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THE EFFECT OF SALT AND OSMOTIC STRESS ON THE RETENTION OF POTASSIUM BY EXCISED BARLEY AND BEAN ROOTS
Author(s) -
NASSERY H.
Publication year - 1975
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1975.tb01371.x
Subject(s) - potassium , phaseolus , mannitol , chemistry , hordeum vulgare , membrane permeability , osmotic shock , salt (chemistry) , sodium , efflux , calcium , horticulture , botany , membrane , poaceae , biology , biochemistry , organic chemistry , gene
SUMMARY The effect of different concentrations of NaCl, mannitol and CaCl 2 on the retention of potassium ion by preloaded roots of barley, Hordeum vulgare , and bean, Phaseolus vulgaris , indicated that 50 mM NaCl had no effect on potassium loss, but 50 mM NaCl or more increased the rate of efflux. Barley roots appeared 10 be more sensitive to salt stress than bean roots since 100 mM NaCl caused 78% potassium loss over 6.5 h by barley as compared with 40% loss by bean roots. Mannitol up to 200 mM had no effect on the retention of potassium by barley roots but slightly increased the potassium loss from bean roots (26%). The results suggested that salt stress is more effective than osmotic stress in disrupting the membrane permeability and calcium ions can prevent the increased permeability caused by osmotic or ionic stress.