Graphical evaluation and partitioning of turgor responses to drought in leaves of durum wheat |
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Authors: | S. B. Kikuta H. Richter |
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Affiliation: | (1) Botanisches Institut der Universität für Bodenkultur, Gregor Mendel-Strasse 33, A-1180 Wien, Austria |
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Abstract: | The relationship between relative water content (R) and turgor potential (p) may be derived from pressure-volume (PV) curves and analyzed in various ways. Fifty PV curves were measured with the pressure chamber on leaves of durum wheat (Triticum durum L.). The plots of p versus R were highly variable and could not be adequately described by a single mathematical function. The area below the curve was therefore determined by means of an area meter. This procedure gave the integral of turgor from full saturation to the turgor-loss point. Responses to drought treatment could thus be quantified and partitioned into effects of osmotic adjustment and elastic adjustment. These two adjustment responses, which are probably of different metabolic origin, together improve turgor maintenance in durum wheat considerably.Abbreviations and symbols PV pressure-volume - R relative water content - Ti turgor integral between full saturation and turgor-loss point - p turgor (pressure) potential |
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Keywords: | Elastic adjustment Osmotic adjustment Pressure-volume relations Triticum (drought responses) Turgor adjustment Water stress |
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