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Water stress injuries and tolerance as related to potassium efflux from winter rape hypocotyls
Author(s) -
Shcherbakova Anna,
Kacperska Alina
Publication year - 1983
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.1399-3054.1983.tb00914.x
Subject(s) - efflux , potassium , desiccation , chemistry , hypocotyl , biophysics , biology , botany , biochemistry , organic chemistry
Desiccation‐ or immersion‐induced injuries in isolated winter rape ( Brassica napus L. var. oleifera cv. Górczański) hypocotyls were highly correlated with potassium efflux and were reversible if the tissue damage was not severe (i.e. when less than 20% of electrolytes leaked from stressed tissue). The time‐course of leakage of potassium and other electrolytes showed that increased membrane permeability might result from stress‐induced disturbances in membrane integrity. Increased stress tolerance in hypocotyls predehydrated to a water saturation deficit of about 60% seemed to be due to stabilization of membrane structure rather than to promotion of a repair mechanism. The hardening effect of predehydration was more effective for potassium efflux than for efflux of other electrolytes.