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Plant and Cell Physiology Advance Access published online on November 14, 2007
Plant and Cell Physiology, 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 e-mail: journals.permissions@oxfordjournals.org

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: Rob Reid. School of Earth and Environmental Sciences, University of Adelaide, Adelaide 5005 Australia. Tel: +61.8.83035290, FAX: +61.8.83036222, E-mail: robert.reid{at}adelaide.edu.au


  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: BOR genes - boron tolerance - boron toxicity - Hordeum vulgare - membrane transporter - Triticum aestivum

(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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