Dissolution of ferric phosphate by alfalfa (Medicago sativa L.) root exudates |
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| Authors: | Masaoka Y Kojima M Sugihara S Yoshihara T Koshino M Ichihara A |
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| Institution: | (1) Department of Environment, National Grassland Research Institute, 329-27 Tochigi, Japan;(2) Present address: Department of Agro-Environmental Management, 861-11 Kumamoto, Japan;(3) The Institute of Agro-environmental Science, 305 Tsukuba, Japan;(4) Department of Agriculture, Hokkaido University, 060 Sapporo, Japan |
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| Abstract: | Alfalfa (Medicago sativa L.) was grown in hydroponic culture to investigate adaptation to Fe-deficiency. Root exudates released into the nutrient solution from Fe-deficient plants were trapped and condensed on an amberlite XAD-4 resin column. The diethyl ether fraction of these exudates dissolved ferric phosphate remarkably. The dissolving capability was about 62 times higher than that of root exudates obtained from Fe-sufficient plants in complete nutrient solution. The Fe-dissolving compound was separated and identified. It was a new natural compound with molecular formula C14H10O5 and was identified as 2-(3 ,5-dihydroxyphenyl)-5,6-dihydroxybenzofuran by means of mass spectrometry and 1H-nuclear magnetic resonance. This new compound worked as a phytoalexin and inhibited completely the fungal growth of Fusarium oxysporum f. sp. phaseoli. |
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| Keywords: | alfalfa Fe-deficiency ferric phosphate Fusarium oxysporum f sp phaseoli Medicago sativa L root exudate |
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