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Allosteric and Non‐Allosteric Regulation of Rubidium Influx in Barley Roots
Author(s) -
PETTERSSON SUNE,
JENSÉN PAUL
Publication year - 1978
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.1399-3054.1978.tb01623.x
Subject(s) - allosteric regulation , hordeum vulgare , rubidium , chemistry , biophysics , biochemistry , botany , biology , potassium , enzyme , poaceae , organic chemistry
Uptake of Rb + was investigated in 6–8‐day‐old intact barley plants ( Hordeum vulgare cv. Kristina), which had been cultivated or pretreated in nutrient solutions with various K + concentrations. The relationship between Rb + influx and the K + concentration of roots appeared to be sigmoidal for plants grown in solutions containing K + , indicating regulation of Rb + uptake by allosteric inhibition of the uptake mechanism. Pretreatment of the roots in K + ‐free solutions changed the pattern of uptake and caused the Rb + influx to become linearly related to the chemical Rb + potential of the uptake solution. Pretreatment in K + ‐free solutions probably abolishes the allosteric inhibition of a carrier system.