Role of Boron in Plant Growth and its Transport Mechanisms

  • Kyoko Miwa
  • Toru FujiwaraEmail author
Part of the Plant Cell Monographs book series (CELLMONO, volume 17)


In the last decade, molecular understandings of boron transport and boron function in plants have greatly advanced. Crosslinking of pectic polysaccharide rhamonogalacturonan-II (RG-II) via boron was shown to be essential for normal plant growth. Two types of boron (B) transport molecules, BORs and NIPs, localized to plasma membrane were identified from Arabidopsis thaliana. BOR1 was identified as the first borate/boric acid transporter in the biological systems. It efficiently exports B into xylem, and BOR4, a BOR1 homolog, excludes high concentrations of B out of the cells for high B tolerance. NIP5;1 and NIP6;1 are channels for boric acid to facilitate B flow from soil into root cells and the preferential distribution of B to growing shoot tissues, respectively. In recent years, compelling evidence has accumulated for the fact that B is also required for some bacteria and animals. A. thaliana BOR1 led to the identification of a Na+-coupled borate transporter NaBC1, a mammalian BOR1 homolog. Further understanding of physiological function of B and transport mechanisms will expand our perspectives of B in biology.


Pollen Tube Inductively Couple Plasma Mass Spectrometry Boric Acid Major Intrinsic Protein Chara Coralline 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.Hokkaido University, Creative Research Initiative Sousei Address Kita-kuSapporoJapan
  2. 2.Biotechnology Research CenterUniversity of TokyoYayoi, Bunkyo-kuJapan
  3. 3.SORST, JSTChiyoda-KuJapan

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