Summary
Considerable two-way interchange of label derived from 14C-GA3 and 14C-kinetin has been shown to occur between the xylem and extra-cambial tissue of Salix viminalis L. Radial translocation of both growth substances from the transpiration stream to the sieve-tube sap has been demonstrated by the use of an aphid technique. This is the first record of the bark-xylem interchange of these two growth hormones.
A high percentage of 14C-label is present in compounds other than GA3 and kinetin 8 hours after application.
Mechanisms of lateral transfer are discussed together with their possible physiological significance.
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This work was carried out during the tenure of an N.E.R.C. studentship by M.R.B.
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Bowen, M.R., Wareing, P.F. The interchange of 14C-kinetin and 14C-gibberellic acid between the bark and xylem of willow. Planta 89, 108–125 (1969). https://doi.org/10.1007/BF00386979
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DOI: https://doi.org/10.1007/BF00386979