Abstract
The effects of four growth-regulating substances, viz. indole acetic acid, gibberellic acid, 2, 4-dichlorophenoxy acetic acid, and naphthalene acetic acid on the linear growth of Penicillium herquei, Fusarium nivale, Thielavia terricola, and Cunninghamella echinulata were studied. Gibberellic acid at 400 p.p.m. did not reduce fungal growth, whereas the remaining substances at this rate inhibited fungal growth completely. Certain concentrations of the latter substances reduced while others had no influence on growth rate. Gibberellic acid at 1 and 5 p.p.m. was the only substance causing some stimulation of Fusarium nivale. Neither this stimulation nor the inhibition in other cases was constant with regard to growth-regulating substances and fungal species. In general, low concentrations of the growth-regulating substances had no effect on the growth of any of the fungi tested while high concentrations mostly inhibited growth to various extents.
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