The Effect of Cooling on Translocation inSalix viminalis

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Abstract
Radioactive phosphate was applied externally to a small area of the bark of the main stem below the point of insertion of a leafy branch. When photosynthesis and hence translocation was proceeding, phosphate was carried down the stem and was monitored externally by two Geiger counters spaced 10 cm apart further down the stem. Sudden cooling to 0 °C of the leaves, or the stem between the leaves and the point of application of the isotope, caused a rapid and seemingly simultaneous response by the two Geiger counters. It is concluded that cooling at one point causes an instantaneous reduction of velocity along the whole pathway. If cooling is continued for several hours the rate of translocation of phosphate recovers. The evidence suggests that this recovery is due to a compensatory increase in concentration of radioactive phosphate in the translocation stream rather than a recovery of velocity.

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