Metal-tolerant bacteria occurring in heavily polluted soil and mine spoil

Piotrowska‐Seget, Zofia; Cycoń, Mariusz; Kozdrój, Jacek

doi:10.1016/j.apsoil.2004.08.001

Cited by 174 publications

(124 citation statements)

References 35 publications

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“…Rau et al (2009) mentioned that the dominance of bacilli cell shape provides ecological advantage to maximize the nutrient uptake and the dominance of both gramnegative and gram-positive rhizobacteria has been reported at metal contaminated sites by Frostegård et al (1993) and Abaye et al (2005). Even metals exert their toxic effects on microorganisms through various mechanisms; the metal-tolerant bacteria could survive in these habitats and could be isolated and selected for their potential application in the bioremediation of contaminated sites (Piotrowska-Seget et al, 2005;Ma et al, 2009).…”

Section: Characterization Of the Siderophores Producersmentioning

confidence: 99%

Comparative plant growth promoting traits and distribution of rhizobacteria associated with heavy metals in contaminated soils

Melo

Flores

Murrieta

et al. 2011

Int. J. Environ. Sci. Technol.

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ABSTRACT:The heavy metals at high concentration are generally toxic to the plants for their metabolism and growth; therefore, interactions among metals, rhizosphere microbes and plants have attracted attention because of the biotechnological potential of microorganisms for metal removal directly from contaminated soils or the possible transference of them to the plants. The aim of this study was to compare the relationships between the physiological in vitro characteristics of rhizobacteria isolated from plant metal accumulators and their distribution relating with the heavy metals content in contaminated soils. The results of this study showed that the heavy metals present in the rhizosphere of the plant species analyzed, decrease the microbial biomass and content of heavy metals caused a different distribution of rhizobacteria found. Gram negative rhizobacteria (90 %) and gram positive rhizobacteria (10 %) were isolated; all of them are metal-resistant rhizobacteria and 50 % of the isolated rhizobacteria possess both traits: higher indol acetic acid and siderophore producers. The inoculation with these rhizosphere microorganisms that possess metal-tolerating ability and plant growth promoting activities, can be recommended with a practical importance for both metal-contaminated environment and plant growth promotion.

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Section: Characterization Of the Siderophores Producersmentioning

confidence: 99%

Comparative plant growth promoting traits and distribution of rhizobacteria associated with heavy metals in contaminated soils

Melo

Flores

Murrieta

et al. 2011

Int. J. Environ. Sci. Technol.

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“…In the soil surrounding the large I-214 poplar plants, Flavobacterium was the prevalent genus. Flavobacteria are found in the soil and rhizosphere where they tolerate high levels of major pollutants, including HMs (Kuffner et al 2008, Piotrowska-Seget et al 2005, and promote plant growth under natural and stressful conditions (He et al 2010, Kuffner et al 2008). Both culture-independent methods for the whole bacterial community and DGGE analysis of the culturable fraction revealed a larger biodiversity in the poplar-associated soil samples as compared to the bulk soil, strongly suggesting that poplar trees select and increment the rhizosphereassociated microflora, possibly through the release of root exudates.…”

Section: Survey Of Soil Microbial Populations Associated To Poplar Inmentioning

confidence: 99%

Arbuscular mycorrhizal fungi as a tool to ameliorate the phytoremediation potential of poplar: biochemical and molecular aspects

