Role of overexpressed BOR4, a boron exporter, in tolerance to high level of boron in shoots(Plant nutrition)
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概要
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High boron (B) tolerance is an important trait for crop production in high-B soils. We previously reported that overexpression of BOR4, an Arabidopsis thaliana B exporter, conferred high B tolerance in A. thaliana. This improvement appeared to be mainly due to the decreased B concentrations in roots through BOR4-mediated exclusion of B. In the present study, we describe a novel role of overexpressed BOR4 in shoots for high B tolerance. We compared shoot growth of wild type A. thaliana and transgenic plants moderately overexpressing BOR4 in relation to B concentration in shoots. It was found that growths and chlorophyll accumulation of shoots containing similar levels of B are better in the transgenic plants than the wild type. This finding established that BOR4-overexpressing plants are more capable of expanding leaves and accumulating chlorophyll in the presence of high B in shoot tissues. BOR4-GFP was found to be localized to plasma membrane in leaf epidermis cells. We suggest that overexpressed BOR4 alters B distribution in leaves by exporting B from the cytoplasm to the apoplast, leading to enhancement of high B tolerance in shoots.
著者
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Miwa Kyoko
Biotechnology Research Center The University Of Tokyo
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Miwa Kyoko
Biotechnology Research Center University Of Tokyo
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Fujiwara Toru
Biotechnology Research Center The University Of Tokyo
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Fujiwara Toru
Biotechnology Research Center University Of Tokyo:graduate School Of Agricultural And Life Sciences
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Miwa Kyoko
Creative Research Institution Hokkaido University:biotechnology Research Center University Of Tokyo
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Miwa Kyoko
Creative Res. Institution Hokkaido Univ.
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