Abstract
The ion-selective xylem probe is a new tool that allows for on-line recording of ion activities in the xylem sap when water is under tension. Ion-selective electrodes are combined with a xylem pressure probe additionally measuring the electrical potential in a vessel. Using a K+-selective probe, xylem K+ in maize roots was recorded simultaneously with the xylem pressure and the trans-root potential (the electrical potential in the root xylem with respect to the ambient medium) under conditions of varying light irradiation and K+ supply. Furthermore, a new pH-selective xylem probe is presented. The impact of the new xylem probes for studies on plant nutrition is discussed.
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Wegner, L., Schneider, H., Zimmermann, U. (2007). On-Line Measurements of Ion Relations in the Xylem Sap of Intact Plants. In: Sattelmacher, B., Horst, W.J. (eds) The Apoplast of Higher Plants: Compartment of Storage, Transport and Reactions. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5843-1_16
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DOI: https://doi.org/10.1007/978-1-4020-5843-1_16
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