Abstract
Twenty-eight species of the fungal genera Sphaceloma (imperfect stage) and Elsinoe (perfect stage) were investigated for their ability to produce gibberellins. In addition to Sphaceloma manihoticola, considerable amounts of GAs were found in the culture liquids of S. bidentis, S. menthae, S. persae and S. rhois. GA 4 was the predominating GA with concentrations of up to 20 mg l −1 of culture filtrate. GA 13, GA 14, GA 24, GA 9, GA 15, GA 25, GA 36 and GA 37 were also detected at concentrations decreasing in this sequence. No indications could be found of the presence of GA 1, GA 3, or GA 7, indicating that Sphaceloma species, in contrast to Gibberella fujikuroi, are unable to synthesize 1,2-dehydro or 13-hydroxy-GAs. Species of the genus Elsinoe were not found to produce any GA-like activity.
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