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Plant Physiol, November 1999, Vol. 121, pp. 905-912
The Correlation of Profiles of Surface pH and Elongation Growth
in Maize Roots1
Winfried S.
Peters2* and
Hubert H.
Felle
Institut für Allgemeine Botanik und Pflanzenphysiologie,
Justus-von-Liebig-Universität, Senckenbergstrasse 17-21,
D-35390 Giessen, Germany
High-resolution
profiles of surface pH and growth along vertically growing maize
(Zea mays) primary root tips were determined simultaneously by pH-sensitive microelectrodes and marking experiments. Methodological tests were carried out that proved the reliability of
our kinematic growth analysis, while questioning the validity of an
alternative technique employed previously. A distal acidic zone around
the meristematic region and a proximal one around the elongation zone
proper were detected. This pattern as such persisted irrespective of
the bulk pH value. The proximal acidic region coincided with maximum
relative elemental growth rates (REGR), and both characters reacted in
a correlated manner to auxin and cyanide. The distal acidic band was
unrelated to growth, but was abolished by cyanide treatment. We
conclude that: (a) the pattern of surface pH as such is a regulated
feature of growing root tips; (b) the correlation of extracellular pH
and growth rate suggests a functional relationship only along proximal
portions of the growing root tip; and (c) the distal acidic band is not caused by pH buffering by root cap mucilage, as suggested previously, but rather is controlled by cellular activity.
1
This work was supported by the Deutsche
Forschungsgemeinschaft (project no. 717).
2
Present address: AK Kinematische Zellforschung,
Biozentrum der J.W. Goethe-Universität, Marie-Curie-Strasse 9, D-60439 Frankfurt, Germany.
*
Corresponding author; e-mail w.s.peters{at}zoology.uni-frankfurt.de;
fax 49-0-69-79829607.
© 1999 American Society of Plant Physiologists
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