Journal
PLANT AND SOIL
Volume 384, Issue 1-2, Pages 69-77Publisher
SPRINGER
DOI: 10.1007/s11104-014-2197-3
Keywords
Radioisotope; Kinetic study; Magnesium; Mg-28; Rice; Uptake
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Funding
- Japan Society for the Promotion of Science [24780056]
- Funding Program for Next Generation World-Leading Researchers (NEXT Program) [GS-007]
- Grants-in-Aid for Scientific Research [24780056] Funding Source: KAKEN
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The mechanisms underlying magnesium (Mg) uptake by plant roots remain to be fully elucidated. In particular, there is little information about the effects of Mg deficiency on Mg uptake activity. A Mg uptake kinetic study is essential for better understanding the Mg uptake system. We performed a Mg uptake tracer experiment in rice plants using (28) Mg. Mg uptake was mediated by high- and low-affinity transport systems. The K (m) value of the high-affinity transport system was approximately 70 mu M under Mg-deficient conditions. The Mg uptake activity was promoted by Mg deficiency, which in turn fell to the basal level after 5- min of Mg resupply. The induced uptake rate was inhibited by ionophore treatment, suggesting that an energy-dependent uptake system is enhanced by Mg deficiency. The Mg uptake changes rapidly with Mg conditions in rice, as revealed by a (28) Mg tracer experiment. This technique is expected to be applicable for Mg uptake analyses, particularly in mutants or other lines.
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