to 8μg of the pure gibberellin A per I cc of the culture medium by the bioassay method. The chemical changes during each fermentation were shown in Figures 5_??_7.