Cicatelli¹,

Torrigiani²,

Todeschini³

et al. 2014

iForest

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© iForest -Biogeosciences and Forestry IntroductionMany large areas around the world are contaminated with heavy metals (HMs) and/or organic compounds; most of these have not been remediated due to the high cost and technical drawbacks of currently available technologies. HMs tend to accumulate in soils and aquatic sediments and can enter the food chain leading to the biomagnification phenomenon thereby representing a risk to the environment and to human health (Clijsters et al. 1999). Some essential elements, such as copper (Cu) and zinc (Zn), may be present in soils and waters at potentially toxic levels mainly as a result of agricultural and industrial practices (Ali et al. 2004).Alternative techniques for the clean-up of polluted soil and water, such as the cost-effective and less disruptive phytoremediation, have gained acceptance in recent years (Pilon-Smits 2005, Thewys et al. 2010. Trees have been suggested as suitable for phytoremediation due to their high biomass production (Dickinson & Pulford 2005) and because tree plantations can be multi-purpose (Tognetti et al. 2013). Poplar has many characteristics suitable for phytoremediation: a fast rate of growth, a deep and wide-spreading root system and a metal-resistance trait (Aronsson & Perttu 2001, Di Baccio et al. 2011, Punshon & Dickinson 1997, Sebastiani et al. 2004). In Italy, P. alba (white poplar) and P. nigra (black poplar) populations of the Ticino river valley constitute a hotspot of biodiversity (Castiglione et al. 2009, Fossati et al. 2004. Their genetic variability is being exploited for the selection of genotypes having interesting traits, such as tolerance to pollutants. The remarkable clonal variability of poplar allows to identify genotypes with a greater ability to accumulate/tolerate pollutants including heavy metals , Kopponen et al. 2001, Laureysens et al. 2004, Punshon & Dickinson 1997, Zalesny et al. 2005. Finally, poplar offers the advantage that, being the first "model tree species" whose genome has been sequenced (Tuskan et al. 2004), physiological and molecular mechanisms at the basis of metal tolerance can be more easily investigated at the transcriptomic level (Di Baccio et al. 2011).Plant symbiotic fungi, such as mycorrhizae, and soil bacteria can confer increased tolerance to stress (Gamalero et al. 2009). Arbuscular mycorrhizal fungi (AMF) form associations with the roots of the vast majority of land plants; the fungus colonizes the roots and forms arbuscules within root cortical cells thus improving plant nutrient uptake, especially phosphorus (Smith & Read 1997). Moreover, increasing evidence shows that symbiotic fungi contribute to plant adaptation to multiple biotic and abiotic stresses (Gohre & Paszkowski 2006, Lebeau et al. 2008, Lingua et al. 2002, Liu et al. 2007, Rodriguez & Redman 2008, Smith et al. 2010). In the case of HMs, the beneficial ef- Poplar is a suitable species for phytoremediation, able to tolerate high concentrations of heavy metals (HMs). Arbuscular mycorrhizal fungi (AMF) form symbiotic associatio...

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“…Esto ocasiona la disminución masiva de muchas poblaciones bacterianas, de las cuales sobrevive un número reducido, o bien elimina una gran proporción de las especies de estas comunidades. Así los suelos contaminados presentan muy baja diversidad biológica y reducida biomasa bacteriana (Smets et al 2003, Piotrowska-Seget et al 2005, Silver y Phung 2005, Bozo et al 2007, Dell'Amico et al 2008).Adicionalmente, estas condiciones de estrés provocan cambios fisiológicos en las bacterias que impiden su proliferación (McDougald et al 1998, Couter 2003, Darcan et al 2009, Cortez et al 2013.Los metales, cuya escoria es generada por actividades siderúrgicas, galvanización, minería, curtiembre de pieles y cueros, entre otras, al ser descargados y superar niveles críticos contaminan los ambientes naturales, fundamentalmente suelos y aguas, modificando la microbiota -incluyendo la bacteriana-, lo cual a posteriori modifica negativamente las características químicas y fisicoquímicas de los ecosistemas (Torsvik y Ǿvreas 2002).En este trabajo se determinan parámetros bioquí-micos (contenido de materia orgánica total, actividad ureásica, respiración basal y biomasa microbiana) y biológicos (carga y diversidad bacteriana) en muestras de suelos con bajas concentraciones de metales, consideradas permisibles según las normas para el control de la recuperación de materiales peligrosos y el manejo de los desechos peligrosos de la legislación venezolana vigente (Decreto 2635, Gaceta Oficial 1998 Adicionalmente, se identifican a nivel de género algunas de las cepas bacterianas aisladas del suelo impactado, se determina la resistencia y las concentraciones mínimas inhibitorias para níquel y cromo trivalente y hexavalente.Con los resultados obtenidos en este trabajo, se pretende dar una voz de alerta a los entes encargados de generar normativas ambientales en Venezuela, de tal manera que se puedan proponer cambios adecuados que eviten la modificación de la microbiota del suelo en cuanto a su diversidad y cantidad. …”

