DISTRIBUTION AND PREVALENCE OF VERTICILLIUM SPECIES PRODUCING SUBSTANCES WITH GIBBERELLIN-LIKE BIOLOGICAL PROPERTIES

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Abstract
One hundred and fourteen isolates of Verticillium species were tested for production of gibberellin-like substances ("gibberellins") using dwarf mutant seedlings of Zea mays. Twenty-one isolates induced statistically significant growth increases attributed to "gibberellins". Activity was observed in isolates of V. albo-atrum, V. dahliae, V. nigrescens, and V. lateritium, from various hosts, and from various locations in Canada, United States, and Great Britain. "Gibberellin" was apparently produced also by isolates of Colletotrichum, Chaetomium, Penicillium, and Rhizoctonia solani. "Gibberellin" may be produced commonly by isolates of Verticillium, and possibly by other fungi as well.Some isolates of Verticillium apparently produced substances which inhibited growth of dwarf-mutant corn seedlings.