| Title | Effects of DDE on a soil natural microbial community in presence/absence of the Solanum lycopersicum plant |
| Abstract | Although the use of DDTs has been banned in most Countries over 20 years ago, its residues (DTTr) still persist in the environment. DDE (1,1-dichloro-2,2-bis(4- chlorophenyl)ethylene) is the most toxic DDT metabolite and it is reported to be more persistent than its parental compound (Ortìz and Velasco, 2013). Plant-assisted bioremediation can be a promising and cost-effective clean-up technology to contaminated soil remediation. It relies on synergistic action between plant rhizosphere where microorganisms support toxic substance removal. Solanum lycopersicum is known to be able to accumulate DDTs in roots, owing to exudate production, which make these contaminants more bioavailable for soil microorganisms. Moreover, several natural bacterial strains have been shown to degrade organochlorine pesticide through their enzymes able to break-down complex molecules (Verma et al., 2014; Qu et al., 2015). In this context, a greenhouse experiment was performed to study the effects of tomato plant presence on DDE persistence in an agricultural soil. The experimental set up consisted of pots filled with contaminated soil (1ppm of DDE) in presence/absence of tomato plants and control soils (with/without plant and/or DDE). The plots were sampled 40 days from DDE exposure. The effects of DDE and/or plant presence on the natural microbial community were evaluated in terms of microbial abundance, viability, structure, dehydrogenase activity and DDE residual concentration. The overall results showed that although the plant presence stimulated the soil microbial community activity, it did not increase DDE degradation. On the other hand DDE presence not only did not negatively affect the natural microbial community, but the latter was able to degrade DDE independently from the plant presence, showing a preacquired capability presumably due to a soil previous contact with this pesticide. |
| Source | Soil biodiversity and European woody agroecosystems, Granada (Spain), 14-15 Marzo 2018 |
| Keywords | plant-assisted bioremediationpesticidemicrobial community structuregreenhouse experimentsoil microbial activity |
| Year | 2018 |
| Type | Abstract in atti di convegno |
| Authors | Dejana L, Di Lenola M, Cardoni M, Grenni P, Mitton FM, Patrolecco L, Ademollo N, Gonzales M, Miglioranza KSB, Barra Caracciolo A |
| Text | 389440 2018 plant assisted bioremediation pesticide microbial community structure greenhouse experiment soil microbial activity Effects of DDE on a soil natural microbial community in presence/absence of the Solanum lycopersicum plant Dejana L, Di Lenola M, Cardoni M, Grenni P, Mitton FM, Patrolecco L, Ademollo N, Gonzales M, Miglioranza KSB, Barra Caracciolo A Dejana L, Di Lenola M, Cardoni M, Grenni P, Patrolecco L, Ademollo N, Barra Caracciolo A IRSA CNR Mitton FM, Gonzales M, Miglioranza KSB 2Laboratorio de Ecotoxicologia y Contaminacion Ambiental, Facultad de Ciencias Exactas y Naturales, Universitad Nacional de Mar del Plata, Mar del Plata, Argentina Soil biodiversity and European woody agroecosystems. COST Action FP1305 BioLink Linking belowground biodiversity and ecosystem function in European forests. Proceedings of the 2018 Annual Meeting Granada Grenni P, Fernandez Lopez M, Mercado Blanco J 978 88 97655 03 9 Published version http //www.irsa.cnr.it/index.php/ita/news/item/232 soil biodiversity and european woody agroecosystems Soil biodiversity and European woody agroecosystems Granada Spain 14 15 Marzo 2018 Internazionale Contributo Although the use of DDTs has been banned in most Countries over 20 years ago, its residues DTTr still persist in the environment. DDE 1,1 dichloro 2,2 bis 4 chlorophenyl ethylene is the most toxic DDT metabolite and it is reported to be more persistent than its parental compound Ortiz and Velasco, 2013 . Plant assisted bioremediation can be a promising and cost effective clean up technology to contaminated soil remediation. It relies on synergistic action between plant rhizosphere where microorganisms support toxic substance removal. Solanum lycopersicum is known to be able to accumulate DDTs in roots, owing to exudate production, which make these contaminants more bioavailable for soil microorganisms. Moreover, several natural bacterial strains have been shown to degrade organochlorine pesticide through their enzymes able to break down complex molecules Verma et al., 2014; Qu et al., 2015 . In this context, a greenhouse experiment was performed to study the effects of tomato plant presence on DDE persistence in an agricultural soil. The experimental set up consisted of pots filled with contaminated soil 1ppm of DDE in presence/absence of tomato plants and control soils with/without plant and/or DDE . The plots were sampled 40 days from DDE exposure. The effects of DDE and/or plant presence on the natural microbial community were evaluated in terms of microbial abundance, viability, structure, dehydrogenase activity and DDE residual concentration. The overall results showed that although the plant presence stimulated the soil microbial community activity, it did not increase DDE degradation. On the other hand DDE presence not only did not negatively affect the natural microbial community, but the latter was able to degrade DDE independently from the plant presence, showing a preacquired capability presumably due to a soil previous contact with this pesticide. Abstract Book AbstractBook_Biolink_Granada_2018.pdf Abstract in atti di convegno CARDONI MARTINA DI LENOLA MARTINA DEJANA LAURA luisa.patrolecco PATROLECCO LUISA anna.barracaracciolo BARRA CARACCIOLO ANNA paola.grenni GRENNI PAOLA nicoletta.ademollo ADEMOLLO NICOLETTA TA.P04.005.011 Vulnerabilita degli ecosistemi delle acque sotterranee e attenuazione naturale degli inquinanti nel suolo e nel sottosuolo |
