著者

TAKAGI Sei-ichi

出版者

一般社団法人日本土壌肥料学会

雑誌

Soil science and plant nutrition (ISSN:00380768)

巻号頁・発行日

vol.22, no.4, pp.423-433, 1976-12

被引用文献数

29

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The root washings of water-cultured oat and rice (non-sterile) contained some sort of amphoteric, iron-solubilizing chelating (or complexing) compound(s), which could be separated into a "cationic fraction" by elution in a cation exchanger column with 1N NH_4OH. In oats, the release of the chelator into the washings greatly increased under iron-stress conditions. Under the same condition "iron-inefficient" rice plants also increased the release of the chelator, though to a much less extent than did the oats. Further examination of the "cationic fraction" revealed that this chelator may be a heat-stable, acid-hydrolyzable non-macromolecule of extraordinarily high polarity. In the absence of interfering ions, the chelator was able to solubilize hydrated Fe (III) oxide effectively within a range of pH 4 to 9. Its Fe-solubilizing action was inhibited by the presence of divalent metals, the extent being in the order, Cu>Co≧Zn>Mn>Ca (no inhibition).