Influence of chelating ligands on bioavailability and mobility of iron in plant growth media and their effect on radish growth

Hasegawa, H; Rahman, MA; Saitou, K; Kobayashi, M; Okumura, C

Influence of chelating ligands on bioavailability and mobility of iron in plant growth media and their effect on radish growth

Hasegawa, H Rahman, MA

Saitou, K Kobayashi, M Okumura, C

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Publication Type:: Journal Article
Citation:: Environmental and Experimental Botany, 2011, 71 (3), pp. 345 - 351
Issue Date:: 2011-07-01

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Field	Value	Language
dc.contributor.author	Hasegawa, H	en_US
dc.contributor.author	Rahman, MA https://orcid.org/0000-0002-8065-0286	en_US
dc.contributor.author	Saitou, K	en_US
dc.contributor.author	Kobayashi, M	en_US
dc.contributor.author	Okumura, C	en_US
dc.date.issued	2011-07-01	en_US
dc.identifier.citation	Environmental and Experimental Botany, 2011, 71 (3), pp. 345 - 351	en_US
dc.identifier.issn	0098-8472	en_US
dc.identifier.uri	http://hdl.handle.net/10453/18090
dc.description.abstract	In this study, the effects of chelating ligands on iron movement in growth medium, iron bioavailability, and growth of radish sprouts (Raphanus sativus) were investigated. Iron is an important nutrient for plant growth, yet the insoluble state of iron hydroxides in alkaline conditions decreases its bioavailability. Iron chelates increase iron uptake and have been used in agriculture to correct iron chlorosis. While previous studies have reported the effects of chelating ligands on iron solubility and bioavailability, the present study elucidates the pattern of iron movement by chelating ligands in plant growth medium. The apparent mobility of iron in growth medium was calculated using a '4-box' model. Ethylenediaminedisuccinic acid (EDDS) and hydroxy-iminodisuccinic acid (HIDS) produced the highest apparent mobility of iron from the bottom layer of the medium (initially 10-4M Fe(III)) to the upper layer (no iron), followed by glutamatediacetic acid (GLDA), ethylenediaminetetraacetic acid (EDTA), methylglycinediacetic acid (MGDA), and iminodisuccinic acid (IDS). Iron movement in the growth medium was influenced by the chelating ligand species, pH, and ligand exposure time. The iron uptake and growth of radish sprouts were related to the iron mobility produced by the chelating ligands. These results suggest that, in alkaline media, chelating ligands dissolve the hardly soluble iron hydroxide species, thus increasing iron mobility, iron uptake, and plant growth. HIDS, which is biodegradable, was one of the most effective ligands studied; therefore, this compound would be a good alternative to other environmentally persistent chelating ligands. © 2011 Elsevier B.V.	en_US
dc.relation.ispartof	Environmental and Experimental Botany	en_US
dc.relation.isbasedon	10.1016/j.envexpbot.2011.01.004	en_US
dc.subject.classification	Plant Biology & Botany	en_US
dc.title	Influence of chelating ligands on bioavailability and mobility of iron in plant growth media and their effect on radish growth	en_US
dc.type	Journal Article
utslib.citation.volume	3	en_US
utslib.citation.volume	71	en_US
utslib.for	0703 Crop and Pasture Production	en_US
utslib.for	0503 Soil Sciences	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
utslib.for	07 Agricultural and Veterinary Sciences	en_US
dc.location.activity	Mebourne, Australia
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	open_access
pubs.issue	3	en_US
pubs.publication-status	Published	en_US
pubs.volume	71	en_US

Abstract:

In this study, the effects of chelating ligands on iron movement in growth medium, iron bioavailability, and growth of radish sprouts (Raphanus sativus) were investigated. Iron is an important nutrient for plant growth, yet the insoluble state of iron hydroxides in alkaline conditions decreases its bioavailability. Iron chelates increase iron uptake and have been used in agriculture to correct iron chlorosis. While previous studies have reported the effects of chelating ligands on iron solubility and bioavailability, the present study elucidates the pattern of iron movement by chelating ligands in plant growth medium. The apparent mobility of iron in growth medium was calculated using a '4-box' model. Ethylenediaminedisuccinic acid (EDDS) and hydroxy-iminodisuccinic acid (HIDS) produced the highest apparent mobility of iron from the bottom layer of the medium (initially 10-4M Fe(III)) to the upper layer (no iron), followed by glutamatediacetic acid (GLDA), ethylenediaminetetraacetic acid (EDTA), methylglycinediacetic acid (MGDA), and iminodisuccinic acid (IDS). Iron movement in the growth medium was influenced by the chelating ligand species, pH, and ligand exposure time. The iron uptake and growth of radish sprouts were related to the iron mobility produced by the chelating ligands. These results suggest that, in alkaline media, chelating ligands dissolve the hardly soluble iron hydroxide species, thus increasing iron mobility, iron uptake, and plant growth. HIDS, which is biodegradable, was one of the most effective ligands studied; therefore, this compound would be a good alternative to other environmentally persistent chelating ligands. © 2011 Elsevier B.V.

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