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Gene Review

BOR1  -  boron transporter 1

Arabidopsis thaliana

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Disease relevance of BOR1

  • In several independently generated transgenic plants expressing BOR1 or BOR1-GFP under the control of the cauliflower mosaic virus 35S RNA promoter, root-to-shoot translocation of B was enhanced and shoot growth was greater under B-limiting conditions compared with wild-type plants [1].

High impact information on BOR1

  • Moreover, a fusion protein of BOR1 and green fluorescent protein (GFP) localized to the plasma membrane in transformed cells [2].
  • These results establish that endocytosis and degradation of BOR1 are regulated by B availability, to avoid accumulation of toxic levels of B in shoots under high-B supply, while protecting the shoot from B deficiency under B limitation [3].


  1. Improvement of seed yields under boron-limiting conditions through overexpression of BOR1, a boron transporter for xylem loading, in Arabidopsis thaliana. Miwa, K., Takano, J., Fujiwara, T. Plant J. (2006) [Pubmed]
  2. Arabidopsis boron transporter for xylem loading. Takano, J., Noguchi, K., Yasumori, M., Kobayashi, M., Gajdos, Z., Miwa, K., Hayashi, H., Yoneyama, T., Fujiwara, T. Nature (2002) [Pubmed]
  3. Endocytosis and degradation of BOR1, a boron transporter of Arabidopsis thaliana, regulated by boron availability. Takano, J., Miwa, K., Yuan, L., von Wirén, N., Fujiwara, T. Proc. Natl. Acad. Sci. U.S.A. (2005) [Pubmed]
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