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SELECTIVE AND STEREO‐SPECIFIC ABSORPTION OF VARIOUS AMINO ACIDS DURING XYLEM TRANSLOCATION IN TOMATO STEMS
Author(s) -
Die J.,
Vonk C. R.
Publication year - 1967
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1967.tb00104.x
Subject(s) - xylem , amino acid , glycine , alanine , proline , chemistry , glutamic acid , absorption (acoustics) , biochemistry , biology , botany , physics , acoustics
SUMMARY Solutions of 14 C‐labelled amino acids were allowed to percolate through the xylem vessels of tomato stem parts. The amounts absorbed by the stem tissues were determined by analyses of the collected fluid. The protein amino‐acids glycine and L‐α‐alanine were strongly retained by the stem tissues and partly metabolized. Hardly or no absorption, however, was found for either the protein amino‐acids L‐proline and L‐glutamic acid, or for the “unnatural” amino‐acids D‐α‐alanine, D‐glutamic acid and α‐aminoisobutyric acid. It is concluded that during xylem translocation of amino‐acids a selective uptake may occur by binding sites from which at least some have a stereo‐specific affinity for these compounds.