Matric Water Potential of Leaf Tissue—Measurement and Significance
- 1 June 1975
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Experimental Botany
- Vol. 26 (3) , 465-468
- https://doi.org/10.1093/jxb/26.3.465
Abstract
A thermocouple psychrometer method, previously described for use in determining tissue and sap water potentials, has been adapted for determining matric potentials. Matric values ranging from approximately zero to −10 × 105 Pa were observed with wilting wheat leaves. Mean values of total tissue water potential and of its solute (osmotic), matric, and cell wall pressure components were −16.6, −18.3, −30 and +4.7 Pa × 105, respectively. Matric potentials are often ignored in investigations of plant water relations. This practice is shown to result in underestimation of wall pressures (in this case by a mean of 64 per cent) and sometimes in spuriously negative values.Keywords
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