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BreviaPlants Tolerant of High Boron LevelsReduced crop productivity due to soils containing toxic levels of boron (B) is a worldwide problem in food production. It is estimated that up to 17% of the barley yield losses in southern Australia are caused by B toxicity. We found that the expression of AtBOR4, an Arabidopsis paralog of BOR1, the first identified boron transporter gene, generates plants that are tolerant of high B levels. BOR4 is a polarly localized borate exporter that enhances B efflux from roots. The present study is a foundation for the improvement of crop productivity in soils containing excess B, which are distributed in arid areas of the world.
1 Biotechnology Research Center, University of Tokyo, Tokyo 113-8657, Japan. * To whom correspondence should be addressed. E-mail: atorufu{at}mail.ecc.u-tokyo.ac.jp
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Science. ISSN 0036-8075 (print), 1095-9203 (online)