Crotalaria juncea L. enhances the bioremediation of sulfentrazone-contaminated soil and promotes changes in the soil bacterial community.

Autor: de Souza AJ; Luiz de Queiroz College of Agriculture, University of São Paulo, Piracicaba, São Paulo, Brazil. adijailtonsouza@alumni.usp.br., Santos E; Federal University of Espírito Santo, Sao Mateus, Espírito Santo, Brazil., Ribeiro FP; Federal University of Espírito Santo, Sao Mateus, Espírito Santo, Brazil., de Araújo Pereira AP; Federal University of Ceará, Fortaleza, Ceará, Brazil., Viana DG; Luiz de Queiroz College of Agriculture, University of São Paulo, Piracicaba, São Paulo, Brazil., da Silva Coelho I; Federal Rural University of Rio de Janeiro, Rio de Janeiro, Brazil., Filho FBE; Federal University of Minas Gerais, Belo Horizonte, Brazil., Santaren KCF; Federal Rural University of Rio de Janeiro, Rio de Janeiro, Brazil.
Jazyk: angličtina
Zdroj: Brazilian journal of microbiology : [publication of the Brazilian Society for Microbiology] [Braz J Microbiol] 2023 Sep; Vol. 54 (3), pp. 2319-2331. Date of Electronic Publication: 2023 Aug 14.
DOI: 10.1007/s42770-023-01064-5
Abstrakt: Sulfentrazone (STZ) is an efficient tool for the pre- and post-emergence control of monocotyledonous and dicotyledonous weeds in fields of crops such as pineapple, coffee, sugarcane, citrus, eucalyptus, tobacco, and soybean. However, this herbicide persists in the soil, causing phytotoxicity in the subsequent crop. Therefore, it is important to use efficient strategies for the remediation of STZ-contaminated areas. The aim of this study was to evaluate the effects of Crotalaria juncea L. on the remediation of STZ-contaminated soil and on the microbial activity and bacterial community structure therein. The study was conducted in three stages: (i) cultivation of C. juncea in soil contaminated with 200, 400, and 800 g ha -1 STZ; (ii) determination of the soil microbial activity (basal respiration, microbial biomass carbon, and bacterial community structure); and (iii) cultivation of a bioindicator species and determination of the residual fraction of STZ. The soil microbial activity was impacted by the soil type and STZ dose. Soil previously cultivated with C. juncea (rhizospheric soil) displayed higher CO 2 and lower qCO 2 values than non-rhizospheric soil (no previous C. juncea cultivation). Increasing doses of STZ reduced the activity and lowered the diversity indices of the soil microorganisms. The bacterial community structure was segregated between the rhizospheric and non-rhizospheric soils. Regardless of soil type, the bioindicator of remediation (Pennisetum glaucum R.Br.) grew only at the STZ dose of 200 g ha -1 , and the plant intoxication level was also lower in rhizospheric soil treated with this herbicide dose. All P. glaucum plants died in the soils treated with 400 and 800 g ha -1 STZ. Previous cultivation of C. juncea in soils contaminated with 200, 400, and 800 g ha -1 STZ reduced the residual fraction of the herbicide by 4.8%, 12.5%, and 17.4%, respectively, compared with that in the non-rhizospheric soils. In conclusion, previous cultivation with C. juncea promoted increases in the soil bacterial activity and diversity indices, mitigated the deleterious effects of STZ on the bioindicator crop, and reduced the residual fraction of the herbicide in the soil.
(© 2023. The Author(s) under exclusive licence to Sociedade Brasileira de Microbiologia.)
Databáze: MEDLINE
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