By Kenneth V. Thimann
The motion of Hormones in vegetation and invertebrates
summary: The motion of Hormones in crops and invertebrates
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Additional info for The Action of Hormones in Plants and Invertebrates
Conversely, when high concentrations are applied to the base, roots are formed there only. Since many active substances are only poorly transported also, the logical procedure is to apply to the base. /l. /l. for resistant woody plants, applied for 24 hours to the base, are used in practice. A few seconds' dip in highly concentrated (several grams per liter) alcoholic solutions is a practical alternative. The cuttings may instead be dipped in talc containing the auxin, enough adhering to the moist surface for effective action.
The response of roots to auxin is thus given by an optimum curve with its peak at excessively low auxin concentrations, as shown in Fig. 7. , by branching (151,312,372). The same effect results from decapitation of the root tip. However, such branching is not simply due to the inhibition of the tip growth, but is directly caused by auxin, because, as shown by Thimann (311), when auxin is applied to the base of the stem of Pisum, it slightly accelerates the growth rate of the main root, but still promotes the formation of laterals.
Thus it is the diffusible auxin which is redistributed by gravity. The mechanism by which auxin is transported laterally under the influence of gravity is unknown. Attempts to correlate it with "geoelectric potentials" have been without success, as discussed in Section IV for normal transport. It would seem that gravity can only be perceived by something falling; the older literature ascribed much importance to small starch grains, the "statoliths" of Haberlandt, but as yet no relation between the movement of these and the movement of auxin has been established.