Improving Phytoremediation through Plant‐Associated Bacteria

Germaine, Kieran J.; McGuinness, Mark; Dowling, David N.

doi:10.1002/9781118297674.ch91

Cited by 12 publications

(8 citation statements)

References 99 publications

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“…The mechanisms underlying the role of plant associated bacteria in phytoremediation of environments contaminated with HMs or organic xenobiotics, in general (Germaine et al, 2013), and alkanes, in particular (Afzal et al, 2013), have recently been analyzed. These mechanisms include improvement of plant growth, nutrient (P and N) supply, production of Fe-binding siderophores, plant hormones production, enhanced ACC-deaminase activity (ethylene reductions), organic xenobiotic degradation, etc.…”

Section: Improving the Ability Of Soil Microorganisms For The Phytorementioning

confidence: 99%

“…Another mechanism for improving phytoremediation is the bio-augmentation of plant associated microbial communities based on horizontal gene transfer (Germaine et al, 2013). This mechanism, a challenge of future research, relies on that many resistance genes involved in HMs bioremediation processes are located in plasmids that can be transferred within the bacterial communities.…”

Section: Improving the Ability Of Soil Microorganisms For The Phytorementioning

confidence: 99%

“…The complete genomes of a number of plant-associated bacteria are becoming available. This, together with the genome sequence of diverse plant host, would facilitate establishing the molecular communications between plant and bacteria, a key step to provide new insights allowing for design improved strategies in phytoremediation (Germaine et al, 2013;Afzal et al, 2013).…”

Section: Improving the Ability Of Soil Microorganisms For The Phytorementioning

confidence: 99%

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Future challenges and perspectives for applying microbial biotechnology in sustainable agriculture based on a better understanding of plant-microbiome interactions

Barea

2015

J. Soil Sci. Plant Nutr.

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An intensive agricultural production is necessary to satisfy food requirements for the growing world population. However, its realization is associated with the mass consumption of non-renewable natural resources and with the emission of greenhouse gases causing climate changes. The research challenge is to meet sustainable environmental and economical issues without compromising yields. In this context, exploiting the agroecosystem services of soil microbial communities appears as a promising effective approach. This chapter reviews the research efforts aimed at improving a sustainable and healthy agricultural production through the appropriate management of soil microorganisms. First, the plant-associated microbiome is briefly described. Then, the current research technologies for formulation and application of inocula based on specific beneficial plant-associated microbes are summarized. Finally, the perspectives and opportunities to manage naturally existing microbial populations, including those non-culturable, are analyzed. This analysis concerns: (i) a description of the already available, culture-independent, molecular techniques addressed at increasing our understanding of root-microbiome interactions; (ii) how to improve the ability of soil microbes for alleviating the negative impacts of stress factors on crop productivity; and (iii) whether plants can structure their rootassociated microbial communities and, leading on from this, whether the rhizosphere can be engineered (biased) to encourage beneficial organisms, while prevent presence of pathogens.

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Section: Improving the Ability Of Soil Microorganisms For The Phytorementioning

confidence: 99%

Section: Improving the Ability Of Soil Microorganisms For The Phytorementioning

confidence: 99%

Section: Improving the Ability Of Soil Microorganisms For The Phytorementioning

confidence: 99%

See 1 more Smart Citation

Future challenges and perspectives for applying microbial biotechnology in sustainable agriculture based on a better understanding of plant-microbiome interactions

Barea

2015

J. Soil Sci. Plant Nutr.

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“…The selection and identification of nitrogen-fixing bacteria tolerant to and capable of the bioremoval of HMs in contaminated areas is important because it enables the use of the intrinsic characteristics of these bacteria combined with the phytoremediation technique, promoting plant growth and favouring the removal of HMs through different mechanisms in different stages of the remediation process (Germaine et al 2013).…”

