Arabidopsis boron transporter for xylem loading

Junpei Takano, Kyotaro Noguchi, Miho Yasumori, Masaharu Kobayashi, Zofia Gajdos, Kyoko Miwa, Hiroaki Hayashi, Tadakatsu Yoneyama and Toru Fujiwara ()
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Junpei Takano: Graduate School of Agricultural and Life Sciences, The University of Tokyo
Kyotaro Noguchi: Graduate School of Agricultural and Life Sciences, The University of Tokyo
Miho Yasumori: Graduate School of Agricultural and Life Sciences, The University of Tokyo
Masaharu Kobayashi: Graduate School of Agricultural and Life Sciences, The University of Tokyo
Zofia Gajdos: Graduate School of Agricultural and Life Sciences, The University of Tokyo
Kyoko Miwa: Graduate School of Agricultural and Life Sciences, The University of Tokyo
Hiroaki Hayashi: Graduate School of Agricultural and Life Sciences, The University of Tokyo
Tadakatsu Yoneyama: Graduate School of Agricultural and Life Sciences, The University of Tokyo
Toru Fujiwara: Graduate School of Agricultural and Life Sciences, The University of Tokyo

Nature, 2002, vol. 420, issue 6913, 337-340

Abstract: Abstract Boron deficiency hampers the productivity of 132 crops in more than 80 countries1. Boron is essential in higher plants primarily for maintaining the integrity of cell walls2,3,4 and is also beneficial and might be essential in animals5 and in yeast6. Understanding the molecular mechanism(s) of boron transport is crucial for alleviating boron deficiency. Here we describe the molecular identification of boron transporters in biological systems. The Arabidopsis thaliana mutant bor1-1 is sensitive to boron deficiency7,8. Uptake studies indicated that xylem loading is the key step for boron accumulation in shoots with a low external boron supply and that the bor1-1 mutant is defective in this process. Positional cloning identified BOR1 as a membrane protein with homology to bicarbonate transporters in animals. Moreover, a fusion protein of BOR1 and green fluorescent protein (GFP) localized to the plasma membrane in transformed cells. The promoter of BOR1 drove GFP expression in root pericycle cells. When expressed in yeast, BOR1 decreased boron concentrations in cells. We show here that BOR1 is an efflux-type boron transporter for xylem loading and is essential for protecting shoots from boron deficiency.

Date: 2002
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DOI: 10.1038/nature01139

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