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Plant and Cell Physiology Advance Access originally published online on November 14, 2007
Plant and Cell Physiology 2007 48(12):1673-1678; doi:10.1093/pcp/pcm159
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Rapid Paper

Identification of Boron Transporter Genes Likely to be Responsible for Tolerance to Boron Toxicity in Wheat and Barley

Rob Reid*

School of Earth and Environmental Sciences, University of Adelaide, Adelaide 5005, Australia

*Corresponding author: E-mail, robert.reid{at}adelaide.edu.au; Fax, +61–8-83036222.


  Abstract

Tolerance to boron (B) toxicity in cereals is known to be associated with reduced tissue accumulation of B. Genes from roots of B-tolerant cultivars of wheat and barley with high similarities to previously reported B efflux transporters from Arabidopsis and rice were cloned. Expression of these genes was strongly correlated with the ability of tolerant genotypes to lower the concentration of B in roots. The gene from barley located to chromosome 4. Backcross lines containing a B tolerance locus on chromosome 4 showed tolerance in proportion to the level of expression of the transporter gene, whereas those lacking the locus were sensitive to B and had very low levels of gene expression. The results are consistent with a widespread mechanism of tolerance to high B based on efflux of B from root cells.

Keywords: The nucleotide sequences reported in this paper have been submitted to GenBank under accession numbers EU220225 and EU223365.

Abbreviations: EST, expressed sequence tag; ICP-OES, inductively coupled plasma–optical emission spectroscopy

(Received October 23, 2007; Accepted November 11, 2007)
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R. Reid and K. Fitzpatrick
Influence of Leaf Tolerance Mechanisms and Rain on Boron Toxicity in Barley and Wheat
Plant Physiology, September 1, 2009; 151(1): 413 - 420.
[Abstract] [Full Text] [PDF]


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