<i>Arabidopsis</i>Transporter MGT6 Mediates Magnesium Uptake and Is Required for Growth under Magnesium Limitation
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- Dandan Mao
- College of Life Sciences, Hunan Normal University, Changsha 410081, China
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- Jian Chen
- College of Life Sciences, Hunan Normal University, Changsha 410081, China
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- Lianfu Tian
- College of Life Sciences, Hunan Normal University, Changsha 410081, China
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- Zhenhua Liu
- College of Life Sciences, Hunan Normal University, Changsha 410081, China
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- Lei Yang
- Nanjing University–Nanjing Forestry University Joint Institute for Plant Molecular Biology, State Key Laboratory for Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing 210093, China
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- Renjie Tang
- Department of Plant and Microbial Biology, University of California, Berkeley, California 94720
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- Jian Li
- College of Life Sciences, Hunan Normal University, Changsha 410081, China
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- Changqing Lu
- College of Life Sciences, Hunan Normal University, Changsha 410081, China
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- Yonghua Yang
- Nanjing University–Nanjing Forestry University Joint Institute for Plant Molecular Biology, State Key Laboratory for Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing 210093, China
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- Jisen Shi
- Nanjing University–Nanjing Forestry University Joint Institute for Plant Molecular Biology, MOF Key Laboratory of Forest Genetics and Biotechnology, Nanjing Forestry University, Nanjing 210037, China
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- Liangbi Chen
- College of Life Sciences, Hunan Normal University, Changsha 410081, China
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- Dongping Li
- College of Life Sciences, Hunan Normal University, Changsha 410081, China
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- Sheng Luan
- Nanjing University–Nanjing Forestry University Joint Institute for Plant Molecular Biology, State Key Laboratory for Pharmaceutical Biotechnology, College of Life Sciences, Nanjing University, Nanjing 210093, China
抄録
<jats:title>Abstract</jats:title><jats:p>Although magnesium (Mg2+) is the most abundant divalent cation in plant cells, little is known about the mechanism of Mg2+ uptake by plant roots. Here, we report a key function of Magnesium Transport6 (MGT6)/Mitochondrial RNA Splicing2-4 in Mg2+ uptake and low-Mg2+ tolerance in Arabidopsis thaliana. MGT6 is expressed mainly in plant aerial tissues when Mg2+ levels are high in the soil or growth medium. Its expression is highly induced in the roots during Mg2+ deficiency, suggesting a role for MGT6 in response to the low-Mg2+ status in roots. Silencing of MGT6 in transgenic plants by RNA interference (RNAi) resulted in growth retardation under the low-Mg2+ condition, and the phenotype was restored to normal growth after RNAi plants were transferred to Mg2+-sufficient medium. RNAi plants contained lower levels of Mg2+ compared with wild-type plants under low Mg2+ but not under Mg2+-sufficient conditions. Further analysis indicated that MGT6 was localized in the plasma membrane and played a key role in Mg2+ uptake by roots under Mg2+ limitation. We conclude that MGT6 mediates Mg2+ uptake in roots and is required for plant adaptation to a low-Mg2+ environment.</jats:p>
収録刊行物
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- The Plant Cell
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The Plant Cell 26 (5), 2234-2248, 2014-05-01
Oxford University Press (OUP)