Miwa Kyoko, Takano Junpei, Omori Hiroyuki, Seki Motoaki, Shinozaki Kazuo, Fujiwara Toru
Biotechnology Research Center, University of Tokyo, Tokyo 113-8657, Japan.
Science. 2007 Nov 30;318(5855):1417. doi: 10.1126/science.1146634.
Reduced 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.
由于土壤中硼（B）含量达到有毒水平而导致作物生产力下降，这是全球粮食生产中的一个问题。据估计，澳大利亚南部高达17%的大麦产量损失是由硼毒性造成的。我们发现，AtBOR4（第一个被鉴定出的硼转运蛋白基因BOR1在拟南芥中的旁系同源基因）的表达可产生耐高硼水平的植株。BOR4是一种极性定位的硼酸盐输出蛋白，可增强硼从根部的外排。本研究为提高世界干旱地区分布的含过量硼土壤中的作物生产力奠定了基础。
