Role of heavy metal tolerant rhizosphere bacteria in the phytoremediation of Cu and Pb using<i>Eichhornia crassipes</i>(Mart.) Solms

Kabeer, Raisa; Sylas, V. P.; Kumar, C. Sudarsana; Thomas, A. P.; Shanthiprabha, V.; Radhakrishnan, E. K.; Baiju, K. R.

doi:10.1080/15226514.2021.2007215

Cited by 14 publications

(6 citation statements)

References 61 publications

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“…The re-inoculation of strains ( Bacillus and Aeromonas sp.) isolated from E. crassipes facilitated in the removal of heavy metals by E. crassipes ( Kabeer et al., 2022 ). Based on the high-throughput analysis, the components of culture media could be optimized accordingly ( Dedysh, 2011 ), specifically for slow-growing, oligotrophic microorganisms that are difficult to manipulate in the laboratory, in order to isolate more functional bacterial strains with potential values.…”

Section: Discussionmentioning

confidence: 99%

Characterization of endophytic bacteriome diversity and associated beneficial bacteria inhabiting a macrophyte Eichhornia crassipes

Fan,

Schwinghamer,

Liu

et al. 2023

Front. Plant Sci.

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IntroductionThe endosphere of a plant is an interface containing a thriving community of endobacteria that can affect plant growth and potential for bioremediation. Eichhornia crassipes is an aquatic macrophyte, adapted to estuarine and freshwater ecosystems, which harbors a diverse bacterial community. Despite this, we currently lack a predictive understanding of how E. crassipes taxonomically structure the endobacterial community assemblies across distinct habitats (root, stem, and leaf).MethodsIn the present study, we assessed the endophytic bacteriome from different compartments using 16S rRNA gene sequencing analysis and verified the in vitro plant beneficial potential of isolated bacterial endophytes of E. crassipes.Results and discussionPlant compartments displayed a significant impact on the endobacterial community structures. Stem and leaf tissues were more selective, and the community exhibited a lower richness and diversity than root tissue. The taxonomic analysis of operational taxonomic units (OTUs) showed that the major phyla belonged to Proteobacteria and Actinobacteriota (> 80% in total). The most abundant genera in the sampled endosphere was Delftia in both stem and leaf samples. Members of the family Rhizobiaceae, such as in both stem and leaf samples. Members of the family Rhizobiaceae, such as Allorhizobium- Neorhizobium-Pararhizobium-Rhizobium were mainly associated with leaf tissue, whereas the genera Nannocystis and Nitrospira from the families Nannocystaceae and Nitrospiraceae, respectively, were statistically significantly associated with root tissue. Piscinibacter and Steroidobacter were putative keystone taxa of stem tissue. Most of the endophytic bacteria isolated from E. crassipes showed in vitro plant beneficial effects known to stimulate plant growth and induce plant resistance to stresses. This study provides new insights into the distribution and interaction of endobacteria across different compartments of E. crassipes Future study of endobacterial communities, using both culture-dependent and -independent techniques, will explore the mechanisms underlying the wide-spread adaptability of E. crassipesto various ecosystems and contribute to the development of efficient bacterial consortia for bioremediation and plant growth promotion.

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Section: Discussionmentioning

confidence: 99%

Characterization of endophytic bacteriome diversity and associated beneficial bacteria inhabiting a macrophyte Eichhornia crassipes

Fan,

Schwinghamer,

Liu

et al. 2023

Front. Plant Sci.

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“…Likewise, multifunctional micro-organisms are indispensable to the excellent phytoremediation presented by WH ( Figure 1 ). Antibiotics have been shown to be negatively correlated with the growth of WH, for instance, the oxytetracycline treatment significantly decreased the wet weight of WH [ 120 , 121 ]. Additionally, inoculation with Bacillus subtilis , B. mucilaginosus , or Aspergillus niger in WH roots promoted its biomass by increasing the maximum photochemical efficiency [ 122 ].…”

Section: Main Mechanisms Underlying Wh Utilization In Environmental S...mentioning

confidence: 99%

“…On the other hand, micro-organisms play a key role in the adsorption and/or degradation of WH toward various pollutants. For example, antibiotic treatments significantly reduce the remediation efficiency of Se, Cu and Pb by WH [ 121 , 124 ]. In addition, six bacterial isolates of which 16S rRNA sequences showed high similarity to P. diminuta , Brevundimonas diminuta , Nitrobacteria irancium , Ochrobactrum anthropi , and B. cereus , respectively, were isolated from the rhizosphere of WH [ 125 ].…”

