Abstract
IN the apple, as in many other perennial plants, all the absorbed nitrogen is usually reduced and combined into amino-acids in the youngest roots and is subsequently translocated in the form of such compounds. Xylem sap, which has been extracted from the terminal shoots of mature trees by a vacuum technique, contains nitrogen, largely as aspartic acid and asparagine, but also as arginine, glutamic acid and glutamine. There may be traces of a number of other amino-acids, depending on season and on added fertilizer1,2.
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HILL-COTTINGHAM, D., LLOYD-JONES, C. Relative Mobility of some Organic Nitrogenous Compounds in the Xylem of Apple Shoots. Nature 220, 389–390 (1968). https://doi.org/10.1038/220389b0
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DOI: https://doi.org/10.1038/220389b0
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