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JXB Advance Access published online on November 3, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erl189
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received July 26, 2006
Accepted September 6, 2006

RESEARCH PAPER

Ethylene could influence ferric reductase, iron transporter, and H+-ATPase gene expression by affecting FER (or FER-like) gene activity

Carlos Lucena 1, Brian M. Waters 2, F. Javier Romera 1 *, María José García 3, María Morales 1, Esteban Alcántara 1, and Rafael Pérez-Vicente 3

1 Department of Agronomy, Edificio Celestino Mutis (C-4), Campus de Rabanales, University of Córdoba, E-14014-Córdoba, Spain
2 Department of Pediatrics-Nutrition, Baylor College of Medicine, Houston, 1100 Bates Ave, Houston, TX 77030, USA
3 Department of Plant Sciences, Edificio Celestino Mutis (C-4), Campus de Rabanales, University of Córdoba, E-14014-Córdoba, Spain

* To whom correspondence should be addressed.
F. Javier Romera, E-mail: ag1roruf{at}uco.es


  Abstract

In previous works, it has been shown, by using ethylene inhibitors and precursors, that ethylene could participate in the regulation of the enhanced ferric reductase activity of Fe-deficient Strategy I plants. However, it was not known whether ethylene regulates the ferric reductase gene expression or other aspects related to this activity. This paper is a study of the effects of ethylene inhibitors and precursors on the expression of the genes encoding the ferric reductases and iron transporters of Arabidopsis thaliana (FRO2 and IRT1) and Lycopersicon esculentum (=Solanum lycopersicum) (FRO1 and IRT1) plants. The effects of ethylene inhibitors and precursors on the activity of the iron reductase and the iron transporter have been examined in parallel. Also studied were the effects of ethylene inhibitors and precursors on the expression of the H+-ATPase genes of cucumber (CsHA1 and CsHA2) and the transcription factor genes of tomato (LeFER) and Arabidopsis (AtFRU or AtFIT1, an LeFER homologue) that regulate ferric reductase, iron transporter, and H+-ATPse activity. The results obtained suggest that ethylene participates in the regulation of ferric reductase, the iron transporter, and H+-ATPase gene expression by affecting the FER (or FER-like) levels.

Keywords: Arabidopsis; cadmium; cucumber; ethylene; ferric reductase; H+-ATPase; iron; iron transporter; tomato.
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