Relative Mobility of some Organic Nitrogenous Compounds in the Xylem of Apple Shoots

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 t...

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Bibliographic Details
Published in:Nature (London) 1968-01, Vol.220 (5165), p.389-390
Main Authors: HILL-COTTINGHAM, D. G., LLOYD-JONES, C. P.
Format: Article
Language:English
Subjects:
Humanities and Social Sciences
letter
multidisciplinary
Science
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Summary: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 fertilizer 1,2 .
ISSN:0028-0836
1476-4687
DOI:10.1038/220389b0