The characteristics of rhizosphere microbes associated with plants in arsenic-contaminated soils from cattle dip sites

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Show simple item record Chopra, BK Bhat, S Mikheenko, IP Xu, Z Yang, Y Luo, X Chen, H van Zwieten, L Lilley, R Zhang, R 2012-02-02T06:35:51Z 2007-01
dc.identifier.citation The Science of the Total Environment, 2007, 378 (3), pp. 331 - 342
dc.identifier.issn 0048-9697
dc.identifier.other C1UNSUBMIT en_US
dc.description.abstract Soil microorganisms and plants were studied in samples of arsenic-contaminated soil from two cattle dip sites. The aim was to delineate the parameters that will determine the feasibility of future remediation by growing arsenic-accumulating plants, including the identity and characteristics of some rhizosphere soil microbes. The soil samples contained high total, but low soluble arsenic concentrations which, together with other properties, resembled the previously reported characteristics of dip-site soils from this region of rural Australia. A glasshouse trial demonstrated that dip-site rhizosphere microbes promoted arsenic accumulation by the grass Agrostis tenuis on contaminated dip-site soil without inhibition of growth. The arsenic content of the shoots was increased by 45%. We studied the colonization of roots of dip-site plants by mycorrhizal fungi and tentatively identified six genera of other fungi present in the soil samples. Two plant species growing at the sites, Kikuyu grass (the most abundant plant) and Rainbow fern, exhibited mixed infections of their roots by endomycorrhizal fungi (tentatively identified as Acaulospora and Gigaspora) and by soilborn pathogens. Five rhizosphere bacteria were identified to genus level and we determined the effect of arsenic on their growth. The two most prevalent strains differed greatly in their growth sensitivity to arsenate; Arthrobacter sp. being the most sensitive while Ochrobactrum sp. exhibited exceptional resistance to arsenate. Of the other, less prevalent strains, two were Bacillus spp. and the last, Serratia sp., was the most resistant to arsenite. These findings show the importance of understanding plantsoil microbe interactions for developing future strategies aimed at a phytoremediation-based approach to removing arsenic from soil at dip sites.
dc.publisher Elsevier B.V.
dc.relation.isbasedon 10.1016/j.scitotenv.2007.02.036
dc.title The characteristics of rhizosphere microbes associated with plants in arsenic-contaminated soils from cattle dip sites
dc.type Journal Article
dc.parent The Science of the Total Environment
dc.journal.volume 3
dc.journal.volume 378
dc.journal.number 3 en_US
dc.publocation Netherlands en_US
dc.publocation National Portrait Gallery, Canberra
dc.identifier.startpage 331 en_US
dc.identifier.endpage 342 en_US SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0503 Soil Sciences
dc.personcode 995493
dc.percentage 100 en_US Soil Sciences en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US 2011-09-11
dc.location.activity en_US
dc.description.keywords Arsenic; Soil contamination; Cattle dip site; Rhizosphere; Bacteria; Mycorrhizae en_US
dc.description.keywords Arsenic
dc.description.keywords Soil contamination
dc.description.keywords Cattle dip site
dc.description.keywords Rhizosphere
dc.description.keywords Bacteria
dc.description.keywords Mycorrhizae
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
utslib.collection.history Closed (ID: 3)

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