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Negative Turgor Pressures in Plant Cells
Author(s) -
Oertli J. J.
Publication year - 1986
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19861490108
Subject(s) - turgor pressure , osmotic pressure , bar (unit) , stress (linguistics) , cell wall , biophysics , mechanics , materials science , chemistry , biology , geology , biochemistry , physics , linguistics , philosophy , oceanography
Non‐osmotic moisture stress can be simulated by applying to a plant tissue a solute that cannot penetrate the cell wall. The external reduction in water potential caused by such a non‐penetrating solute is compensated for by a reduction in pressure within the cell. The pressure is ambient throughout a cell that has been plasmolysed by a penetrating osmoticum. A supplementary non‐penetrating osmoticum must also be compensated for by lowering the internal pressure, i.e. a negative turgor pressure must develop. Onion skin cells can withstand a resulting mechanical stress of up to about 10KPa (1/10 Bar) before collapsing.
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