Competitive mobilization of phosphate and arsenate associated with goethite by root activity.

Competitive mobilization of phosphate and arsenate associated with goethite by root activity. Research Abstract Details 

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Competitive mobilization of phosphate and arsenate associated with goethite by root activity. Abstract Text:

Doris Vetterlein,Krisztian Szegedi,Juliane Ackermann, Mattusch,Heinz-Ulrich Neue,Hartmut Tanneberg,Reinhold Jahn,Doris Vetterlein,Krisztian Szegedi,Juliane Ackermann, Mattusch,Heinz-Ulrich Neue,Hartmut Tanneberg,Reinhold Jahn,

Arsenate (As V) is the predominant form of arsenic in soils under aerobic conditions and competes with the major plant nutrient phosphorus (P) in the form of phosphate (PV) not only for sorption sites on mineral surfaces in soil but also for root membrane transporters. Plants have evolved several mechanisms for the mobilization of PV in soils in response to P deficiency, such as the release of organic anions and protons. The aim of the present study was to test whether these mechanisms result in a simultaneous mobilization of arsenate and what would be the consequences for As transfer from soil to plant. The compartment system approach with Zea mays as model crop was chosen as an experimental setup. The system is equipped with micro suction cups and allowed us to investigate processes occurring in the vicinity of roots. As a case study, an artificial quartz substrate with well defined soil physical properties was fertilized, spiked with As V, and amended with increasing amounts of goethite (0, 1, and 4 g kg(-1) in treatments G-0, G-1, and G-4, respectively). The addition of goethite alleviated the As V-induced growth reduction and reduced As V transfer from the substrate to the plant but induced P deficiency at the same time. When low amounts of goethite (1 g kg(-1)) were added, plants mobilized PV but not As V, which might be related to differences in surface complexation reported for PV and As V. No mobilization of PV or As V was observed with the addition of higher amounts of goethite, probably because of decreasing competition between organic anions, PV, and As V for binding sites.

Competitive mobilization of phosphate and arsenate associated with goethite by root activity. Publishing Authors By Initials

D Vetterlein,K Szegedi,J Ackermann,J Mattusch,HU Neue,H Tanneberg,R Jahn,D Vetterlein,K Szegedi,J Ackermann,J Mattusch,HU Neue,H Tanneberg,R Jahn,

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PUBMED ID PMID:

MEDLINE DATE: 2007 Nov-Dec

Competitive mobilization of phosphate and arsenate associated with goethite by root activity. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of environmental quality

VOLUME: 36

Page Numbers: 1811-20

Journal Abbreviation: J. Environ. Qual.

ISSN: 0047-2425

DAY: 24

MONTH: 10

YEAR: 2007

Competitive mobilization of phosphate and arsenate associated with goethite by root activity. Information

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LANGUAGE: eng

NlmUniqueID: 330666

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AFFILIATION: UFZ Helmholtz Centre for Environmental Research, Dep. of Soil Ecology, Theodor-Lieser-Str. 4, 06120 Halle, Germany. doris.vetterlein@ufz.de

Country: United States

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MEDLINETA: J Environ Qual

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