Auxin Gibberellic Acid Interaction in Controlling the Hypocotyl Growth in Seedlings

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Science  28 Apr 1961:
Vol. 133, Issue 3461, pp. 1357-1359
DOI: 10.1126/science.133.3461.1357


High concentrations of indole-3-butyric acid, when applied at a concentration of 100 to 200 parts per million (ppm) to presoaked seeds, cause a marked inhibition of hypocotyl length in the seedling growth of Phaseolus mungo var. T-2. Gibberellic acid, when applied at a concentration of 5 ppm, quantitatively reversed this inhibition. It is suggested that the interaction between these two growth substances controls the morphogenetic differentiation in regard to hypocotyl formation in seedling growth.