Control of light-induced bean leaf expansion: Role of osmotic potential,wall yield stress,and hydraulic conductivity |
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Authors: | Elizabeth Van Volkenburgh Robert E. Cleland |
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Affiliation: | (1) Department of Botany, University of Washington, 98195 Seattle, WA, USA;(2) Present address: Department of Biological Sciences, University of Lancaster, LA1 4YQ Lancaster, U.K. |
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Abstract: | The role of three-turgor-related cellular parameters, the osmotic potential (s), the wall yield stress (Y) and the apparent hydraulic conductivity (L'p), in the initiation of ligh-induced expansion of bean (Phaseolus vulgaris L.) leaves has been determined. Although light causes an increase in the total solute content of leaf cells, the water uptake accompanying growth results in a slight increase in s. Y is about 4 bar; and is unaffected by light. L'p, as calculated from growth rates and isopiestic measurements of leaf water potential, is only slightly greater in rapidly-growing leaves. The turgor pressure of growing cells is lower than that of the controls by about 35%. We conclude that light does not induce cell enlargement in the leaf by altering any of the above parameters, but does so primarily by increasing wall extensibility.Abbreviations and symbols RL red light - WL white light - L'p apparent hydraulic conductivity - OC osmotic concentration - Y wall yield stress - s osmotic potential |
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Keywords: | Cell wall (extensibility) Hydraulic conductivity Leaf growth Light and leaf growth Osmotic potential Phaseolus Yield stress |
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