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Defoliation affects xylem sap amino acids
Following defoliation of Lolium perenne, Thornton and Macduff (pp. 715-722) report that the concentration of amino acids in the xylem fluid, sampled above the leaf meristem, falls rapidly, concomitant with an increased Asn : Gln ratio. These responses are independent of the phasing of the defoliation to the light period. In intact plants, 15N-labelled nitrate supplied to the roots is quickly incorporated into xylem Gln suggesting rapid Gln turnover.
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