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Plant Physiol, March 2000, Vol. 122, pp. 945-956
Genotypical Differences in Aluminum Resistance of Maize Are
Expressed in the Distal Part of the Transition Zone. Is Reduced
Basipetal Auxin Flow Involved in Inhibition of Root Elongation by
Aluminum?1
Malte
Kollmeier,
Hubert H.
Felle, and
Walter J.
Horst*
Institute of Plant Nutrition, University of Hannover,
Herrenhäuser Strasse 2, D-30419 Hannover, Germany (M.K.,
W.J.H.); and Institute of General Botany and Plant Physiology,
University of Giessen, Senckenbergstrasse 17-21, D-35390 Giessen,
Germany (H.H.F.)
Short-term Al treatment (90 µM Al at pH 4.5 for 1 h) of the distal transition
zone (DTZ; 1-2 mm from the root tip), which does not contribute
significantly to root elongation, inhibited root elongation in the main
elongation zone (EZ; 2.5-5 mm from the root tip) to the same extent as
treatment of the entire maize (Zea mays) root apex.
Application of Al to the EZ had no effect on root elongation. Higher
genotypical resistance to Al applied to the entire root apex, and
specifically to the DTZ, was expressed by less inhibition of root
elongation, Al accumulation, and Al-induced callose formation,
primarily in the DTZ. A characteristic pH profile along the surface of
the root apex with a maximum of pH 5.3 in the DTZ was demonstrated. Al
application induced a substantial flattening of the pH profile moreso
in the Al-sensitive than in the Al-resistant cultivar. Application of
indole-3-acetic acid to the EZ but not to the meristematic zone
significantly alleviated the inhibition of root elongation induced by
the application of Al to the DTZ. Basipetal transport of exogenously
applied [3H]indole-3-acetic acid to the meristematic zone
was significantly inhibited by Al application to the DTZ in the
Al-sensitive maize cv Lixis. Our results provide evidence that the
primary mechanisms of genotypical differences in Al resistance are
located within the DTZ, and suggest a signaling pathway in the root
apex mediating the Al signal between the DTZ and the EZ through
basipetal auxin transport.
1
This work was supported by the Deutsche
Forschungsgemeinschaft within the Special Research Program 717 ("The
Apoplast of Higher Plants").
*
Corresponding author; e-mail
horst{at}mbox.pflern.uni-hannover.de; fax 49-511-762-3611.
© 2000 American Society of Plant Physiologists
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