Kinetic studies of certain anti-gibberellins

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Abstract
Evidence is presented indicating that Phosfon-D and chlorocholine chloride (CCC) exert their inhibitory effects in the stem rather than in the roots. Kinetic analyses are presented demonstrating that Phosfon-D and CCC interact competitively with gibberellin on stem growth. It is concluded that Phosfon-D and CCC act to retard stem elongation by partially blocking the system which provides active gibberellin to the growth mechanism. The inhibition of stem growth by maleic hydrazide is shown to be independent of the promoting effect of gibberellin. The problem of interpretation and definition of growth factor and anti-metabolite action in the complex growth system is briefly discussed.