Rapid Propagation of Changes in Velocity of Translocation along the Phloem Pathway of Helianthus annuus L.

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Abstract
Localized interruptions of the phloem pathway of sunflower plants, by heat ringing, caused prompt falls in rate of translocation at sites up to 50 cm distant from the ring. The velocity with which this change in rate was propagated down the phloem was an order of magnitude greater than the velocity of translocation itself. It is argued that the findings give support to the pressure-flow hypothesis but do not fit so well with certain other ideas concerning possible systems by which translocation could be brought about.

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