|
Plant Physiol, April 2000, Vol. 122, pp. 1109-1118
Role of Hormones in the Induction of Iron Deficiency Responses in
Arabidopsis Roots1
Wolfgang
Schmidt,*
Julia
Tittel, and
Adam
Schikora
Carl von Ossietzky Universität Oldenburg, Fachbereich
Biologie, 26111 Oldenburg, Postfach 2503, Germany
In "strategy I" plants, several
alterations in root physiology and morphology are induced by Fe
deficiency, although the mechanisms by which low Fe levels are
translated into reactions aimed at alleviating Fe shortage are largely
unknown. To prove whether changes in hormone concentration or
sensitivity are involved in the adaptation to suboptimal Fe
availability, we tested 45 mutants of Arabidopsis defective in hormone
metabolism and/or root hair formation for their ability to increase
Fe(III) chelate reductase activity and to initiate the formation and
enlargement of root hairs. Activity staining for ferric chelate
reductase revealed that all mutants were responsive to Fe deficiency,
suggesting that hormones are not necessary for the induction. Treatment
of wild-type plants with the ethylene precursor
1-aminocyclopropane-1-carboxylic acid caused the development of root
hairs in locations normally occupied by non-hair cells, but did not
stimulate ferric reductase activity. Ectopic root hairs were also
formed in  Fe roots, suggesting a role for ethylene in the
morphological responses to Fe deficiency. Ultrastructural analysis of
rhizodermal cells indicated that neither Fe deficiency nor
1-aminocyclopropane-1-carboxylic acid treatment caused
transfer-cell-like alterations in Arabidopsis roots. Our data indicate
that the morphological and physiological components of the Fe stress
syndrome are regulated separately.
1
This work was supported by the Deutsche Forschungsgemeinschaft.
*
Corresponding author; e-mail wschmidt{at}uni-oldenburg.de; fax
49-441-798-3318.
© 2000 American Society of Plant Physiologists
This article has been cited by other articles:
|
|
|
|
 
H. Maeda, T. L. Sage, G. Isaac, R. Welti, and D. DellaPenna
Tocopherols Modulate Extraplastidic Polyunsaturated Fatty Acid Metabolism in Arabidopsis at Low Temperature
PLANT CELL,
February 1, 2008;
20(2):
452 - 470.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
C. Lucena, B. M. Waters, F. J. Romera, M. J. Garcia, M. Morales, E. Alcantara, and R. Perez-Vicente
Ethylene could influence ferric reductase, iron transporter, and H+-ATPase gene expression by affecting FER (or FER-like) gene activity
J. Exp. Bot.,
December 1, 2006;
57(15):
4145 - 4154.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
M. Muller and W. Schmidt
Environmentally Induced Plasticity of Root Hair Development in Arabidopsis
Plant Physiology,
January 1, 2004;
134(1):
409 - 419.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
P. V. Minorsky
Plant Physiology,
June 1, 2002;
129(2):
438 - 439.
[Full Text]
[PDF]
|
|
|
|
|
|
|
J. Lopez-Bucio, E. Hernandez-Abreu, L. Sanchez-Calderon, M. F. Nieto-Jacobo, J. Simpson, and L. Herrera-Estrella
Phosphate Availability Alters Architecture and Causes Changes in Hormone Sensitivity in the Arabidopsis Root System
Plant Physiology,
May 1, 2002;
129(1):
244 - 256.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
B. G. Forde
The role of long-distance signalling in plant responses to nitrate and other nutrients
J. Exp. Bot.,
January 1, 2002;
53(366):
39 - 43.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
O. Thimm, B. Essigmann, S. Kloska, T. Altmann, and T. J. Buckhout
Response of Arabidopsis to Iron Deficiency Stress as Revealed by Microarray Analysis
Plant Physiology,
November 1, 2001;
127(3):
1030 - 1043.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
A. Schikora and W. Schmidt
Iron Stress-Induced Changes in Root Epidermal Cell Fate Are Regulated Independently from Physiological Responses to Low Iron Availability
Plant Physiology,
April 1, 2001;
125(4):
1679 - 1687.
[Abstract]
[Full Text]
|
|
|
|
|
|
|
W. Schmidt and A. Schikora
Different Pathways Are Involved in Phosphate and Iron Stress-Induced Alterations of Root Epidermal Cell Development
Plant Physiology,
April 1, 2001;
125(4):
2078 - 2084.
[Abstract]
[Full Text]
|
|
|
|
|
