Effects of Excess Manganese and Metal Chelators on Micronutrient Concentrations in the Xylem Sap of Iron-Deficient Barley Plants
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概要
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Barley (Hordeum vulgare L.) plants were grown hydroponically in a greenhouse for 14 d under Fe-deficient conditions before treatment for 3 h with excess Mn (25 μM) and equimolar amounts of plant-borne (phytosiderophores, PS) or synthetic (ethylene diamine tetraacetic acid, EDTA) metal chelators. The xylem sap was collected for 3 h and analyzed for PS, Fe, Mn, Zn, Cu, and citrate concentrations. Excess Mn in the feeding medium decreased the concentrations of PS, Fe, Mn, Zn, and Cu in the xylem sap. Addition of 25 μM Mn and an equimolar amount of PS to the feeding medium increased the concentrations of PS, Fe, Zn, and Cu in the xylem sap, while EDTA decreased the concentrations of PS and the above nutrients. Excess Mn in the feeding medium increased the Mn concentration in the xylem sap and this increase was more pronounced with the addition of PS to the feeding medium, while EDTA had a depressing effect. These findings suggested that the roots of Fe-deficient barley plants can enhance the absorption and/or translocation of both Mn^<2+> and a PS-Mn complex. Addition of excess Mn to the feeding medium, irrespective of chelators, did not affect the xylem citrate concentration, indicating that citrate may not contribute to the translocation of metal micronutrients. In the xylem sap of Fe-deficient barley plants, the concentrations of metal micronutrients were positively correlated with the concentrations of PS.
- 社団法人日本土壌肥料学会の論文
著者
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Alam Shah
Faculty Of Agriculture Iwate University
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Kawai Shigenao
Faculty Of Agriculture Iwate University
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Kamei Shigeru
Faculty Of Agriculture Iwate University
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Shah Alam
Faculty of Agriculture, Iwate University
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Shah Alam
Faculty Of Agriculture Iwate University
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