Journal Article

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

Rob Reid

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 48, issue 12, pages 1673-1678
Published in print December 2007 | ISSN: 0032-0781
Published online December 2007 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcm159
Identification of Boron Transporter Genes Likely to be Responsible for Tolerance to Boron Toxicity in Wheat and Barley

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  • Biochemistry
  • Molecular and Cell Biology
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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; The nucleotide sequences reported in this paper have been submitted to GenBank under accession numbers EU220225 and EU223365.

Journal Article.  3369 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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