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Six dichloro-, 3 trichloro-, 2 triiodo-, and 3 heterosubstituted benzoic acids (amiben, dinoben, dicamba), and N-1-naphthylphthalamic acid have been tested for effects on growth and on polar auxin transport. Growth activity with and without kinetin was measured by effects on fresh and dry weights of 30-day cultures of fresh tobacco pith. Transport(More)
Prev-ious attempts to (letermiinle the capacity of various tissues to destrov auxini have consiste(l of measuring either residual inidoleacetic acid (IAA) colorimetrically (2) following, or O., uptake manometrically (4) during, incubation. Galston anid Dalberg (2). using a colorimetric method, first reported a positive correlation with age in respect to the(More)
It has been observed in this laboratory (15) that the normally polar distribution of callus growth on tobacco stem explants becomes non-po'ar in the presence of low levels of 2,3,5-triiodobenzoic acid (TIBA), while the amount of callus growth is not diminished. It was thought that this phenomenon might reflect a specific inhibition by TIBA of the polar(More)