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JXB Advance Access published online on May 2, 2008
Journal of Experimental Botany, doi:10.1093/jxb/ern098
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© 2008 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Rice–arsenate interactions in hydroponics: a three-gene model for tolerance

Gareth J. Norton1,*, Meher Nigar1, Paul N. Williams1, Tapash Dasgupta2, Andrew A. Meharg1 and Adam H. Price1

1Department of Plant and Soil Science, Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen AB24 3UU, UK
2Department of Genetics and Plant Breeding, University of Calcutta, 35 BC Road, Kolkata 700 019 West Bengal, India

* To whom correspondence should be addressed. E-mail: g.norton{at}abdn.ac.uk

In this study, the genetic mapping of the tolerance of root growth to 13.3 µM arsenate [As(V)] using the BalaxAzucena population is improved, and candidate genes for further study are identified. A remarkable three-gene model of tolerance is advanced, which appears to involve epistatic interaction between three major genes, two on chromosome 6 and one on chromosome 10. Any combination of two of these genes inherited from the tolerant parent leads to the plant having tolerance. Lists of potential positional candidate genes are presented. These are then refined using whole genome transcriptomics data and bioinformatics. Physiological evidence is also provided that genes related to phosphate transport are unlikely to be behind the genetic loci conferring tolerance. These results offer testable hypotheses for genes related to As(V) tolerance that might offer strategies for mitigating arsenic (As) accumulation in consumed rice.

Key words: Arsenate tolerance, candidate genes, epistatic interactions, Oryza sativa

Received 7 December 2007; Revised 5 February 2008 Accepted 7 March 2008


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