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Inhibition of the amino‐acid co‐transport carrier of Lemna gibba by incorporation of p ‐fluorophenylalanine
Author(s) -
Jung K.D.,
Lüttge U.
Publication year - 1982
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1982.tb02293.x
Subject(s) - lemna gibba , fusicoccin , lemna , alanine , depolarization , amino acid , hyperpolarization (physics) , chemistry , biochemistry , biology , stereochemistry , biophysics , atpase , botany , nuclear magnetic resonance spectroscopy , enzyme , ecology , aquatic plant , macrophyte
In Lemna gibba L. a 2 h pretreatment with the amino‐acid analogue p ‐fluorophenylalanine p ‐FPA inhibited subsequent uptake of L‐alanine and reduced the transient depolarization of the plasmalemma caused by L‐alanine. Uptake of 3–0‐methylglucose was less affected. There was no effect of p ‐fluorophenylalanine on the resting potential or on the fusicoccin‐ or light‐dependent hyperpolarization of the cells. Furthermore, fusicoccin‐stimulation of uptake of L‐alanine and 3–0‐methylglucose was also unaffected. The results suggest that p ‐FPA pretreatment selectively acts on the H + ‐amino‐acid co‐transport carrier, that the H + ‐hexose co‐transport carrier is much less affected, and that the proton pump appears to be unaffected by p‐FPA.