Section: Tolerance Of Tropical Rhizobia To Hmsmentioning

confidence: 99%

Heavy Metal Contamination of Soils

Sherameti¹,

Varma²

2015

Soil Biology

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“…Numerous studies have in this context shown an increase in degradation of PCBs, involving mostly the low-halogenated congeners in vegetated soil as compared with non-vegetated soil [1,[7][8][9]; this is the so-called plant-assisted bioremediation [4]. In the rhizosphere, the plant-microorganism association can increase the degradation of PCBs due to synergic exchanges between the natural soil microbial community and roots [9][10][11][12]. In fact, plant roots provide a large surface on which microbial cells can increase in number and be helped to spread through the soil.…”

mentioning

confidence: 99%

Microcosm Experiment to Assess the Capacity of a Poplar Clone to Grow in a PCB-Contaminated Soil

Nogués

Grenni

Lenola

et al. 2019

Water

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Polychlorinated byphenyls (PCBs) are a class of Persistent Organic Pollutants extremely hard to remove from soil. The use of plants to promote the degradation of PCBs, thanks to synergic interactions between roots and the natural soil microorganisms in the rhizosphere, has been proved to constitute an effective and environmentally friendly remediation technique. Preliminary microcosm experiments were conducted in a greenhouse for 12 months to evaluate the capacity of the Monviso hybrid poplar clone, a model plant for phytoremediation, to grow in a low quality and PCB-contaminated soil in order to assess if this clone could be subsequently used in a field experiment. For this purpose, three different soil conditions (Microbiologically Active, Pre-sterilized and Hypoxic soils) were set up in order to assess the capacity of this clone to grow in the polluted soil in these different conditions and support the soil microbial community activity. The growth and physiology (chlorophyll content, chlorophyll fluorescence, ascorbate, phenolic compounds and flavonoid contents) of the poplar were determined. Moreover, chemical analyses were performed to assess the concentrations of PCB indicators in soil and plant roots. Finally, the microbial community was evaluated in terms of total abundance and activity under the different experimental conditions. Results showed that the poplar clone was able to grow efficiently in the contaminated soil and to promote microbial transformations of PCBs. Plants grown in the hypoxic condition promoted the formation of a higher number of higher-chlorinated PCBs and accumulated lower PCBs in their roots. However, plants in this condition showed a higher stress level than the other microcosms, producing higher amounts of phenolic, flavonoid and ascorbate contents, as a defence mechanism.2 of 17 several countries since 1979, there is still much environmental contamination. Their elimination from contaminated areas is therefore a challenge [1].Natural restoration strategies are preferred since they use existing flows of energy and matter, take advantage of local solutions and follow seasonal and climatic changes in ecosystems [2,3]. Among natural-based remediation strategies, the use of plants to promote PCB degradation in the rhizosphere (plant assisted bioremediation, [4]) can be an effective, cost-competitive and environmentally friendly alternative to the most traditional remediation techniques [5].Despite the high chemical stability and low bioavailability of PCBs, they can potentially undergo biological degradation. The latter involves bacteria, fungi and plants, and can occur differently in aerobic and anaerobic conditions. Anaerobic reductive dechlorination happens when PCBs serve as electron acceptors, thus being turned into less chlorinated congeners, and aerobic transformation involves the lower-halogenated congeners (<5 Cl) and leads to the breakdown of the biphenyl structure [6]. Numerous studies have in this context shown an increase in degradation of PCBs, involving mostly the low-...

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Improving Phytoremediation through Plant‐Associated Bacteria

Cited by 12 publications

References 99 publications

Future challenges and perspectives for applying microbial biotechnology in sustainable agriculture based on a better understanding of plant-microbiome interactions

Future challenges and perspectives for applying microbial biotechnology in sustainable agriculture based on a better understanding of plant-microbiome interactions

Heavy Metal Contamination of Soils

Microcosm Experiment to Assess the Capacity of a Poplar Clone to Grow in a PCB-Contaminated Soil

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