| Title | THE ROLE OF BACTERIAL COMMUNITY OF AN AGROECOSYSTEM IN SIMAZINE DEGRADATION |
| Abstract | The use of pesticides and fertilizers in agricultural practice is the main source of soil and groundwater contamination. S-Triazines are among the herbicides most used in the world for selective weed control in several types of crops. The homeostatic capability of an agroecosystem to remove a triazinic herbicide, simazine, was assessed in microcosms treated with the herbicide in presence/absence of urea fertilizer. The latter, as well as a fertilizer, is also one of the last by-products before simazine mineralization. The biodegradation, in terms of disappearance of 50% of the initial concentration (DT50), was compared to the degradation and metabolite formation occurring in sterilized soil. Moreover, the bacterial community response was assessed in terms of abundance and community structure by the epifluorescence direct count method and fluorescence in situ hybridization, respectively. The results show that the microbial community has a primary role in simazine degradation and that this process is due to the presence of a microbial pool working in succession and of which the metabolism may be modulated by exogenous sources of nitrogen, like urea. The latter influences the degradative pathway with a greater formation and accumulation of the desethyl simazine metabolite, which is a hazardous contaminant of soil and groundwater ecosystems, as well as its parent compound. |
| Source | Italian journal of agronomy (Testo stamp.) 2 (2), pp. 163–169 |
| Keywords | simazinedesethyl-simazinebacterial communitydegradation and microbial degradation |
| Journal | Italian journal of agronomy (Testo stamp.) |
| Editor | PagePress Publications,, Udine, Italia |
| Year | 2007 |
| Type | Articolo in rivista |
| DOI | 10.4081/ija.2007.163 |
| Authors | Barra Caracciolo A, Grenni P Saccà ML, Di Landa G, Ciccoli R |
| Text | 67728 2007 10.4081/ija.2007.163 simazine desethyl simazine bacterial community degradation and microbial degradation THE ROLE OF BACTERIAL COMMUNITY OF AN AGROECOSYSTEM IN SIMAZINE DEGRADATION Barra Caracciolo A, Grenni P Sacca ML, Di Landa G, Ciccoli R BARRA CARACCIOLO A, GRENNI P, SACCÁ L Water Research Institute, National Research Council DI LANDA G, CICCOLI R ENEA Italian National Agency for New Technologies, Energy and Environment, Rome, Italy The use of pesticides and fertilizers in agricultural practice is the main source of soil and groundwater contamination. S Triazines are among the herbicides most used in the world for selective weed control in several types of crops. The homeostatic capability of an agroecosystem to remove a triazinic herbicide, simazine, was assessed in microcosms treated with the herbicide in presence/absence of urea fertilizer. The latter, as well as a fertilizer, is also one of the last by products before simazine mineralization. The biodegradation, in terms of disappearance of 50% of the initial concentration DT50 , was compared to the degradation and metabolite formation occurring in sterilized soil. Moreover, the bacterial community response was assessed in terms of abundance and community structure by the epifluorescence direct count method and fluorescence in situ hybridization, respectively. The results show that the microbial community has a primary role in simazine degradation and that this process is due to the presence of a microbial pool working in succession and of which the metabolism may be modulated by exogenous sources of nitrogen, like urea. The latter influences the degradative pathway with a greater formation and accumulation of the desethyl simazine metabolite, which is a hazardous contaminant of soil and groundwater ecosystems, as well as its parent compound. 2 Published version http //www.agronomy.it/index.php/agro/article/view/ija.2007.163 Articolo pubblicato ArticoloPubblicato.pdf Articolo in rivista PagePress Publications, 1125 4718 Italian journal of agronomy Testo stamp. Italian journal of agronomy Testo stamp. Ital. j. agron. Testo stamp. Italian journal of agronomy Testo stamp. Italian journal of agronomy. Rivista di agronomia Testo stamp. paola.grenni GRENNI PAOLA anna.barracaracciolo BARRA CARACCIOLO ANNA TA.P04.005.007 Strumenti di mitigazione dello stress quali quantitativo per i sistemi idrici |
