title: Bioaugmentation with Pseudomonas sp. strain MHP41 promotes simazine attenuation and bacterial community changes in agricultural soils.
abstract: Bioremediation is an important technology for the removal of persistent organic pollutants from the environment. Bioaugmentation with the encapsulated Pseudomonas sp. strain MHP41 of agricultural soils contaminated with the herbicide simazine was studied. The experiments were performed in microcosm trials using two soils: soil that had never been previously exposed to s-triazines (NS) and soil that had >20 years of s-triazine application (AS). The efficiency of the bioremediation process was assessed by monitoring simazine removal by HPLC. The simazine-degrading microbiota was estimated using an indicator for respiration combined with most-probable-number enumeration. The soil bacterial community structures and the effect of bioaugmentation on these communities were determined using 16S RNA gene clone libraries and FISH analysis. Bioaugmentation with MHP41 cells enhanced simazine degradation and increased the number of simazine-degrading microorganisms in the two soils. In highly contaminated NS soil, bioaugmentation with strain MHP41 was essential for simazine removal. Comparative analysis of 16S rRNA gene clone libraries from NS and AS soils revealed high bacterial diversity. Bioaugmentation with strain MHP41 promoted soil bacterial community shifts. FISH analysis revealed that bioaugmentation increased the relative abundances of two phylogenetic groups (Acidobacteria and Planctomycetes) in both soils. Although members of the Archaea were metabolically active in these soils, their relative abundance was not altered by bioaugmentation.
authors.affiliation: Departamento de Química, Universidad Técnica Federico Santa María, Valparaíso, Chile.
authors.forename: Verónica
authors.initials: V
authors.lastname: Morgante
authors.forename: Arantxa
authors.initials: A
authors.lastname: López-López
authors.forename: Cecilia
authors.initials: C
authors.lastname: Flores
authors.forename: Myriam
authors.initials: M
authors.lastname: González
authors.forename: Bernardo
authors.initials: B
authors.lastname: González
authors.forename: Mónica
authors.initials: M
authors.lastname: Vásquez
authors.forename: Ramón
authors.initials: R
authors.lastname: Rosselló-Mora
authors.forename: Michael
authors.initials: M
authors.lastname: Seeger
mesh_terms: D000383:Agriculture; D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000254:growth & development*; D052918:Environmental Restoration and Remediation; D006540:Herbicides / Q000378:metabolism*; D011549:Pseudomonas / Q000145:classification / Q000502:physiology*; D012839:Simazine / Q000378:metabolism*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism / Q000633:toxicity; D013997:Time Factors
chemical_list: D006540:Herbicides; D012989:Soil Pollutants; D012839:Simazine