Section: Main Mechanisms Underlying Wh Utilization In Environmental S...mentioning

confidence: 99%

The Multifaceted Function of Water Hyacinth in Maintaining Environmental Sustainability and the Underlying Mechanisms: A Mini Review

Gao

2022

IJERPH

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Water hyacinth (Eichhornia crassipes) (WH) is a widespread aquatic plant. As a top invasive macrophyte, WH causes enormous economic and ecological losses. To control it, various physical, chemical and biological methods have been developed. However, multiple drawbacks of these methods limited their application. While being a noxious macrophyte, WH has great potential in many areas, such as phytoremediation, manufacture of value-added products, and so on. Resource utilization of WH has enormous benefits and therefore, is a sustainable strategy for its control. In accordance with the increasing urgency of maintaining environmental sustainability, this review concisely introduced up to date WH utilization specifically in pollution remediation and curbing the global warming crisis and discussed the underlying mechanisms.

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“…Lead is a hazardous and non-biodegradable heavy metal often found in the Earth's crust. It is the second-most dangerous metal after As [11], posing serious threats to all life forms. The use of inorganic fertilizers and pesticides, mining, the burning of fossil fuels, the steel industry, atmospheric deposition, and electroplating contribute to heavy metal pollution [12].…”

Section: Introductionmentioning

confidence: 99%

Physiological, Morphological, and Biochemical Responses of Soybean [Glycine max (L.) Merr.] to Loquat (Eriobotrya japonica Lindl.) Leaf Extract Application on Pb-Contaminated Soil

Khalofah

Farooq

2023

Sustainability

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Lead (Pb) is a non-essential element; however, plants uptake it from soils rich in Pb. Soybean [Glycine max (L.) Merr.] is an important legume crop, and Pb toxicity exerts negative impacts on its growth and yield. This study investigated the role of foliar-applied loquat (Eriobotrya japonica Lindl.) leaf extract in improving the morphological, physiological, and biochemical traits of soybean plants under Pb toxicity. Soybean plants were exposed to four Pb concentrations (0, 200, 400, and 800 µg/L) and supplemented with 0% or 5% loquat leaf aqueous extract (EJLE). Data relating to pigments, proline, total soluble sugars, malondialdehyde (MDA), hydrogen peroxide (H2O2), non-enzymatic antioxidant, i.e., [ascorbic acid (AsA), glutathione (GSH), total phenolic contents (TPC), and total flavonoids content (TFC)] and enzymatic antioxidant, i.e., [superoxide dismutase (SOD), catalase (CAT), peroxidase (POD), ascorbate peroxidase (APX), and glutathione reductase (GR)] were recorded. Total chlorophyll contents and carotenoids were significantly decreased by Pb stress, while lycopene and anthocyanin contents were increased. Similarly, proline, total soluble sugars, MDA, H2O2, AsA, GSH, TPC, TFC, SOD, CAT, POD, APX, and GR were increased under Pb stress. Foliar spray of EJLE lowered MDA and H2O2 accumulation and increased the contents of chlorophylls, carotenoids, lycopene, anthocyanins, proline, total soluble sugars, and the antioxidant system. The increase in the activities of antioxidant enzymes lowered the adverse effects of Pb stress in soybean. Similarly, the application of EJLE lowered Pb accumulation in different plant parts compared to those receiving no EJLE. It is concluded that EJLE can improve the Pb tolerance of soybean plants by enhancing morphological, physiological, and biochemical traits. However, the actual mechanisms behind these improvements warrant further investigation.

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Role of heavy metal tolerant rhizosphere bacteria in the phytoremediation of Cu and Pb usingEichhornia crassipes(Mart.) Solms

Cited by 14 publications

References 61 publications

Characterization of endophytic bacteriome diversity and associated beneficial bacteria inhabiting a macrophyte Eichhornia crassipes

Characterization of endophytic bacteriome diversity and associated beneficial bacteria inhabiting a macrophyte Eichhornia crassipes

The Multifaceted Function of Water Hyacinth in Maintaining Environmental Sustainability and the Underlying Mechanisms: A Mini Review

Physiological, Morphological, and Biochemical Responses of Soybean [Glycine max (L.) Merr.] to Loquat (Eriobotrya japonica Lindl.) Leaf Extract Application on Pb-Contaminated Soil

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