Biodegradation of oxadiazon by a soil isolated Pseudomonas fluorescens strain CG5: Implementation in an herbicide removal reactor and modelling

Garbi, Carlos; Casasús, Luis; Martínez‐Álvarez, Roberto; Robla, J. I.; Martín, Margarita

doi:10.1016/j.watres.2006.01.010

Cited by 22 publications

(15 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to its high specific surface area and the diversity of functional groups, the OM can interact with the organic molecules of different shapes. The possible mechanisms involved in the interaction among herbicides of low water solubility, such as oxadiazon (Garbi et al, 2006), with 0.57 mg L -1 (Footprint, 2013), and the OM are hydrogen bonding, Van der Waals forces, hydrophobic interactions and charge transfer, and they can operate concurrently in the sorption of the same molecule (Sheng et al, 2001). The molecular ** p < 0.01 by the F test.…”

Section: Resultsmentioning

confidence: 99%

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

et al. 2014

View full text Add to dashboard Cite

-The objective of this study was to evaluate oxadiazon sorption in different soils of the Brazilian Cerrado, highlighting the correlations of lethal doses of this herbicide capable of inhibiting 50% of the dry matter accumulation of the bio-indicator (LD50) among the chemical characteristics of the soil and its direct and indirect effects. The experiment was carried out in a greenhouse in a randomized block design and four repetitions. Each experimental unit consisted of a pot with increasing rates of oxadiazon and oat (Avena sativa), as the bio-indicator species. For sorption evaluation, washed sand and 22 soils (substrates) from Cerrado Brazilian's Alliaceae cultivated areas were used. LD50 and sorption ratio (SR) = [(LD50soil -LD50sand)/ LD50sand] to the substrates were determined. Pearson correlation analysis was performed between the chemical characteristics of the substrates and the LD50 of oxadiazon. A path analysis was quantified, to deploy only the significant correlations estimated in direct and indirect effects of the characters on LD50, which is a basic variable. A more pronounced LD50 (528.09 g ha -1 ) for the Cerrado soil sample resulted in higher SR (> 53.00), while in the washed sand substrate, LD50 corresponded only to 9.74 g ha -1 of the oxadiazon (available in soil). It was concluded that oxadiazon sorption is influenced by the chemical characteristics of the soils, highlighting the correlation with pH (CaCl 2 ), magnesium content, aluminum, organic matter, organic carbon, and aluminum saturation.Keywords: bioassay, neutral herbicide, organic matter. RESUMO -Objetivou-se neste estudo avaliar a sorção do oxadiazon em diferentes solos do Cerrado Brasileiro, destacando as correlações da dose letal do herbicida capaz de inibir 50% do acúmulo da massa seca do bioindicador (DL50) entre as características químicas do solo e seus efeitos diretos e indiretos. O experimento foi realizado em casa de vegetação, com delineamento em blocos casualizados com quatro repetições. Cada unidade experimental foi constituída de um vaso com doses crescentes do oxadiazon; utilizou-se a aveia (Avena

show abstract

Section: Resultsmentioning

confidence: 99%

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Based on the morphological and biochemical characterization of the isolates, we identified the cultures as belonging to the versatile bacterial genus Pseudomonas. Previous reports have suggested that this genus can degrade a number of chemicals and pesticides, including oxadiazon (Garbi et al, 2006), sulfonylurea (Ma et al, 2009), p-nitrophenol (Zheng et al, 2009) and phenolic compounds (Li et al, 2010). Thus, this genus has immense nutritional diversity.…”

Section: Discussionmentioning

confidence: 99%

Diversity of propanil-degrading bacteria isolated from rice rhizosphere and their potential for plant growth promotion

Procópio¹,

Procopio²,

Pizzirani-Kleiner³

et al. 2012

Genet. Mol. Res.

View full text Add to dashboard Cite

ABSTRACT. The herbicide propanil has long been used in rice production in southern Brazil. Bacteria isolated from contaminated soils in Massaranduba, Santa Catarina, Brazil, were found to be able to grow in the presence of propanil, using this compound as a carbon source. Thirty strains were identified as Pseudomonas (86.7%), Serratia (10.0%), and Acinetobacter (3.3%), based on phylogenetic analysis of 16S rDNA. Little genetic diversity was found within species, more than 95% homology, suggesting that there is selective pressure to metabolize propanil in the microbial community. Two strains of Pseudomonas (AF7 and AF1) were selected in bioreactor containing chemotactic growth medium, with the highest degradation activity of propanil exhibited by strain AF7, followed by AF1 (60 and 40%, respectively). These strains when encapsulated in alginate exhibited a high survival rate and were able to colonize the rice root surfaces. Inoculation with Pseudomonas strains AF7 and AF1 significantly improved the plant height of rice. Most of the Pseudomonas strains produced indoleacetic acid, soluble mineral phosphate, and fixed nitrogen. These bacterial strains could potentially be used for the bioremediation of propanil-contaminated soils and the promotion of plant growth.

show abstract

“…In this case, Pseudomonas spp. were tested in other research and showed good results in the degradation of simazine (Garbi et al, 2006;Martin et al, 2008;Martin-Montalvo et al, 1997). Differing from other studies, the present research does not use pure cultures or sterile conditions, but mixed cultures under real surrounding conditions, which represents a unique contribution to the support use.…”

Section: Methodsmentioning

confidence: 98%

“…Sepiolite has been used as a support medium for microbial adherence in different wastewater treatments in Spain, with good results (Arnaiz et al, 2006;Diez et al, 1995;Martin et al, 2008). For example, immobilized microorganisms are used for the decontamination of wastewater in treatment plants of fixed biofilm, with systems such as trickling filters, rotating biological contactors, or fluidized beds (Costerton et al, 1995;Garbi et al, 2006;Nicolella et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Biological Degradation of Simazine by Mixed‐Microbial Cultures Immobilized on Sepiolite and Tepojal Beads

Castro-González

Prieto-Jiménez

Domínguez-Vélez

et al. 2011

Water Environment Research

View full text Add to dashboard Cite

Simazine degradation by mixed microbial cultures was carried out in biological reactors with tepojal and sepiolite beads. The inoculum used is derived from a biotechnological product applied to plant roots, which contains mixed microbial cultures. This inoculum presented a stable adherence to the microorganism support throughout the experiment. In this research, the supports were evaluated in relation to both biofilm formation and simazine removal. For this study, hydraulic and mass starting-up parameters were established for simazine degradation and for the use of these reactors in the two types of supports. Tepojal had never been used before as a microbial support in any previous research paper. Tepojal demonstrated to be more efficient than sepiolite. Statistical analysis was done for the relationship among the parameters of chemical oxygen demand, colony formation units, total suspended solids, and volatile suspended solids. Water Environ. Res., 83, 274 (2011).

show abstract

Biodegradation of oxadiazon by a soil isolated Pseudomonas fluorescens strain CG5: Implementation in an herbicide removal reactor and modelling

Cited by 22 publications

References 13 publications

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

Sorption of oxadiazon in soils cultivated in the brazilian cerrado

Diversity of propanil-degrading bacteria isolated from rice rhizosphere and their potential for plant growth promotion

Biological Degradation of Simazine by Mixed‐Microbial Cultures Immobilized on Sepiolite and Tepojal Beads

Contact Info

Product

Resources

About