Phytoremediation of a multi contaminated soil: mercury and arsenic phytoextraction assisted by mobilizing agent and plant growth promoting bacteria

Franchi, Elisabetta; Rolli, Eleonora; Marasco, Ramona; Agazzi, Gloria; Borin, Sara; Cosmina, Paola; Pedron, Francesca; Rosellini, Irene; Barbafieri, Meri; Petruzzelli, G.

doi:10.1007/s11368-015-1346-5

Cited by 118 publications

(29 citation statements)

References 42 publications

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“…These results indicate the soils had a high number of infective propagules, such as spores (Figure C), native fungi, possibly ecotypes adapted to conditions of high concentration of metals. The obtained results thus confirm others work which report that the interaction of plants with soil microorganism, such as mycorrhizal fungi and the N 2 ‐fixing rhizobia, can promote plant growth, especially under suboptimal conditions . Previous studies report the presence of symbiosis with N 2 ‐fixing bacteria in leguminous species may assist in the phytoremediation process of metal‐contaminated soils because the symbiosis helps nitrogen nutrition and positively affects plant growth …”

Section: Discussionsupporting

confidence: 89%

Phytoremediation Potential of Jack Bean Plant for Multi‐Element Contaminated Soils From Ribeira Valley, Brazil

Silva

Andrade

Campos

2018

CLEAN Soil Air Water

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Soil contamination with metal(oid)s is of concern due to deleterious effects on ecosystems, plants, and human health. This study aims at determining the potential of jack bean, Canavalia ensiformis, to be used as phytoremediator of soils contaminated with Pb, Zn, and As from past mining activities in the Ribeira Valley, Brazil. A pot experiment is conducted using soils collected from two areas contaminated with different concentrations of Pb, As, and Zn. Only in the most contaminated soil, elemental concentrations are above the limit established for agricultural purposes by Brazilian regulatory agencies. Plant tolerance is evaluated in terms of growth, elemental accumulation, establishment of root symbiosis, and biochemical indicators of metal toxicity. Plants are able to produce high biomass without signs of oxidative stress. The content of free amino acids in leaves increases when plants grown in the soil with higher metal(oid) concentrations indicating changes in physiology. Mycorrhizal symbiosis is established; however, nodulation with native rhizobia is strongly inhibited in the most contaminated soil. Jack bean roots act as a barrier to translocation retaining most of the absorbed metals, especially for Pb. The translocation index for Zn and As is higher than for Pb. In conclusion, jack bean plant can be considered of interest for phytostabilization of multi‐element contaminated soils due to its high capacity for immobilizing potentially toxic elements in roots. Although Zn and As are more mobile and accumulate in concentration levels above phytotoxicity thresholds, C. ensiformis is a tolerant species.

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Section: Discussionsupporting

confidence: 89%

Phytoremediation Potential of Jack Bean Plant for Multi‐Element Contaminated Soils From Ribeira Valley, Brazil

Silva

Andrade

Campos

2018

CLEAN Soil Air Water

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“…Plants are not able to tolerate very heavy metal stress conditions, bacteria are competent to neutralize the heavy metal toxicity by binding with their negatively charged functional group, and this process is known as biosorption [335,336]. Phytoremediation is a process in which PGPR colonize the root of the plants and helps in mobilization of contaminates in the form of consortia, enhance the detoxification of contaminants, and also increase the plant biomass and grain yields [337].…”

Section: Pgpr Can Be Used For Phytoremediationmentioning

confidence: 99%

PGPR‐mediated induction of systemic resistance and physiochemical alterations in plants against the pathogens: Current perspectives

