(R,S)-dichlorprop herbicide in agricultural soil induces proliferation and expression of multiple dioxygenase-encoding genes in the indigenous microbial community.
Environ Microbiol
; 13(6): 1513-23, 2011 Jun.
Article
em En
| MEDLINE
| ID: mdl-21418495
ABSTRACT
We investigated the effect of (R,S)-dichlorprop herbicide addition to soil microcosms on the degrading indigenous microbial community by targeting multiple α-ketoglutarate-dependent (α-KG) dioxygenase-encoding genes (rdpA, sdpA and tfdA group I) at both gene and transcript level. The soil microbial community responded with high growth of potential degraders as measured by the abundance of dioxygenase-encoding genes using quantitative real-time PCR (qPCR). rdpA DNA was not detectable in unamended soil but reached over 106 copies g⻹ soil after amendment. sdpA and tfdA were both present prior to amendment at levels of ~5 × 104 and ~ 10² copies g⻹ soil, respectively, and both reached over 105copies g⻹ soil. While expression of all three target genes was detected during two cycles of herbicide degradation, a time-shift occurred between maximum expression of each gene. Gene diversity by denaturing gradient gel electrophoresis (DGGE) uncovered a diversity of sdpA and tfdA genes at the DNA level while rdpA remained highly conserved. However, mRNA profiles indicated that all transcribed tfdA sequences were class III genes while rdpA transcripts shared 100% identity to rdpA of Delftia acidovorans MC1 and sdpA transcripts shared 100% identity to sdpA from Sphingomonas herbicidovorans MH. This is the first report to describe expression dynamics of multiple α-KG dioxygenase-encoding genes in the indigenous microbial community as related to degradation of a phenoxypropionate herbicide in soil.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Solo
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Microbiologia do Solo
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Poluentes do Solo
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Dioxigenases
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Ácido 2,4-Diclorofenoxiacético
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Herbicidas
Idioma:
En
Revista:
Environ Microbiol
Assunto da revista:
MICROBIOLOGIA
/
SAUDE AMBIENTAL
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Dinamarca