Acquisition of aluminium tolerance by modification of a single gene in barley

Miho Fujii, Kengo Yokosho, Naoki Yamaji, Daisuke Saisho, Miki Yamane, Hirokazu Takahashi, Kazuhiro Sato, Mikio Nakazono and Jian Feng Ma ()
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Miho Fujii: Institute of Plant Science and Resources, Okayama University
Kengo Yokosho: Institute of Plant Science and Resources, Okayama University
Naoki Yamaji: Institute of Plant Science and Resources, Okayama University
Daisuke Saisho: Institute of Plant Science and Resources, Okayama University
Miki Yamane: Institute of Plant Science and Resources, Okayama University
Hirokazu Takahashi: Graduate School of Bioagricultural Sciences, Nagoya University
Kazuhiro Sato: Institute of Plant Science and Resources, Okayama University
Mikio Nakazono: Graduate School of Bioagricultural Sciences, Nagoya University
Jian Feng Ma: Institute of Plant Science and Resources, Okayama University

Nature Communications, 2012, vol. 3, issue 1, 1-9

Abstract: Abstract Originating from the Fertile Crescent in the Middle East, barley has now been cultivated widely on different soil types including acid soils, where aluminium toxicity is a major limiting factor. Here we show that the adaptation of barley to acid soils is achieved by the modification of a single gene (HvAACT1) encoding a citrate transporter. We find that the primary function of this protein is to release citrate from the root pericycle cells to the xylem to facilitate the translocation of iron from roots to shoots. However, a 1-kb insertion in the upstream of the HvAACT1 coding region occurring only in the Al-tolerant accessions, enhances its expression and alters the location of expression to the root tips. The altered HvAACT1 has an important role in detoxifying aluminium by secreting citrate to the rhizosphere. Thus, the insertion of a 1-kb sequence in the HvAACT1 upstream enables barley to adapt to acidic soils.

Date: 2012
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DOI: 10.1038/ncomms1726

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