Role of plant growth-promoting rhizobacteria in boosting the phytoremediation of stressed soils: Opportunities, challenges, and prospects

Bhanse, Poonam; Kumar, Manish; Singh, Lal; Awasthi, Mukesh Kumar; Qureshi, Asifa

doi:10.1016/j.chemosphere.2022.134954

Cited by 101 publications

(40 citation statements)

References 220 publications

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“…Degraded soil restoration and sustainability are imperative and emergent. Phytoremediation has become a prevalent strategy for degraded soil remediation due to its environmental friendliness and sustainable advantages (Liu et al, 2018;Ali et al, 2020;Wei et al, 2021;Bhanse et al, 2022;Bhat et al, 2022). Roots cope with a variety of biotic and abiotic stresses at the root-soil interface by secreting various organic and inorganic chemicals that play an important role in resisting environmental stress and the process of phytoremediation (Bais et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Leymus chinensis resists degraded soil stress by modulating root exudate components to attract beneficial microorganisms

Lin

Mei²,

Wei³

et al. 2022

Front. Microbiol.

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Phytoremediation is an effective means to improve degraded soil nutrients and soil structure. Here, we investigated the remediation effects of Leymus chinensis on the physicochemical properties and structure of degraded soil after 3 years of cultivation and explored the bacterial and fungal drivers in root exudates by metabolomics and high-throughput sequencing. The results showed that root exudates increased soil organic matter (SOM), total nitrogen (TN), total phosphorus (TP) and soil aggregates, and organic acids in root exudates reduced pH and activated insoluble nutrients into forms that are available to plants, such as available nitrogen (NH4+-N), nitrate nitrogen (NO3−-N), and available phosphorus (AP). The cultivation of L. chinensis restored the diversity and richness of soil microorganisms and recruited potential beneficial bacteria and fungi to resist degraded soil stress, and L. chinensis also regulated the abundances of organic acids, amino acids and fatty acids in root exudates to remediate degraded soils. Spearman correlation analysis indicated that glutaric acid, 3-hydroxybutyric acid and 4-methylcatechol in root exudates attracted Haliangium, Nitrospira and Mortierella to the rhizosphere and dispersed the relative abundance of the harmful microorganisms Fusicolla and Fusarium. Our results demonstrate that L. chinensis enhances soil fertility, improves soil structure, promotes microbial diversity and abundance, and recruits potentially beneficial microorganisms by modulating root exudate components.

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Section: Introductionmentioning

confidence: 99%

Leymus chinensis resists degraded soil stress by modulating root exudate components to attract beneficial microorganisms

Lin

Mei²,

Wei³

et al. 2022

Front. Microbiol.

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“…In our study, significant differences in plant growth were observed between inoculated and uninoculated duckweed plants ( Table 4 ), which might indicate the direct contribution of biomass growth to the degradation of NEOs in duckweed. In addition, considering that co-metabolism is the most common mechanism used by organic pollutant-degrading bacteria ( Bhanse et al, 2022 ), it would be possible that strain FC02 would have used duckweed root exudates as energy source to degrade NEOs. Alvarez et al (2022) also reported that biodegradation of hexachlorocyclohexane isomers by Sphingobium sp.…”

Section: Resultsmentioning

confidence: 99%

Removal of Dinotefuran, Thiacloprid, and Imidaclothiz Neonicotinoids in Water Using a Novel Pseudomonas monteilii FC02–Duckweed (Lemna aequinoctialis) Partnership

Cai

Zhu

et al. 2022

Front. Microbiol.

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Neonicotinoids (NEOs) are the most widely used insecticides in the world and pose a serious threat to aquatic ecosystems. The combined use of free-floating aquatic plants and associated microorganisms has a tremendous potential for remediating water contaminated by pesticides. The aim of this study was to determine whether plant growth-promoting bacteria (PGPB) could enhance the phytoremediation efficiency of duckweed (Lemna aequinoctialis) in NEO-contaminated water. A total of 18 different bacteria were isolated from pesticide-stressed agricultural soil. One of the isolates, Pseudomonas monteilii FC02, exhibited an excellent ability to promote duckweed growth and was selected for the NEO removal experiment. The influence of strain FC02 inoculation on the accumulation of three typical NEOs (dinotefuran, thiacloprid, and imidaclothiz) in plant tissues, the removal efficiency in water, and plant growth parameters were evaluated during the 14-day experimental period. The results showed that strain FC02 inoculation significantly (p < 0.05) increased plant biomass production and NEO accumulation in plant tissues. The maximum NEO removal efficiencies were observed in the inoculated duckweed treatment after 14 days, with 92.23, 87.75, and 96.42% for dinotefuran, thiacloprid, and imidaclothiz, respectively. This study offers a novel view on the bioremediation of NEOs in aquatic environments by a PGPB–duckweed partnership.

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“…In chrome-contaminated soils, previous studies have found the existence of Cr-reducing bacteria and tolerant bacteria, which play an important role in maintaining the stability of soil microenvironment and plant growth (Bhanse et al, 2022). In this study, it was found that Proteobacteria, Actinobacteria, Firmicutes and Bacteroidetes showed an increasing trend in the overall abundance compared with the blank group (Figure 4).…”

Section: Discussionmentioning

confidence: 99%

Effects of Cr stress on bacterial community structure and diversity in rhizosphere soils of Iris pseudacorus

Wei¹,

Zhu²,

Yang³

et al. 2022

Preprint

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Rhizosphere microorganisms play an important role in improving soil microenvironment, which contributes to plant growth under heavy metal stress. However, the effect of chromium (Cr) on plant rhizosphere bacterial community is still unknown. In this paper, sole-cultivated pattern, two-cultivated pattern and three-cultivated pattern, combined with 16S rRNA high-throughput sequencing technology, the effects of Cr stress on bacterial community structure and diversity in rhizosphere soil of Iris Pseudacorus were analyzed. The results showed that under Cr stress, I. Pseudacorus showed good tolerance and enrichment. However, under Cr stress, the Alpha diversity indices (Shannon, Chao and Sobs) of rhizosphere bacterial community decreased by 9.1%, 30.3% and 28.0% on average, respectively. The change of bacterial community was 22.6% due to Cr stress, and the common species of bacterial community decreased by 4.2%. Proteobacteria, Actinobacteria, Acidobacteria, Firmicutes and Gemmatimonadetes accounted for more than 78.2% of the total sequence. With the increase of plant diversity, Bacteroides and Pseudomonas appeared successively, and the abundance of the dominant species increased obviously. Through the symbiotic network diagram, it was found that the synergistic effect between dominant species in two-cultivated pattern was significantly enhanced, and the soil microenvironment was significantly improved. In conclusion, the results of this study will provide a reference for understanding the response of rhizosphere bacterial community to heavy metal Cr and the interaction between wetland plants and rhizosphere bacteria during wetland phytoremediation.

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Role of plant growth-promoting rhizobacteria in boosting the phytoremediation of stressed soils: Opportunities, challenges, and prospects

Cited by 101 publications

References 220 publications

Leymus chinensis resists degraded soil stress by modulating root exudate components to attract beneficial microorganisms

Leymus chinensis resists degraded soil stress by modulating root exudate components to attract beneficial microorganisms

Removal of Dinotefuran, Thiacloprid, and Imidaclothiz Neonicotinoids in Water Using a Novel Pseudomonas monteilii FC02–Duckweed (Lemna aequinoctialis) Partnership

Effects of Cr stress on bacterial community structure and diversity in rhizosphere soils of Iris pseudacorus

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