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Interactions of three soil bacteria species with phyllosilicate surfaces in hybrid silica gels.
Oulkadi, Djihad; Balland-Bolou-Bi, Clarisse; Billard, Patrick; Kitzinger, Geraldine; Parrello, Damien; Mustin, Christian; Banon, Sylvie.
Afiliação
  • Oulkadi D; Université de Lorraine, LIEC, UMR CNRS 7360, Vandoeuvre-lès-Nancy, France.
FEMS Microbiol Lett ; 354(1): 37-45, 2014 May.
Article em En | MEDLINE | ID: mdl-24628667
To simulate iron consumption in soils, iron leaching from silicate minerals due to three heterotrophic bacterial strains and a chemical treatment was studied using hybrid silica gel (HSG) doped with two phyllosilicates, nontronite (NAu-2) or low-iron-content montmorillonite (SWy-2). HSG methodology, a novel way of separating bacteria cells from a colloidal mineral source, consisted in embedding colloidal mineral particles into an amorphous porous silica matrix using a classical sol-gel procedure. Pantoae agglomerans PA1 and Rahnella aquatilis RA1 were isolated from silicate-rich soils, that is, beech and wheat rhizospheres (Vosges, France); Burkholderia sp. G5 was selected from acidic and nutrient-poor podzol soils (Vosges, France). Fe release from clay minerals and production of bacterial metabolites, that is, low molecular weight organic acids (LMWOA) and siderophores, were monitored. Two LMWOA profiles were observed with major gluconate production (> 9000 µM) for Burkholderia sp. G5 and moderate production of lactate, acetate, propionate, formate, oxalate, citrate, and succinate (< 300 µM) for R. aquatilis RA1 and P. agglomerans PA1. HSG demonstrated its usefulness in revealing clay mineral-microorganisms interactions. The effect of bacterial exsudates was clearly separated from physical contact effect.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Microbiologia do Solo / Burkholderia / Rahnella / Enterobacteriaceae / Sílica Gel Idioma: En Revista: FEMS Microbiol Lett Ano de publicação: 2014 Tipo de documento: Article País de afiliação: França País de publicação: Reino Unido

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Microbiologia do Solo / Burkholderia / Rahnella / Enterobacteriaceae / Sílica Gel Idioma: En Revista: FEMS Microbiol Lett Ano de publicação: 2014 Tipo de documento: Article País de afiliação: França País de publicação: Reino Unido