Effect of earthworms on plant Lantana camara Pb-uptake and on bacterial communities in root-adhering soil
Jusselme, My Dung | Poly, Franck | Miambi, Edouard | Mora, Philippe | Blouin, Manuel | Pando, Anne | Rouland-Lefèvre, Corinne | Ecosystèmes, biodiversité, évolution [Rennes] (ECOBIO) ; Université de Rennes (UR)-Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS) ; Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) | Laboratoire d'Ecologie Microbienne - UMR 5557 (LEM) ; Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Ecole Nationale Vétérinaire de Lyon (ENVL)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Centre National de la Recherche Scientifique (CNRS) | Biogéochimie et écologie des milieux continentaux (Bioemco) ; École normale supérieure - Paris (ENS-PSL) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-AgroParisTech-Centre National de la Recherche Scientifique (CNRS) | Institut de Recherche pour le Developpement (IRD), France
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Показать больше [+] Меньше [-]Английский. The present study aimed to assess the potential abilities of Lantana camara, an invasive plant species for phytoremediation in the presence of earthworm Pontoscolex corethrurus. Effects of earthworm on growth and lead (Pb) uptake by L. camara plant were studied in soil artificially contaminated at 500 or 1000 mg of Pb kg− 1 soil. This species has a promising value for phytoremediation because it can uptake as much as 10% of 1000 mg kg− 1 of Pb per year. Moreover, the presence of earthworms enhanced plant biomass by about 1.5-2 times and increased the uptake of lead by about 2-3 times. In the presence of earthworm, L. camara was thus able to uptake up 20% of Pb presence in the soil, corresponding to remediation time of 5 years if all organs are removed. As soil microorganisms are known to mediate many interactions between earthworms and plants, we documented the effect of earthworms on the bacterial community of root-adhering soil of L. camara. Cultivable bacterial biomass of root-adhering soil increased in the presence of earthworms. Similar trend was observed on bacterial metabolic activities. The increase of lead concentrations from 500 to 1000 mg kg− 1 did not have any significant effect either on plant growth or on bacterial biomass and global activities but affected the structure and functional diversity of the bacterial community. These results showed that we should broaden the ecological context of phytoremediation by considering plant/microbial community/earthworm interactions that influence the absorption of heavy metals.
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