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Effects of Ca 2+ and Temperature on K + Content Distribution along Roots of Wheat, Rice and Cucumber
Author(s) -
ZSOLDOS FERENC,
KARVALY BÉLA
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.tb01590.x
Subject(s) - cucumis , oryza sativa , chemistry , botany , horticulture , biology , biochemistry , gene
The effects of Ca 2+ and temperature on the K + contents of root segments of wheat ( Triticum aestivum L. cv. Aurora), rice ( Oryza sativa L. cv. Dunghan Shali) and cucumber ( Cucumis sativus L. cv. Csemege Fürtös) were investigated with special regard to the low‐temperature anomaly of the K + uptake of thermophilic plants. The anomaly occurred in those root segments where the K + contents turned out to be highest. The K + contents of the apical root sections of thermophilic species responded in general to Ca 2+ in more pronounced ways than those of wheat, at both 0 and 25°C. The concerted actions of a purely physical process with negative temperature coefficient and of the special thermotropic properties of the membranes are suggested to be responsible for the low‐temperature anomaly. A strict discrimination between the Viets‐effect on the content (classical Viets‐effect) and on the uptake is proposed. The classical Viets‐effect seems to be related to alterations in both active transport and exchange processes.