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JXB Advance Access originally published online on April 24, 2009
Journal of Experimental Botany 2009 60(9):2553-2563; doi:10.1093/jxb/erp099
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© 2009 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

Differentially expressed membrane transporters in rice roots may contribute to cultivar dependent salt tolerance

Prasad Senadheera1, R. K. Singh3 and Frans J. M. Maathuis2,*

1Department of Plant Science, University of Colombo, Colombo, Sri Lanka
2Biology Department, Area 9, University of York, York YO10 5DD, UK
3International Rice Research Institute, Los Baños, Pillippines

* To whom correspondence should be addressed: E-mail; fjm3{at}york.ac.uk

Salinity tolerance in rice, like in other glycophytes, is a function of cellular ion homeostasis. The large divergence in ion homeostasis between the salt-tolerant FL478 and salt-sensitive IR29 rice varieties can be exploited to understand mechanisms of salinity tolerance. Physiological studies indicate that FL478 shows a lower Na+ influx, a reduced Na+ translocation to the shoot, and maintains a lower Na+:K+ ratio. To understand the basis of these differences, a comparative investigation of transcript regulation in roots of the two cultivars was undertaken. This analysis revealed that genes encoding aquaporins, a silicon transporter, and N transporters are induced in both cultivars. However, transcripts for cation transport proteins including OsCHX11, OsCNGC1, OsCAX, and OsTPC1 showed differential regulation between the cultivars. The encoded proteins are likely to participate in reducing Na+ influx, lowering the tissue Na+:K+ ratio and limiting the apoplastic bypass flow in roots of FL478 and are therefore important new targets to improve salt tolerance in rice.

Key words: Monovalent ion uptake, rice, root membrane transporters, salinity tolerance, silicon accumulation-transciptomics

Received 11 December 2008; Revised 3 March 2009 Accepted 6 March 2009


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