Bioremediation of lindane-contaminated soil by Streptomyces sp. M7 and its effects on Zea mays growth

Benimeli, Claudia Susana; Fuentes, Mauricio; Abate, Carlos Mauricio; Amoroso, Maria Julia del R.

doi:10.1016/j.ibiod.2007.09.001

Cited by 104 publications

(43 citation statements)

References 41 publications

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“…It seems that MTX provides an additional source of carbon to support the cells growth, besides to own soil organic matter. Similar results were obtained by Benimeli et al (2008), who found that Streptomyces spp. M7 continued growing after consuming lindane, possibly using the organic nutrients readily available in soil.…”

Section: Resultssupporting

confidence: 89%

“…Before being inoculated on soil, selected mixed culture was precultured on TSB as described above. Pots with MTX were inoculated with precultured strains using a microbial concentration of 2 g kg -1 of soil (designed as ''assay'') (Benimeli et al 2008). Soil, inoculum, and MTX were mixed thoroughly to ensure a uniform distribution.…”

Section: Soil Assay: Conditions and Inoculationmentioning

confidence: 99%

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Methoxychlor bioremediation by defined consortium of environmental Streptomyces strains

Fuentes

Álvarez

Sáez

et al. 2013

Int. J. Environ. Sci. Technol.

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Methoxychlor is an organochlorine pesticide used worldwide against several insect pests, resulting in human exposure. This pesticide mimics endocrine hormone functions, interfering with normal endocrine activity in humans and wildlife. For this reason, it is imperative to develop methods to remove this pesticide from the environment, and though, bioremediation using microorganisms results as an excellent strategy. Five Streptomyces spp. strains previously isolated from organochlorine-polluted sites and capable to grow and remove methoxychlor were combined as different mixed cultures to increase methoxychlor removal. From the 39 consortia tested, one consortium (Streptomyces spp. A6, A12, A14, M7) was selected because of its high pesticide removal and specific dechlorinase activity to be assayed on slurry and soil systems. This consortium showed higher biomass values (8.3 9 10 6 ± 5.7 9 10 5 CFU mL -1 ) and methoxychlor removal (56.2 ± 2.3 %) on enriched slurry than in nonenriched slurry (7.3 9 10 5 ± 1.2 9 10 5 CFU mL -1 and 45.6 ± 7.4 % of pesticide removal). In soil systems, Streptomyces consortium showed higher growth (1.0 9 10 11 ± 5.0 9 10 10 CFU g -1 ) than in enriched slurry, although differences in methoxychlor removal between both culture conditions were not statistically significant. Therefore, the selected Streptomyces consortium may be suitable for the development of in situ (soil) and ex situ (slurry bioreactor) bioremediation methods because of their potential to remove methoxychlor from different systems.

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Section: Resultssupporting

confidence: 89%

Section: Soil Assay: Conditions and Inoculationmentioning

confidence: 99%

Methoxychlor bioremediation by defined consortium of environmental Streptomyces strains

Fuentes

Álvarez

Sáez

et al. 2013

Int. J. Environ. Sci. Technol.

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“…Sphingobium japonicum UT26 (Nagata et al 2006), Pseudomonas aeruginosa ITRC-5 (Kumar et al 2006), Streptomyces sp. M7 (Benimeli et al 2008), Sphingobium ummariense sp. (Singh and Lal 2009), Stenotrophomonas sp.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of γ-hexachlorocyclohexane biodegradation by a nitrogen-fixing cyanobacterium, Anabaena azotica

Zhang

Jia

et al. 2011

J Appl Phycol

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Biodegradation of γ-hexachlorocyclohexane (lindane) by a nitrogen-fixing cyanobacterium isolated from Chinese paddy soils, Anabaena azotica 118, was investigated. Lindane with an initial concentration of 0.2 mg L −1 in the cultures had no negative effect on the chlorophyll a concentration of A. azotica after 5 d exposure. The tolerance of this cyanobacterium to lindane indicates that it has the potential to biodegrade lindane. The degradation experiments show that the percentage of lindane removal efficiency by A. azotica was 48.8% after 5 d, at an initial lindane concentration of 0.2 mg L −1 and initial A. azotica chlorophyll a concentration of 50 mg L −1 . The calculated half-life was 4.78 d. Elevated culture temperature, irradiation, and usage of nitrate as the nitrogen source in the cultures could increase the biodegradation efficiency of lindane. γ-Pentachlorocyclohexene was detected as a metabolite of lindane. The ability of A. azotica to biodegrade lindane has potential use in the bioremediation for this organochlorine pesticide.

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“…Given autochthonous microorganisms were not capable of molinate degradation, a fact that may explain previous studies reporting the herbicide detection in natural water streams receiving rice field tail waters (Castro et al 2005;Claver et al 2006;Kuivila and Jennings 2007;Sudo et al 2005), we decided to test a bioaugmentation approach to remediate the floodwaters. The feasibility of environmental pesticide removal through bioaugmentation processes has been addressed in several studies (Benimeli et al 2008;Hong et al 2007;Lima et al 2009;Silva et al 2004a). One of the most important factors for a successful implementation of a bioaugmentation process is the availability of an efficient degrading culture.…”

Section: Introductionmentioning

confidence: 99%

Bacterial diversity and bioaugmentation in floodwater of a paddy field in the presence of the herbicide molinate

2010

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This work aimed at studying variations on the diversity and composition of the bacterial community of a rice paddy field floodwater, subjected to conventional management, namely by using the herbicide molinate. The promotion of the herbicide biodegradation either by the autochthonous microbiota or by a bioaugmentation process was also assessed. This study comprehended four sampling campaigns at key dates of the farming procedures (seeding, immediately and 6 days after application of the herbicide molinate, and after synthetic fertilization) and the subsequent physic-chemical and microbiological characterization (pH, DOC and molinate contents, total cells, cultivable bacteria and DGGE profiling) of the samples. Multivariate analysis of the DGGE profiles showed temporal variations in the bacterial community structure and the Shannon's index values indicated that the bacterial diversity reached its minimum at the molinate application day. The highest bacterial diversity coincided with the periods with undetectable concentrations of the herbicide, although microcosm assays suggested that other factors than molinate may have been responsible for the decrease of the bacterial diversity. The ability of autochthonous microorganisms to degrade molinate and the influence of the herbicide on the bacterial community composition were assessed in microcosm assays using floodwater collected at the same dates. Given molinate was not degraded by autochthonous microorganisms, and considering it represents an environmental contaminant, bioaugmentation microcosms were assayed aiming the assessment of the feasibility of a bioremediation process to clean contaminated floodwater. A molinate-mineralizing culture, previously isolated, promoted molinate removal, induced alterations in the autochthonous bacterial community structure and diversity, and was undetected after 7 days of incubation, suggesting the feasibility of the process.

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Bioremediation of lindane-contaminated soil by Streptomyces sp. M7 and its effects on Zea mays growth

Cited by 104 publications

References 41 publications

Methoxychlor bioremediation by defined consortium of environmental Streptomyces strains

Methoxychlor bioremediation by defined consortium of environmental Streptomyces strains

Characteristics of γ-hexachlorocyclohexane biodegradation by a nitrogen-fixing cyanobacterium, Anabaena azotica

Bacterial diversity and bioaugmentation in floodwater of a paddy field in the presence of the herbicide molinate

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