Abstract
MORRISON1 has suggested that the content of sap exuding from decapitated root stumps is unrepresentative of that of the transpiration stream. This suggestion arose from the finding that sap exuding from decapitated rooted cuttings of Salix vitellina which had been supplied with phosphorus-32 had levels of radioactivity up to about seven times those of the sap sucked by Bollard's method2 from the corresponding stems. Furthermore, while the stem sap contained only inorganic phosphorus-32, chromatograms of the sap exuded by the root stumps gave substantial peaks of radioactivity frequently found as running behind the inorganic phosphorus-32 (ref. 1).
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References
Morrison, T. M., Nature, 205, 1027 (1965).
Bollard, E. G., J. Exp. Bot., 4, 363 (1953).
Jones, O. P., and Lacey, H. J., J. Exp. Bot. (in the press).
Varley, J. A., Analyst, 91, 119 (1966).
Jackson, M. L., Soil Chemical Analysis, 151 (Prentice Hall, Inc., Englewood Cliffs, 1958).
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JONES, O., ROWE, R. Sampling the Transpiration Stream in Woody Plants. Nature 219, 403 (1968). https://doi.org/10.1038/219403a0
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DOI: https://doi.org/10.1038/219403a0
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