Indirect utilization of the phytosiderophore mugineic acid as an iron source to rhizosphere fluorescent Pseudomonas |
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| Authors: | Edouard Jurkevitch Yitzhak Hadar Yona Chen Mitsuo Chino Satoshi Mori |
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| Institution: | (1) Department of Plant Pathology and Microbiology, The Hebrew University of Jerusalem, Rehovot, Israel;(2) Department of Plant Pathology and Microbiology, The Seagram Center for Soil and Water Sciences, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, Israel;(3) Laboratory of Plant Nutrition and Fertilizers, Faculty of Agriculture, The University of Tokyo, Tokyo, Japan;(4) Department of Plant Pathology and Microbiology, The Hebrew University of Jerusalem, 76100 Rehovot, Israel |
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| Abstract: | The phytosiderophore mugineic acid (MA) was studied as a source of iron for rhizosphere fluorescent pseudomonads. 55Fe supplied as Fe-MA was taken up by Pseudomonas putida WCS358, B10 and St3 grown under iron deficient conditions. The uptake decreased when the bacteria were grown in the presence of iron. However, no differences in uptake were observed when a siderophore deficient mutant was tested. Since ligand exchange between pseudobactin and MA was shown to occur rapidly with a half-life of 2 h, MA mediated iron uptake probably proceeds through this indirect mechanism. The ecological implications of these findings are discussed. |
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| Keywords: | iron uptake mugineic acid phytosiderophore Pseudomonas putida |
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