Boron-toxicity tolerance in barley arising from efflux transporter amplification

Tim Sutton*, Ute Baumann, Julie Hayes, Nicholas C. Collins, Bu Jun Shi, Thorsten Schnurbusch, Alison Hay, Gwenda Mayo, Margaret Pallotta, Mark Tester, Peter Langridge

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

275 Scopus citations

Abstract

Both limiting and toxic soil concentrations of the essential micronutrient boron represent major limitations to crop production worldwide. We identified Bot1, a BOR1 ortholog, as the gene responsible for the superior boron-toxicity tolerance of the Algerian barley landrace Sahara 3771 (Sahara). Bot1 was located at the tolerance locus by high-resolution mapping. Compared to intolerant genotypes, Sahara contains about four times as many Bot1 gene copies, produces substantially more Bot1 transcript, and encodes a Bot1 protein with a higher capacity to provide tolerance in yeast. Bot1 transcript levels identified in barley tissues are consistent with a role in limiting the net entry of boron into the root and in the disposal of boron from leaves via hydathode guttation.

Original languageEnglish (US)
Pages (from-to)1446-1449
Number of pages4
JournalScience
Volume318
Issue number5855
DOIs
StatePublished - Nov 30 2007

ASJC Scopus subject areas

  • General

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