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Environ Microbiol ; 9(6): 1511-22, 2007 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-17504488

RESUMO

Among 17 molecules structurally related to N-acylhomoserine lactone (NAHL), gamma-caprolactone (GCL), 6-caprolactone (6CL) and 4-heptanolide (HTN) were found to stimulate the degradation of NAHL by bacterial communities recovered from bulk and rhizospheric soils. In the 6CL-, GCL- and HTN-treated bacterial consortia, the NAHL-degrading bacteria were more abundant than in control (mannitol-treated) consortia. Moreover, the GCL- and HTN-consortia showed a biocontrol activity against Pectobacterium atrosepticum in soft rot assays with tubers of Solanum tuberosum. When GCL was applied to hydroponic cultures of S. tuberosum, a significant increase of the ratio of NAHL-degrading bacteria among total cultivable bacteria was observed in several independent experiments. Most of these bacteria, the growth of which was stimulated by GCL amendment, were also able to use GCL as a sole carbon source. They belong to the Rhodococcus and Delftia genera. DGGE analysis revealed that GCL treatments affected the structure of bacterial communities. This work highlights the possibility to manage the NAHL-degrading bacteria in a complex environment such as rhizosphere.


Assuntos
Delftia/crescimento & desenvolvimento , Raízes de Plantas/microbiologia , Percepção de Quorum , Rhodococcus/crescimento & desenvolvimento , Solanum tuberosum/microbiologia , 4-Butirolactona/análogos & derivados , 4-Butirolactona/química , 4-Butirolactona/metabolismo , Biodegradação Ambiental , Delftia/metabolismo , Controle Biológico de Vetores , Rhodococcus/metabolismo , Microbiologia do Solo
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