Concentrations of Iron and Phytosiderophores in Xylem Sap of Iron-Deficient Barley Plants
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概要
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Barley (Hordeum vulgare L.cv.Minorimugi) plants were grown hydroponically in a greenhouse under natural sunlight. The xylem sap was collected from the barley plants showing iron (Fe) deficiency symptoms in order to determine the concentrations of the mugineic acid family of phytosiderophores (PS) and Fe. The compounds of PS in the xylem sap were identified, using TLC and HPLC, as mugineic acid (MA) and 2'-deoxymugineic acid (DMA). Feeding experiments were conducted to study the effects of PS on the concentrations of Fe and PS in the xylem sap of barley plants grown under Fe-deficient conditions. The concentration of Fe in the xylem sap of the Fe-deficient plants supplied with Fe^<3+> (30 μM) together with varying concentrations of PS (0 to 30 μM) increased with the increase in the PS concentration in the nutrient solution, indicating the specific role of PS in the acquisition of Fe^<3+> by the roots. On the other hand, PS concentration in the xylem sap increased at the highest external PS concentration (30 μM). The PS : Fe ratio in the xylem sap decreased with the increase in the concentration of PS supplied to the roots. The effects of the addition of 30 μM Fe^<3+> and equimolar concentration of PS or ethylene diamine tetraacetic acid (EDTA) to the Fe-deficient plants were compared. Plants supplied with PS showed a higher Fe concentration in the xylem sap than those which received EDTA, suggesting that PS were more effective than EDTA in the absorption and translocation of Fe^<3+>.
- 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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Alam Shah
岩手大農
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Kamei Shigeru
岩大農
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Kamei S
Faculty Of Agriculture Iwate University
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Kawai Shigenao
Faculty Of Agriculture Iwate University
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Kamei Shigeru
Iwate Univ. Morioka Jpn
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Kamei Shigeru
Faculty Of Agriculture Iwate University
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Ando Ryoji
Faculty Of Agriculture Iwate University
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Matsuda Yuuki
Faculty of Agriculture, Iwate University
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Kondo Seiichi
Faculty of Agriculture, Iwate University
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Ishizawa Ayako
Faculty of Agriculture, Iwate University
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Matsuda Yuuki
Faculty Of Agriculture Iwate University
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Ishizawa Ayako
Faculty Of Agriculture Iwate University
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Alam S
岩大農
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Kondo Seiichi
Faculty Of Agriculture Iwate University
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