1. Ecotoxicological Impact of the Bioherbicide Leptospermone on the Microbial Community of two Arable Soils
- Author
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Lise Barthelmebs, Sana Romdhane, Jean-François Cooper, Cédric Bertrand, Marion Devers-Lamrani, Franck E. Dayan, Christophe Calvayrac, Fabrice Martin-Laurent, Centre de recherches insulaires et observatoire de l'environnement (CRIOBE), Université de Perpignan Via Domitia (UPVD)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Agroécologie [Dijon], Institut National de la Recherche Agronomique (INRA)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Biocapteurs-Analyses-Environnement (BAE), Université de Perpignan Via Domitia (UPVD), Bioagricultural Sciences and Pest Management Department, Colorado State University [Fort Collins] (CSU), Université de Perpignan Via Domitia (UPVD)-École pratique des hautes études (EPHE)-Centre National de la Recherche Scientifique (CNRS), Centre de recherches insulaires et observatoire de l'environnement ( CRIOBE ), Université de Perpignan Via Domitia ( UPVD ) -École pratique des hautes études ( EPHE ) -Centre National de la Recherche Scientifique ( CNRS ), Institut National de la Recherche Agronomique ( INRA ) -Université de Bourgogne ( UB ) -AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, Biocapteurs-Analyses-Environnement ( BAE ), Université de Perpignan Via Domitia ( UPVD ), and Colorado State University [Fort Collins] ( CSU )
- Subjects
0301 basic medicine ,Microbiology (medical) ,lcsh:QR1-502 ,[ SDV.TOX.ECO ] Life Sciences [q-bio]/Toxicology/Ecotoxicology ,Leptospermone ,010501 environmental sciences ,01 natural sciences ,Microbiology ,complex mixtures ,bacterial community ,microbial ecotoxicology ,lcsh:Microbiology ,bioherbicide ,03 medical and health sciences ,chemistry.chemical_compound ,[ SDV.MP ] Life Sciences [q-bio]/Microbiology and Parasitology ,Original Research ,0105 earth and related environmental sciences ,2. Zero hunger ,Biotic component ,Ecology ,Community structure ,15. Life on land ,Micobial ecotoxicology ,[SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology ,030104 developmental biology ,chemistry ,Microbial population biology ,Environmental chemistry ,Soil water ,biodegradation ,leptospermone ,Biodegradation ,Pyrosequencing ,[SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology ,Microcosm ,Bioherbicide - Abstract
The ecotoxicological impact of leptospermone, a β-triketone bioherbicide, on the bacterial community of two arable soils was investigated. Soil microcosms were exposed or not (control, 0×) to leptospermone applied at 1× or 10× recommended dose. Leptospermone was moderately adsorbed to both soils (i.e.: Kfa 1.2 and Koc 140 ml.g-1). Dissipation of leptospermone was lower in sterilized than in unsterilized soils suggesting that it was mainly influenced by biotic factors. Within 45 days, leptospermone disappeared almost entirely from one of the two soils (i.e. DT50 < 10 days), while 25% of the leptospermone remained in the other. The composition of the microbial community assessed by qPCR targeting 11 microbial groups was found to be significantly modified in soil microcosms exposed to leptospermone. Pyrosequencing of 16S rRNA gene amplicons showed a shift in the bacterial community structure and a significant impact of leptospermone on the diversity of the soil bacterial community. Changes in the composition as well as in the α- and β-diversity of microbial community were transient in the soil able to fully dissipate the leptospermone. They were persistent in the soil where leptospermone remained. To conclude the bacterial community of the two soils was sensitive to leptospermone and its resilience was observed only when leptospermone was fully dissipated.
- Published
- 2016
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