Bicarbonate-induced alkalinization of the xylem sap in intact maize seedlings as measured in situ with a novel xylem pH probe

Plant Physiology
Lars H Wegner, Ulrich Zimmermann

Abstract

In higher plants the pH of the xylem sap plays an important role in drought signaling, growth regulation, and plant nutrition. However, the interpretation of the data is very controversial. The main reason for this is that the xylem pH in intact plants was not directly accessible hitherto. We present here a novel, minimally-invasive probe based on the xylem pressure-potential probe (used for measuring directly xylem pressure and the electrical potential between root xylem sap and medium). Single-tipped, double-barreled capillaries were used, one barrel served as H(+)-selective electrode, whereas pressure and electrical potential were recorded by the other one. Upon insertion of the probe into the root xylem of maize (Zea mays) seedlings, pH values ranging between about 4.2 and 4.9 were monitored when the roots were immersed in standard nutrient solution. The pH did not respond to changes in light irradiation (up to 300 micromol m(-2) s(-1)), but increased upon exposure of the root to 5 or 20 mm bicarbonate in the bath solution. Changes in pH could also be recorded in transpiring plants when the root was cut below the insertion point of the probe and placed in media with different pH. The data support the hypothesis of Mengel ([...Continue Reading

References

Nov 4, 1998·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·E A MacRobbie
Feb 13, 2001·Science·M A ZwienieckiN M Michele Holbrook
Sep 17, 1996·Proceedings of the National Academy of Sciences of the United States of America·D J WalkerA J Miller
Nov 2, 2002·The Plant Journal : for Cell and Molecular Biology·Lars H Wegner, Ulrich Zimmermann
Nov 26, 2002·Nature·Wolf B Frommer, Nicolaus von Wirén
Nov 26, 2002·Nature·Junpei TakanoToru Fujiwara
Feb 1, 2001·The New Phytologist·Burkhard Sattelmacher

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Citations

Jul 13, 2006·Planta·Rainer Hedrich, Irene Marten
Jan 5, 2014·Planta·Werner E G MüllerXiaohong Wang
Mar 21, 2007·Trends in Plant Science·Wim van Ieperen
Aug 30, 2005·Bioelectrochemistry·Satoshi SasakiNobutaka Hanagata
May 13, 2018·International Journal of Molecular Sciences·Charlotte PoschenriederJuan Barceló

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