TRANSLOCATION OF EXOGENOUS GROWTH-REGULATORS IN THE BEAN SEEDLING

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Abstract
Previous investigations have shown that movement of 2,4-dichlorophenoxyacetic acid from the leaf to the stem of bean seedlings is dependent upon the existence of environmental conditions favorable for photosynthesis and it has been suggested that its transport is associated with concurrent translocation of organic food materials. Further evidence for this view is now presented through the demonstration that movement of the growth-regulator will occur in the absence of photosynthesis if sugar is supplied artificially to the leaf. The effect is not specific with regard either to the sugar or to the growth-regulator, being found with sucrose, glucose, fructose, maltose, lactose and galactose, and with the following diverse growth-regulators 2,4-dichlorophenoxyacetic acid, 2,4-D morpholine salt, indole-3-acetic acid, beta-hydroxyethyl-4-chlorophenbxyacetate, p-chlorophenyl 2,4,5-trichlorophenoxy-acetate, 4-chlorophenoxyacetamide, 2-bromo-3,5-dichloro-benzoic acid, and N-(2,4-dichlorophenoxyacetyl)-urea.