TRANSPORT OF ROOT-FORMING HORMONE IN WOODY CUTTINGS

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Abstract
Expts. whereby hetero-auxin, either in lanolin mixture or water solution, was applied to the tips of lemon cuttings showed that hetero-auxin or some root-forming substance in the stem activated by hetero-auxin, would not move across a complete girdle but would move downward through a narrow strip of phloem left across the girdle provided the hetero-auxin was applied on the side of the cutting above the phloem bridge. Local chilling of the stem also prevented the downward transport of hetero-auxin. When water solutions of hetero-auxin were applied at the base of cuttings for 15 hrs., only strong ones were affected in inducing root formation. Cutting off the treated portion of the base of cuttings nearly eliminated the effect of the treatment and retreating with hetero-auxin after cutting off the treated base caused no more roots than when not re-treated. The hypothesis that a strong solution of hetero-auxin, when applied to the base of the cutting, causes the rapid downward movement of a substance which occurs in the leaves and stem and which is necessary for root formation is offered as an explanation of these facts.

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