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• W2015130479 abstract "The radial electrical potential difference between the root xylem and the bathing solution, i.e. the so‐called trans‐root potential, was measured in intact maize and wheat plants using a xylem pressure probe into which an Ag/AgCl electrode was incorporated. Besides other advantages (e.g. detection and removal of tip clogging; determination of the radial root resistance), the novel probe allowed placement of the electrode precisely in a single xylem vessel as indicated by the reading of sub‐atmospheric or negative pressure values upon penetration. The trans‐root potentials were of the order of 0 to – 70 mV and + 40 to – 20 mV for 2‐ to 3‐week‐old maize and wheat plants, respectively. Osmotic experiments performed on maize demonstrated that addition of 100 m M mannitol to the solution resulted in a decrease of xylem pressure associated with a slow, but continuous depolarization. The depolarization was reversible upon removal of the mannitol. For wheat plants it could be shown that the oscillations of the xylem pressure described recently by Schneider et al. (1997, Plant, Cell and Environment 20, 221–229) were accompanied by (rectangular, saw‐tooth and/or U‐shaped) oscillations in the trans‐root potential (but not by corresponding changes of the membrane potential of the cortical cells measured simultaneously with conventional microelectrodes). Increase of the light intensity (up to 550 μ mol m –2 s –1 ) resulted in a drop of the xylem pressure in wheat, whereas the trans‐root potential showed a biphasic response: first hyperpolarization (by about 10 mV) was observed, followed by depolarization (by up to about + 40 mV). Similar light‐induced biphasic (but often less pronounced) changes in the trans‐root potential were also recorded for maize plants. Most interestingly, the response of the trans‐root potential was always faster (by about 1–3 min) than the response of the xylem pressure upon illumination, suggesting that changes in the transpiration rate are reflected very quickly in the electrical properties of the root tissue. The impact of this and other findings on long‐distance transport of solutes and water as well as on long‐distance signalling is discussed." @default.
• W2015130479 created "2016-06-24" @default.
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• W2015130479 date "1998-09-01" @default.
• W2015130479 modified "2023-10-16" @default.
• W2015130479 title "Simultaneous recording of xylem pressure and trans‐root potential in roots of intact glycophytes using a novel xylem pressure probe technique" @default.
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• W2015130479 doi "https://doi.org/10.1046/j.1365-3040.1998.00335.x" @default.
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