Rhizobacteria inoculation benefits nutrient availability for phytostabilization in copper contaminated soil: Drivers from bacterial community structures in rhizosphere

Ju, Wenliang; Jin, Xiaolian; Liu, Lei; Shen, Guoting; Zhao, Wei; Duan, Chengjiao; Fang, Linchuan

doi:10.1016/j.apsoil.2019.103450

Cited by 68 publications

(28 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We identified 410 metabolites, of which over 50% of them contribute to the bioavailability of heavy metals, such as amino acids, organic acids, carbohydrates, nucleotides, and other primary and secondary metabolites ( Luo et al, 2017 ). Therefore, this study provides novel evidence that microbial metabolites have significant effects in activating heavy metals and promoting phytoremediation ( Yang et al, 2016 ; Jian et al, 2019 ; Akhtar et al, 2020 ; Huang et al, 2020 ; Ju et al, 2020 ; Tao et al, 2020 ).…”

Section: Discussionmentioning

confidence: 95%

“…The antioxidase system removes ROS through sequential and simultaneous enzymatic catalysis reactions ( Wu et al, 2020c ). Therefore, increases in the activities of SOD and CAT suggest that the Salix integra antioxidant defenses were promoted after inoculation with microorganisms ( Becana et al, 2000 ; Kong et al, 2015 ; Hidri et al, 2019 ; Ju et al, 2020 ). MDA (a cytotoxic product of lipid peroxidation) level is believed to be the best measure of lipid peroxidation status and cell membrane damage induced by ROS production ( Li et al, 2013 ).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Inoculation With Indigenous Rhizosphere Microbes Enhances Aboveground Accumulation of Lead in Salix integra Thunb. by Improving Transport Coefficients

et al. 2021

View full text Add to dashboard Cite

The application of plant–microbial remediation of heavy metals is restricted by the difficulty of exogenous microbes to form large populations and maintain their long-term remediation efficiency. We therefore investigated the effects of inoculation with indigenous heavy-metal-tolerant rhizosphere microbes on phytoremediation of lead (Pb) by Salix integra. We measured plant physiological indexes and soil Pb bioavailability and conducted widespread targeted metabolome analysis of strains to better understand the mechanisms of enhance Pb accumulation. Growth of Salix integra was improved by both single and co-inoculation treatments with Bacillus sp. and Aspergillus niger, increasing by 14% in co-inoculated plants. Transfer coefficients for Pb, indicating mobility from soil via roots into branches or leaves, were higher following microbial inoculation, showing a more than 100% increase in the co-inoculation treatment over untreated plants. However, Pb accumulation was only enhanced by single inoculation treatments with either Bacillus sp. or Aspergillus niger, being 10% greater in plants inoculated with Bacillus sp. compared with uninoculated controls. Inoculation mainly promoted accumulation of Pb in aboveground plant parts. Superoxide dismutase and catalase enzyme activities as well as the proline content of inoculated plants were enhanced by most treatments. However, soil urease and catalase activities were lower in inoculated plants than controls. Proportions of acid-soluble Pb were 0.34 and 0.41% higher in rhizosphere and bulk soil, respectively, of plants inoculated with Bacillus sp. than in that of uninoculated plants. We identified 410 metabolites from the microbial inoculations, of which more than 50% contributed to heavy metal bioavailability; organic acids, amino acids, and carbohydrates formed the three major metabolite categories. These results suggest that both indigenous Bacillus sp. and Aspergillus niger could be used to assist phytoremediation by enhancing antioxidant defenses of Salix integra and altering Pb bioavailability. We speculate that microbial strains colonized the soil and plants at the same time, with variations in their metabolite profiles reflecting different living conditions. We also need to consider interactions between inocula and the whole microbial community when applying microbial inoculation to promote phytoremediation.

show abstract

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Inoculation With Indigenous Rhizosphere Microbes Enhances Aboveground Accumulation of Lead in Salix integra Thunb. by Improving Transport Coefficients

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The diversity of bacterial species in the rhizosphere has been used as a biological indicator to estimate soil quality and fertility because they play a critical role in nitrogen fixation, hormone production, and nutrient distribution [8]. Similarly, they have contributed to the production and oxidation of methane and acetone, and have resulted in the enhancement of the soil pH, water composition, organic carbon content, and porosity [9,10].…”

