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Plant Physiol, April 2001, Vol. 125, pp. 1679-1687
Iron Stress-Induced Changes in Root Epidermal Cell Fate Are
Regulated Independently from Physiological Responses to Low Iron
Availability1
Adam
Schikora and
Wolfgang
Schmidt*
Carl von Ossietzky Universität Oldenburg, Fachbereich
Biologie, Geo und Umweltwissenschaften, D-26111 Oldenburg,
Postfach 2503, Germany
Iron-overaccumulating mutants were investigated with respect to
changes in epidermal cell patterning and root reductase activity in
response to iron starvation. In all mutants under investigation, ferric
chelate reductase activity was up-regulated both in the presence and
absence of iron in the growth medium. The induction of transfer cells
in the rhizodermis appeared to be iron regulated in the pea
(Pisum sativum L. cv Dippes Gelbe Viktoria and cv
Sparkle) mutants bronze and degenerated
leaflets, but not in roots of the tomato (Lycopersicon
esculentum Mill. cv Bonner Beste) mutant chloronerva, suggesting that in
chloronerva iron cannot be recognized by putative sensor
proteins. Experiments with split-root plants supports the hypothesis
that Fe(III) chelate reductase is regulated by a shoot-borne signal
molecule, communicating the iron status of the shoot to the roots. In
contrast, the formation of transfer cells was dependent on the local
concentration of iron, implying that this shoot signal does not affect
their formation. Different repression curves of the two responses imply
that the induction of transfer cells occurs after the enhancement of
electron transfer across the plasma membrane rather than being causally
linked. Similar to transfer cells, the formation of extra root hairs in the Arabidopsis mutant man1 was regulated by the iron
concentration of the growth medium and was unaffected by interorgan signaling.
1
This work was supported by the Deutsche Forschungsgemeinschaft.
*
Corresponding author; e-mail wschmidt{at}uni-oldenburg.de; fax
49-441-798-3318.
© 2001 American Society of Plant Physiologists
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