Estimation of atrazine-degrading genetic potential and activity in three French agricultural soils.
The impact of organic amendment (sewage sludge or waste water) used to fertilize agricultural soils was estimated on the atrazine-degrading activity, the atrazine-degrading genetic potential and the bacterial community structure of soils continuously cropped with corn. Long-term application of organic amendment did not modify atrazine-mineralizing activity, which was found to essentially depend on the soil type. It also did not modify atrazine-degrading genetic potential estimated by quantitative PCR targeting atzA, B and C genes, which was shown to depend on soil type. The structure of soil bacterial community determined by RISA fingerprinting was significantly affected by organic amendment. These results showed that modification of the structure of soil bacterial community in response to organic amendment is not necessarily accompanied by a modification of atrazine-degrading genetic potential or activity. In addition, these results revealed that different soils showing similar atrazine-degrading genetic potentials may exhibit different atrazine-degrading activities.
Martin-Laurent
Fabrice
F
INRA-CMSE, UMR INRA-Université de Bourgogne, Dijon, France. fmartin@dijon.inra.fr
Cornet
Laurent
L
Ranjard
Lionel
L
López-Gutiérrez
Juan-Carlos
JC
Philippot
Laurent
L
Schwartz
Christophe
C
Chaussod
Rémi
R
Catroux
Gérard
G
Soulas
Guy
G
D001280:Atrazine / Q000378:metabolism*; D001419:Bacteria / Q000235:genetics* / Q000378:metabolism*; D001426:Bacterial Proteins / Q000235:genetics; D044822:Biodiversity; D001711:Biotransformation; D016172:DNA Fingerprinting / Q000379:methods; D004269:DNA, Bacterial / Q000235:genetics; D005602:France; D016133:Polymerase Chain Reaction / Q000379:methods; D012988:Soil Microbiology; D003313:Zea mays / Q000254:growth & development
D001426:Bacterial Proteins; D004269:DNA, Bacterial; D001280:Atrazine