title: Assessing the dynamic changes of rhizosphere functionality of Zea mays plants grown in organochlorine contaminated soils.
abstract: The persistent organochlorine pesticides (OCPs) in soils are suspected to disturb soil biogeochemical cycles. This study addressed the dynamic changes in soil functionality under lindane and chlordecone exposures with or without maize plant. Decreases in soil ammonium concentration, potential nitrogen mineralization and microbial biomass were only OCP-influenced in bulk soils. OCPs appeared to inhibit the ammonification step. With plants, soil functionality under OCP stress was similar to controls demonstrating the plant influence to ensure the efficiency of C- and N-turnover in soils. Moreover, OCPs did not impact the microbial community physiological profile in all tested conditions. However, microbial community structure was OCP-modified only in the presence of plants. Abundances of gram-negative and saprophytic fungi increased (up to +93% and +55%, respectively) suggesting a plant stimulation of nutrient turnover and rhizodegradation processes. Nevertheless, intimate microbial/plant interactions appeared to be OCP-impacted with depletions in mycorrhizae and micro/meso-fauna abundances (up to -53% and -56%, respectively) which might have adverse effects on more long-term plant growth (3-4 months). In short-term experiment (28days), maize growth was similar to the control ones, indicating an enhanced plasticity of the soil functioning in the presence of plants, which could efficiently participate to the remediation of OCP-contaminated soils.
authors.affiliation: Laboratoire d'Ecologie Alpine, UMR CNRS-UGA-USMB 5553, Univ. Grenoble Alpes, CS 40700, 38058 Grenoble Cedex, France.
authors.forename: Claire
authors.initials: C
authors.lastname: Blondel
authors.affiliation: Laboratoire d'Ecologie Alpine, UMR CNRS-UGA-USMB 5553, Univ. Grenoble Alpes, CS 40700, 38058 Grenoble Cedex, France.
authors.forename: Loïc
authors.initials: L
authors.lastname: Briset
authors.affiliation: Laboratoire d'Ecologie Alpine, UMR CNRS-UGA-USMB 5553, Univ. Grenoble Alpes, CS 40700, 38058 Grenoble Cedex, France; Ecole de la Nature et du Paysage, INSA Centre Val de Loire, 9 Rue Chocolaterie, 41000 Blois, France; CNRS, CITERES, UMR 7324, 37200 Tours, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Legay
authors.affiliation: Laboratoire d'Ecologie Alpine, UMR CNRS-UGA-USMB 5553, Univ. Grenoble Alpes, CS 40700, 38058 Grenoble Cedex, France.
authors.forename: Cindy
authors.initials: C
authors.lastname: Arnoldi
authors.affiliation: UMR CNRS 5557 Ecologie Microbienne, Université Claude Bernard Lyon 1, 69622 Villeurbanne Cedex, France.
authors.forename: Franck
authors.initials: F
authors.lastname: Poly
authors.affiliation: Laboratoire d'Ecologie Alpine, UMR CNRS-UGA-USMB 5553, Univ. Grenoble Alpes, CS 40700, 38058 Grenoble Cedex, France; CARRTEL,UMR 0042 INRA - Univ. Savoie Mont Blanc, FR-73376, Le Bourget du Lac, France.
authors.forename: Jean-Christophe
authors.initials: JC
authors.lastname: Clément
authors.affiliation: Laboratoire d'Ecologie Alpine, UMR CNRS-UGA-USMB 5553, Univ. Grenoble Alpes, CS 40700, 38058 Grenoble Cedex, France. Electronic address: muriel.raveton@univ-grenoble-alpes.fr.
authors.forename: Muriel
authors.initials: M
authors.lastname: Raveton
mesh_terms: D018533:Biomass; D002244:Carbon / Q000032:analysis; D007631:Chlordecone / Q000633:toxicity*; D001556:Hexachlorocyclohexane / Q000633:toxicity*; D009584:Nitrogen / Q000032:analysis; D018517:Plant Roots / Q000187:drug effects*; D012987:Soil / Q000737:chemistry; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000633:toxicity*; D003313:Zea mays
chemical_list: D012987:Soil; D012989:Soil Pollutants; D001556:Hexachlorocyclohexane; D002244:Carbon; D009584:Nitrogen; D007631:Chlordecone
keywords: Biogeochemical cycles; Maize; Microbial communities; Organochlorines; Rhizosphere