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Improved tolerance to boron deficiency by enhanced expression of the boron transporter BOR2

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Title: Improved tolerance to boron deficiency by enhanced expression of the boron transporter BOR2
Authors: Takada, Shigeki Browse this author
Miwa, Kyoko Browse this author
Omori, Hiroyuki Browse this author
Fujiwara, Toru Browse this author
Naito, Satoshi Browse this author →KAKEN DB
Takano, Junpei Browse this author
Keywords: Arabidopsis thaliana
35S promoter
Issue Date: Jun-2014
Publisher: Taylor & Francis
Journal Title: Soil Science and Plant Nutrition
Volume: 60
Issue: 3
Start Page: 341
End Page: 348
Publisher DOI: 10.1080/00380768.2014.881705
Abstract: Boron (B) cross-links the pectin polysaccharide rhamnogalacturonan II (RG-II) and thus is important for cell wall structure in plants. B deficiency is an agricultural problem that causes significant losses of crop productivity worldwide. To address this, B deficiency-tolerant plants have been generated using B transporters. With the goal of further improving plant tolerance to low-B conditions, we generated transgenic Arabidopsis thaliana (L.) Heynh. with enhanced expression of BOR2, a B transporter that promotes cross-linking of RG-II and root elongation under low B supply. We generated a DNA construct containing the cauliflower mosaic virus 35S RNA promoter, a native promoter of BOR2, a BOR2 gene and green fluorescent protein (GFP) (Pro35S-BOR2: BOR2-GFP), and obtained three independent transgenic lines with relatively high levels of BOR2-GFP expression. In the transgenic lines, BOR2-GFP was expressed mainly in the lateral root caps in the meristem zone and in the epidermal cells in the elongation zone, similar to its expression when driven only by its native promoter. In the Pro35S-BOR2: BOR2-GFP lines, BOR2-GFP was also expressed in various cells in the maturation zone of roots and epidermal cells of shoots, where the expression was hardly detectable in ProBOR2: BOR2-GFP lines. The transgenic lines were cultured under various B concentrations on solid media and it was found that root growth of three lines and shoot growth of two lines were enhanced compared to wild-type plants under low-B conditions. This finding established that enhanced expression of BOR2 leads to improved root growth under low-B conditions. We also examined growth of the transgenic lines under hydroponic conditions. One of the three lines showed better growth and fertility under a low-B condition, while the wild type did not set seeds under the same condition, suggesting the potential utility of BOR2 expression in agricultural applications.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Soil Science and Plant Nutrition on 2014, available online:
Type: article (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高野 順平

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