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Annals of Botany 40: 659-667, 1976
© 1976 Annals of Botany Company

RESEARCH-ARTICLE

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

B. T. WATSON

Department of Botany, University of Aberdeen, St. Machar Drive Aberdeen AB9 2UD

Received: 9 June 1975   

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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