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Research Project:
GENOMIC APPROACHES TO IMPROVING TRANSPORT AND DETOXIFICATION OF SELECTED MINERAL ELEMENTS IN CROP PLANTS
Location: Plant, Soil and Nutrition Research
Title: A promoter swap strategy between the AtALMT and AtMATE genes increased arabidopsis aluminum resistance and improved carbon use efficiency for aluminum resistance
Authors
Submitted to: Plant Journal
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: March 9, 2012
Publication Date: July 12, 2012
Citation: Liu, J., Luo, X., Shaff, J., Liang, C., Jia, X., Li, Z., Magalhaes, J., Kochian, L.V. 2012. A promoter swap strategy between the AtALMT and AtMATE genes increased arabidopsis aluminum resistance and improved carbon use efficiency for aluminum resistance. Plant Journal. 71(2):327-337.
Interpretive Summary: Over 20 percent of the U.S> land area and approximately 50 percent of the world’s arable lands are acidic (pH
Technical Abstract:
In Arabidopsis, aluminum (Al)-activated AtALMT1-mediated root malate exudation plays a major role in Al tolerance, while Al-activated AtMATE-mediated citrate exudation plays a much smaller role. In this study, we demonstrate that the levels of Al-activated root organic acid exudation are closely correlated with the transcriptional levels of the organic acid transporter genes, AtALMT1 and AtMATE. We found here that the AtALMT1 promoter is stronger than the AtMATE promoter. From this result, in conjunction with the fact that citrate is a much more effective Al chelator than malate, we adopted a promoter swap strategy to test if the expression of the AtMATE gene driven by the strong AtALMT1 promoter will result in increased Al tolerance in Arabidopsis. Our results indicated that the AtALMT1:AtMATE promoter swap not only increased Al tolerance of the transgenic plants, but also enhanced carbon usage efficiency for Al tolerance.
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