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Efectos Sobre Parámetros Bioquímicos Y Biológicos Bacterianos en Suelos Que Contienen Concentraciones Permisibles De Metales

Matute

Guerrero

Durán

et al. 2018

Rev. Int. Contam. Ambie.

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Palabras clave: diversidad bacteriana, carga bacteriana, contaminación con metales, normativas ambientales RESUMEN La contaminación de ambientes naturales por metales es básicamente producto de actividades antrópicas, tales como siderurgia, minería, galvanoplastia y Curtiembre es el lugar donde ocurre el proceso de curtido de pieles, no el proceso en sí de pieles y cuero. Como consecuencia, los microorganismos en los ambientes impactados se someten a condiciones estresantes, provocando una disminución de la biomasa y diversidad biológica, particularmente la bacteriana. En este estudio se reportan disminuciones estadísticamente significativas en el contenido de carbono orgánico total (70 %), actividad ureásica (54 %), biomasa bacteriana (47 %) y carga bacteriana (30-80 %) en suelos que contienen metales en niveles considerados permisibles por la legislación venezolana. El cociente respiración basal/biomasa microbiana se incrementó en 58 % respecto al suelo testigo. La diversidad bacteriana se redujo y se lograron aislar sólo 12 morfotipos en placas de agar LB suplementadas con sales ) fueron parámetros determinantes en la reducción de la diversidad y carga bacterianas. Los datos reportados deberían constituir un llamado de alerta a la autoridad ambiental venezolana para revisar y establecer los niveles permisibles de metales en ambientes naturales, de tal manera de que los parámetros bioquímicos y fisiológicos del suelo no se afecten negativamente; adicionalmente, la carga y diversidad microbianas deberían ser incluidas como bioindicadores de salud para suelos.Key words: bacterial diversity, bacterial load, contamination by metals, environmental normative ABSTRACT Contamination of natural environments by metals is basically due to anthropogenic activities such as iron and steel industries, mining, electroplating and tannery. As a A.J. Armado-Matute et al. 442consequence, proliferating microbes in such environments are subjected to stress conditions which induce decreases of the microbial diversity and biomass, particularly the bacterial one. This study reports statistical significant reductions of the total organic carbon content (70 %), urease activity (54 %), microbial biomass (47 %), and bacterial load (3080 %) in soil samples containing permissible levels of metals according to the Venezuelan legislation. Besides, the basal respiration/microbial biomass ratio increased 58 % respect to the witness soil. The bacterial diversity was severally reduced and only 12 bacterial morphotypes were isolated from agar LB plates supplemented with Cr ) were the most important parameters involved in reducing the bacterial diversity and load. The reported data should constitute an alarm call to the Venezuelan environmental authority to revise and set the metal permissible levels in natural environments, in such a way the soil biochemical and physiological parameters are not negatively affected; besides, microbial load and diversity should be included as health bioindicators to soils. INTRODUCCIÓNEl suelo es uno de ambientes na...

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Metal-tolerant bacteria occurring in heavily polluted soil and mine spoil

Cited by 174 publications

References 35 publications

Comparative plant growth promoting traits and distribution of rhizobacteria associated with heavy metals in contaminated soils

Comparative plant growth promoting traits and distribution of rhizobacteria associated with heavy metals in contaminated soils

Arbuscular mycorrhizal fungi as a tool to ameliorate the phytoremediation potential of poplar: biochemical and molecular aspects

Efectos Sobre Parámetros Bioquímicos Y Biológicos Bacterianos en Suelos Que Contienen Concentraciones Permisibles De Metales

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