Effect of Application of Sugar on the Translocation of Sodium 2,4-Dichlorophenoxyacetate by Bean Plants in the Dark

Abstract

1. A drop of an aqueous solution of sodium 2,4-dichlorophenoxyacetate (containing 70-100 μgm.) was applied to the upper surface of one of the primary leaves of each of a number of Red Kidney bean plants, some of which were kept in the light before and after application of the growth-regulator and some of which were kept in the dark for 24 hours before and after treatment. The leaves of some of the plants in the dark were dipped in sucrose solution several times shortly (1-3 hours) before the growth-regulator was applied. Sugar was supplied to still other plants by placing the cut end of one of the primary leaves of each plant in a vessel containing a 10% sugar solution. 2. The curvatures of the stems were measured 24 hours after application of the herbicide, and the treated leaves were removed at this time. The plants were then placed in the greenhouse for 10 days, at the end of which time the weight of the trifoliate leaves from each plant was determined. 3. No evidence was found that Na(2,4-D) was trans...