Abstract
THE predominance of organic nitrogenous compounds in the tracheal sap of apple trees1 implies that incoming inorganic nitrogen is largely converted into organic form in the root system. The transpiration stream then carries to the shoot a mixture of amino-acids and amides among which aspartic acid, asparagine and glutamine are quantitatively the most important.
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References
Bollard, E. G., Nature, 171, 571 (1953).
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Bollard, E. G. (in the press).
Miettinen, J. K., and Virtanen, A. I., Physiol. Plantarum, 5, 540 (1952).
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BOLLARD, E. Nitrogenous Compounds in Plant Xylem Sap. Nature 178, 1189–1190 (1956). https://doi.org/10.1038/1781189a0
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DOI: https://doi.org/10.1038/1781189a0
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