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Salinity stress and cytoplasmic factors. A comparison of cell permeability and lipid partiality in salt sensitive and salt resistant cultivars and lines of Triticum aestivum and Hordeum vulgare
Author(s) -
Magdy M.,
Mansour F.,
LeeStadelmann OK Young,
Stadelmann Eduard J.
Publication year - 1993
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.1399-3054.1993.tb01771.x
Subject(s) - hordeum vulgare , hoagland solution , salinity , cultivar , osmotic shock , membrane permeability , peg ratio , osmotic pressure , coleoptile , membrane , chemistry , botany , biology , biochemistry , poaceae , ecology , finance , gene , economics
Salinity effects on the cell membranes of four lines of wheat ( Triticum aestivum L.). and two cultivars of barley ( Hordeum vulgare L.), differing in salt resistance were investigated. Plants were grown for 10 days in 1/4‐strength Hoagland solution and then for 5 more days in 1/4‐strength Hoagland with and without NaCl (100 m M ) or (for Hordeum only) polyethylene glycol (PEG). Permeability to three non‐electrolytes (urea, methylurea and ethylurea) of subepidermal cells of leaf sheaths ( Triticum ) and coleoptiles ( Hordeum ) was determined and membrane partiality calculated, a parameter which numerically indicates the degree of lipophilicity of a membrane. Non‐electrolyte permeability significantly increased and membrane partiality decreased in the salt sensitive cultivars or lines under salt stress. Neither parameter changed significantly in the salt resistant lines and cultivar in a saline environment. Osmotic stress in Hordeum by PEG 10000 had no significant effect on permeability and thus membrane partiality neither in sensitive nor in resistant cultivars. The osmotic component of salinity stress did not seem to be a major factor causing injury, rather ion toxicity may be a cause of cell damage. The results indicate differences in the membrane between salt sensitive and salt resistant genotypes. Salt resistance seems to be controlled by genetic factors independent of external salinity levels.