Effect of some (2-chloroethyl) trimethylammonium chloride analogs and other growth retardants on gibberellin biosynthesis in Fusarium moniliforme.

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Abstract
Three analogs of the growth retardant (2-chloroethyl) trimethylammonium chloride (CCC) which have a strong growth-inhibiting effect in higher plants were also highly effective in selective suppression of gibberellin biosynthesis in Fusarium moniliforme. An analog with measureable but low growth-inhibiting activity was effective in suppressing gibberellin biosynthesis in the fungus, but only partially and only at higher concentrations. Three compounds inactive on growth of higher plants were also inactive with respect to gibberellin biosynthesis in Fusarium. It is concluded that those effects of CCC, and probably also of AMO-1618, on growth and development in higher plants which can be overcome by added gibberellin are based on an inhibition of gibberellin biosynthesis in the plant. The effect of the CCC analogs on GA biosynthesis was the same in 2 different strains of Fusarium, differing in the character of the gibberellins produced. CCC-treated Fusarium cultures did not convert appreciable amounts of kaurene, kauranol, and steviol into gibberellin. Tributyl-2,4-dichlorobenzylphosphonium chloride (Phosfon D) was rapidly degraded in cultures of Fusarium.