Auxin and gibberellin-like substances synthesis by Fusarium isolates pathogenic to corn seedlings

The four isolates studied produced considerable amounts of auxin in media with tryptophan and two of them produced also considerable amounts in tryptophan-free media. The quantity of auxin synthesized increased with decreasing pathogenicity of the fungi. All of them produced also considerable amounts of gibberellin-like substances. There was no clear reaction between the production of the above substances and the pathogenicity.