Journal
PLANT CELL
Volume 26, Issue 5, Pages 2234-2248Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.114.124628
Keywords
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Funding
- National Science Foundation of China [NSFC-31170229, NSFC-31371244]
- Hunan Natural Science Foundation [12JJ6021]
- Hunan Education Commission [12A096]
- Hunan Provincial Construct Program of the Key Discipline in Ecology
- Hunan Provincial Cooperative Innovation Center of Engineering, and New Products for Developmental Biology
- MOE 985 Project and IRT1020 of China
- U.S. National Science Foundation
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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.
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