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Obligatory Reduction of Ferric Chelates in Iron Uptake by Soybeans
Open accessAbstract
The contrasting Fe(2+) and Fe(3+) chelating properties of the synthetic chelators ethylenediaminedi (o-hydroxyphenylacetate) (EDDHA) and 4,7-di(4-phenylsulfonate)-1, 10-phenanthroline (bathophenanthrolinedisulfonate) (BPDS) were used to determine the valence form of Fe absorbed by soybean roots supplied with Fe(3+)-chelates. EDDHA binds Fe(3+) strongly, but Fe(2+) weakly; BPDS binds Fe(2+) strongly but Fe(3+) weakly. Addition of an excess of BPDS to nutrient solutions containing Fe(3+)-chelates inhibited soybean Fe uptake-translocation by 99+%; [Fe(II) (BPDS)(3)](4-) accumulated in the nutrient solution. The addition of EDDHA caused little or no inhibition. These results were observed with topped and intact soybeans. Thus, separation and absorption of Fe from Fe(3+)-chelates appear to require reduction of Fe(3+)-chelate to Fe(2+)-chelate at the root, with Fe(2+) being the principal form of Fe absorbed by soybean.
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Citations
Cited by
AFT1: a mediator of iron regulated transcriptional control in Saccharomyces cerevisiae.
Yamaguchi‐Iwai, Y., Dancis, A., & Klausner, R. D. (1995) · The EMBO Journal · doi:10.1002/j.1460-2075.1995.tb07106.x · Cited by 358
Metadata
- Authors
- Chaney, R. L., Brown, J. C., & Tiffin, L. O.
- Venue
- Plant Physiology
- Publisher
- Oxford University Press (OUP)
- Published
- 1972-08-01
- Volume
- 50
- Issue
- 2
- Pages
- 208-213
- ISSN
- 0032-0889 (ISSN-L)
- 1532-2548
- OpenAlex
- W2032463444
- Cited by
- 688
- References
- 0
- FWCI
- 8.31
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Chaney, R. L., Brown, J. C., & Tiffin, L. O. (1972). Obligatory Reduction of Ferric Chelates in Iron Uptake by Soybeans. Plant Physiology. https://doi.org/10.1104/pp.50.2.208
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