et al. 2020

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Plant growth‐promoting rhizobacteria (PGPR) are diverse groups of plant‐associated microorganisms, which can reduce the severity or incidence of disease during antagonism among bacteria and soil‐borne pathogens, as well as by influencing a systemic resistance to elicit defense response in host plants. An amalgamation of various strains of PGPR has improved the efficacy by enhancing the systemic resistance opposed to various pathogens affecting the crop. Many PGPR used with seed treatment causes structural improvement of the cell wall and physiological/biochemical changes leading to the synthesis of proteins, peptides, and chemicals occupied in plant defense mechanisms. The major determinants of PGPR‐mediated induced systemic resistance (ISR) are lipopolysaccharides, lipopeptides, siderophores, pyocyanin, antibiotics 2,4‐diacetylphoroglucinol, the volatile 2,3‐butanediol, N‐alkylated benzylamine, and iron‐regulated compounds. Many PGPR inoculants have been commercialized and these inoculants consequently aid in the improvement of crop growth yield and provide effective reinforcement to the crop from disease, whereas other inoculants are used as biofertilizers for native as well as crops growing at diverse extreme habitat and exhibit multifunctional plant growth‐promoting attributes. A number of applications of PGPR formulation are needed to maintain the resistance levels in crop plants. Several microarray‐based studies have been done to identify the genes, which are associated with PGPR‐induced systemic resistance. Identification of these genes associated with ISR‐mediating disease suppression and biochemical changes in the crop plant is one of the essential steps in understanding the disease resistance mechanisms in crops. Therefore, in this review, we discuss the PGPR‐mediated innovative methods, focusing on the mode of action of compounds authorized that may be significant in the development contributing to enhance plant growth, disease resistance, and serve as an efficient bioinoculants for sustainable agriculture. The review also highlights current research progress in this field with a special emphasis on challenges, limitations, and their environmental and economic advantages.

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“…In some instances where soil is contaminated with multiple types of HM, use of HMT-PGP microbes with additives (nutrients) is found to be more useful. Recently in microcosm-scale phytoextraction experiments, Franchi et al (2017) showed that addition of thiosulfate with HMT-PGP microbes enhanced mobilization and uptake of As and Hg in B. juncea and L. albus grown in soil polluted with both metals. For phytoextraction of HM, use of non-food crops such as those used in timber or other commercial purposes (not involving human or animal consumption) can be targeted.…”

Section: Applications and Future Challengesmentioning

confidence: 99%

Alleviation of Heavy Metal Stress in Plants and Remediation of Soil by Rhizosphere Microorganisms

2017

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Increasing concentration of heavy metals (HM) due to various anthropogenic activities is a serious problem. Plants are very much affected by HM pollution particularly in contaminated soils. Survival of plants becomes tough and its overall health under HM stress is impaired. Remediation of HM in contaminated soil is done by physical and chemical processes which are costly, time-consuming, and non-sustainable. Metal–microbe interaction is an emerging but under-utilized technology that can be exploited to reduce HM stress in plants. Several rhizosphere microorganisms are known to play essential role in the management of HM stresses in plants. They can accumulate, transform, or detoxify HM. In general, the benefit from these microbes can have a vast impact on plant’s health. Plant–microbe associations targeting HM stress may provide another dimension to existing phytoremediation and rhizoremediation uses. In this review, applied aspects and mechanisms of action of heavy metal tolerant-plant growth promoting (HMT-PGP) microbes in ensuring plant survival and growth in contaminated soils are discussed. The use of HMT-PGP microbes and their interaction with plants in remediation of contaminated soil can be the approach for the future. This low input and sustainable biotechnology can be of immense use/importance in reclaiming the HM contaminated soils, thus increasing the quality and yield of such soils.

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Phytoremediation of a multi contaminated soil: mercury and arsenic phytoextraction assisted by mobilizing agent and plant growth promoting bacteria

Cited by 118 publications

References 42 publications

Phytoremediation Potential of Jack Bean Plant for Multi‐Element Contaminated Soils From Ribeira Valley, Brazil

Phytoremediation Potential of Jack Bean Plant for Multi‐Element Contaminated Soils From Ribeira Valley, Brazil

PGPR‐mediated induction of systemic resistance and physiochemical alterations in plants against the pathogens: Current perspectives

Alleviation of Heavy Metal Stress in Plants and Remediation of Soil by Rhizosphere Microorganisms

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