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First published online May 8, 2008; 10.1104/pp.108.118562

Plant Physiology 147:1181-1191 (2008)
© 2008 American Society of Plant Biologists

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ENVIRONMENTAL STRESS AND ADAPTATION TO STRESS

The Effect of Iron on the Primary Root Elongation of Arabidopsis during Phosphate Deficiency1,[W],[OA]

James T. Ward, Brett Lahner, Elena Yakubova, David E. Salt and Kashchandra G. Raghothama*

Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, Indiana 47907–1165

Root architecture differences have been linked to the survival of plants on phosphate (P)-deficient soils, as well as to the improved yields of P-efficient crop cultivars. To understand how these differences arise, we have studied the root architectures of P-deficient Arabidopsis (Arabidopsis thaliana Columbia-0) plants. A striking aspect of the root architecture of these plants is that their primary root elongation is inhibited when grown on P-deficient medium. Here, we present evidence suggesting that this inhibition is a result of iron (Fe) toxicity. When the Fe concentration in P-deficient medium is reduced, we observe elongation of the primary root without an increase in P availability or a corresponding change in the expression of P deficiency-regulated genes. Recovery of the primary root elongation is associated with larger plant weights, improved ability to take up P from the medium, and increased tissue P content. This suggests that manipulating Fe availability to a plant could be a valuable strategy for improving a plant's ability to tolerate P deficiency.


1 This work was supported by grants from the U.S. Department of Agriculture.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Kashchandra G. Raghothama (kraghoth{at}purdue.edu).

[W] The online version of this article contains Web-only data.

[OA] Open Access articles can be viewed online without a subscription.

www.plantphysiol.org/cgi/doi/10.1104/pp.108.118562

* Corresponding author; e-mail kraghoth{at}purdue.edu.

Received March 1, 2008; accepted April 23, 2008; published May 8, 2008.




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