The significance of biodegradable methylglycinediacetic acid (MGDA) for iron and arsenic bioavailability and uptake in rice plant

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dc.contributor.author Rahman, Mohammad en_US
dc.contributor.author Rahman, M. en_US
dc.contributor.author Maki, Teruya en_US
dc.contributor.author Hasegawa, Hiroshi en_US
dc.contributor.editor en_US
dc.date.accessioned 2014-04-03T01:23:00Z
dc.date.available 2014-04-03T01:23:00Z
dc.date.issued 2012 en_US
dc.identifier 2012001254 en_US
dc.identifier.citation Hasegawa, Hiroshi et al. 2012, 'The significance of biodegradable methylglycinediacetic acid (MGDA) for iron and arsenic bioavailability and uptake in rice plant', Soil Science and Plant Nutrition, vol. 58, no. 5, pp. 627-636. en_US
dc.identifier.issn 0038-0768 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/22828
dc.description.abstract Methylglycinediacetic acid (MGDA) is a readily biodegradable complexing agent in compliance with Organization for Economic Cooperation and Development standards. In the present study, the use of MGDA for iron (Fe) and arsenic (As) bioavailability and uptake by rice plants (Oryza sativa L.) was investigated. The highest plant biomass was observed at pH 7, and the growth of rice seedlings decreased significantly (pa??<a??0.05) with increasing pH of the nutrient solution. This might be due to Fe deficiency to the plant at alkaline pH. When rice seedlings were grown with different concentrations of MGDA (0.1, 0.25, 0.5, 1.0, 2.5, and 5a??mM), the highest plant biomass was observed at 0.25a??mM MGDA, while further increases of the ligand concentration decreased the plant growth. Fe concentrations on rice root surfaces decreased gradually with increasing MGDA concentrations in the growing medium, while Fe concentrations in rice roots and shoots increased with increasing MGDA concentrations up to 0.25a??mM and then decreased gradually. This indicates that the concentration of the chelating ligand influences Fe uptake in the plant. Arsenic concentrations on rice root surfaces decreased, while As concentrations in roots and shoots increased with the addition of MGDA in the growing medium, indicating that the ligand enhanced As bioavailability and uptake in rice. The mechanism behind the MGDA effect on Fe and As uptake in plant is likely to be due to that Fe exists mostly in insoluble particulate forms [e.g., ferric oxide (Fe2O3), ferric hydroxide (Fe(OH)3) and ferric oxyhydroxide (FeOOH)] at neutral or alkaline pH, and the soluble [e.g., ferric ion (Fe3+), iron hydroxide ion (Fe(OH)2+) and iron dihydroxide ion (Fe(OH)2+] and apparently soluble (colloidal) fractions of Fe are increased at moderate concentrations of the ligand that increases Fe bioavailability. Since arsenate [As(V)] binds to the insoluble Fe-oxides/hydroxides, the binding sites for As(V) decreases with the in en_US
dc.language en_US
dc.publisher Wiley-Blackwell en_US
dc.relation.isbasedon http://dx.doi.org/10.1080/00380768.2012.717246 en_US
dc.title The significance of biodegradable methylglycinediacetic acid (MGDA) for iron and arsenic bioavailability and uptake in rice plant en_US
dc.parent Soil Science and Plant Nutrition en_US
dc.journal.volume 58 en_US
dc.journal.number 5 en_US
dc.publocation Japan en_US
dc.identifier.startpage 627 en_US
dc.identifier.endpage 636 en_US
dc.cauo.name SCI.School of the Environment en_US
dc.conference Verified OK en_US
dc.for 070300 en_US
dc.personcode 112851 en_US
dc.personcode 0000070303 en_US
dc.personcode 0000070299 en_US
dc.personcode 0000070288 en_US
dc.percentage 34 en_US
dc.classification.name Crop and Pasture Production en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords iron bioavailability, arsenic uptake, methylglycinediacetic acid (MGDA), Fe-oxides/hydroxides, rice plant (Oryza sativa L.). en_US


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