Section: Introductionmentioning

confidence: 99%

Elucidating the Rhizosphere Associated Bacteria for Environmental Sustainability

Nwachukwu

Babalola

2021

Agriculture

View full text Add to dashboard Cite

The abundance of nutrient accumulation in rhizosphere soils has placed the rhizosphere as an “epicenter” of bacterial concentrations. Nonetheless, over the years, little attention has been given to bacterial inoculants and soil-like substrates. The reason is that many farmers and experiments have focused on chemical fertilizers as an approach to improve plant growth and yield. Therefore, we focused on assessing the application of rhizosphere soil and its associated bacteria for biotechnological applications. This review has been structured into major subunits: rhizosphere soil as a treasure trove for bacterial community concentration, biodegradation of lignocellulose for biofuel production, rhizosphere soil and its bacteria as soil amendments, and the role of rhizosphere soil and its bacteria for bioremediation and biofiltration. Hence, the efficient use of rhizosphere soil and its bacteria in an environmentally friendly way can contribute to healthy and sustainable environments.

show abstract

“…Different methods are currently used to inoculate plants with microorganisms. Ju et al (2020) demonstrated that plant root inoculation with plant growth-promoting (PGP) rhizobia increased the phytostabilization by improving alfalfa growth by decreasing Cu accumulation in shoots in a Cu-contaminated site. Seeds can also be soaked in a bacterial inoculum before germination, as shown by Ke et al (2021) where PGP bacteria enhanced ryegrass growth and phytostabilization in Cu–Cd-polluted soil.…”

Section: Introductionmentioning

confidence: 99%

Description of Microbial Communities of Phosphate Mine Wastes in Morocco, a Semi-Arid Climate, Using High-Throughput Sequencing and Functional Prediction

et al. 2021

View full text Add to dashboard Cite

Soil microbiota are vital for successful revegetation, as they play a critical role in nutrient cycles, soil functions, and plant growth and health. A rehabilitation scenario of the abandoned Kettara mine (Morocco) includes covering acidic tailings with alkaline phosphate mine wastes to limit water infiltration and hence acid mine drainage. Revegetation of phosphate wastes is the final step to this rehabilitation plan. However, revegetation is hard on this type of waste in semi-arid areas and only a few plants managed to grow naturally after 5 years on the store-and-release cover. As we know that belowground biodiversity is a key component for aboveground functioning, we sought to know if any structural problem in phosphate waste communities could explain the almost absence of plants. To test this hypothesis, bacterial and archaeal communities present in these wastes were assessed by 16S rRNA metabarcoding. Exploration of taxonomic composition revealed a quite diversified community assigned to 19 Bacterial and two Archaeal phyla, similar to other studies, that do not appear to raise any particular issues of structural problems. The dominant sequences belonged to Proteobacteria, Bacteroidetes, Actinobacteria, and Gemmatimonadetes and to the genera Massilia, Sphingomonas, and Adhaeribacter. LEfSe analysis identified 19 key genera, and metagenomic functional prediction revealed a broader phylogenetic range of taxa than expected, with all identified genera possessing at least one plant growth-promoting trait. Around 47% of the sequences were also related to genera possessing strains that facilitate plant development under biotic and environmental stress conditions, such as drought and heat.

show abstract

Rhizobacteria inoculation benefits nutrient availability for phytostabilization in copper contaminated soil: Drivers from bacterial community structures in rhizosphere

Cited by 68 publications

References 60 publications

Inoculation With Indigenous Rhizosphere Microbes Enhances Aboveground Accumulation of Lead in Salix integra Thunb. by Improving Transport Coefficients

Inoculation With Indigenous Rhizosphere Microbes Enhances Aboveground Accumulation of Lead in Salix integra Thunb. by Improving Transport Coefficients

Elucidating the Rhizosphere Associated Bacteria for Environmental Sustainability

Description of Microbial Communities of Phosphate Mine Wastes in Morocco, a Semi-Arid Climate, Using High-Throughput Sequencing and Functional Prediction

Contact Info

Product

Resources

About