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Potassium Absorption by Rice at Different Levels of Organization
Author(s) -
ERDEI LÁSZLÓ,
ZSOLDOS FERENC
Publication year - 1977
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.1399-3054.1977.tb05538.x
Subject(s) - calcium , potassium , oryza sativa , callus , chemistry , botany , sodium , absorption (acoustics) , biophysics , biochemistry , food science , analytical chemistry (journal) , chromatography , biology , materials science , organic chemistry , composite material , gene
A study was made of the effects of temperature and calcium on the properties of K + transport in rice roots ( Oryza sativa L. cv. Dunghan Shali), in cell suspension culture of rice and in callus cultures. The rates of influx and efflux of K + were measured by using 86 Rb as tracer, and the net change in K + content was determined by atomic absorption spectrophotometry. In roots of low salt status the K + transport mechanism exhibits a positive temperature dependence and calcium exerts a stimulation. In cell and callus cultures a transport mechanism of this kind is lacking, and the K + fluxes are inhibited by calcium and independent of temperature. Chilling‐induced K + leakage is similar for both types of tissue, and can be characterized by a negative temperature‐coefficient and the inhibitory effect of calcium.