Plant Growth‐Promoting Rhizobacteria (<scp>PGPR</scp>) Assisted Phytoremediation of Inorganic and Organic Contaminants Including Amelioration of Perturbed Marginal Soils

Franchi, Elisabetta; Fusini, Danilo

doi:10.1002/9781119670391.ch23

Cited by 6 publications

(6 citation statements)

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“…It can significantly in-crease the availability and uptake of nutrients for plants because of its ability to solubilize phosphates and zinc, fix ambient nitrogen into ammonia, and produce growth-regulating substances like indole-3-acetic acid (IAA), siderophores, and ammonia (Table 1). The role of mineral solubilizing bacteria have been acknowledged previously for their services under stressful conditions 14 (Franchi and Fusini, 2021;Mulani et al, 2021;Stegelmeier et al, 2022).Furthermore, the strain's ACC deaminase activity at different salt concentrations (Table 1; Figure 3) provides a mechanism to minimise the impacts of ethylene and enhance tolerance to a variety of abiotic environments like salinity and drought. These findings are also in agreement with other researchers who have inoculated PGPR and PGPE strains having Accdeaminase producing ability for mitigating salinity stress (Naing et al, 2021;Phour and Sindhu, 2022;Shahid et al, 2022;Singh et al, 2022).…”

Section: Principal Component and Pearson's Correlation Analysismentioning

confidence: 96%

ACC-Deaminase producing Pseudomonas putida RT12 inoculation: A promising strategy for improving Brassica juncea tolerance to salinity stress

ALHOQAIL

2024

Not Bot Horti Agrobo

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An important abiotic stressor that hinders plant growth, nutrient uptake, and global agricultural productivity is soil salinity. Among the different strategies to overcome the issue of salinity in agriculture sector, plant growth-promoting rhizobacteria (PGPR) have gained recognition as promising beneficial microbes that can improve plants’ response to biotic and abiotic stressors. The salinity tolerance and traits that promote plant growth of eight PGPR strains (RT1, RT2, RT3, RT4, RT5, RT7, and RT12) were evaluated in this study. During screening, one strain, RT12, had the highest plant growth-promoting activity and salt tolerance in the group. The strain when subjected to NaCl stress showed quantitative ACC-deaminase activity, in the presence of NaCl at various concentrations, demonstrating extraordinary tolerance to salt stress by withstanding doses of up to 3M NaCl. In order to further investigate the effects of salt stress on Brassica juncea (mustard), RT12, which was identified as Pseudomonas putida using 16s RNA sequencing, was inoculated. Two salt treatments (100 and 150 mM) were applied to the mustard variety ‘Mingora’ in a greenhouse. The results revealed that through ACC utilization, PGPR directly induced plant growth in salt-stressed mustard plants by lowering excess ethylene production. All plant parameters were negatively impacted by an increase in NaCl concentration in uninoculated plants. However, P. putida RT12 inoculation enhanced all growth parameters, antioxidant production, total soluble sugar (TSS), total protein (TP), proline, relative water content (RWC), chlorophyll contents, and nutrient uptake in salt-treated plants. The inoculation with P. putida also caused a marked decline in Na+ uptake and an increase in K+ uptake in the shoot. By maintaining a greater K+/Na+ ratio in the tissues of RT12-inoculated plants compared to controls, this change in ion uptake helped to maintain nutritional balance of the plants. The findings suggest that inoculating plants with ACC deaminase-producing PGPR, such as P. putida RT12, may boost growth and stress resistance.

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Section: Principal Component and Pearson's Correlation Analysismentioning

confidence: 96%

ACC-Deaminase producing Pseudomonas putida RT12 inoculation: A promising strategy for improving Brassica juncea tolerance to salinity stress

ALHOQAIL

2024

Not Bot Horti Agrobo

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“…In order to increase the effectiveness of remediation technologies, plant growth-promoting rhizobacteria, or PGPRs, are widely used in aided phytoremediation techniques (Franchi and Fusini, 2021;Franchi et al, 2019) [34,33] . Furthermore, they provide a viable approach to increase plant resistance to climate change.…”

Section: Plant Growth-promoting Rhizobacteria (Pgprs)mentioning

confidence: 99%

“…By reducing abiotic stresses brought on by excessive salinity, drought, alkalinity, and high temperatures, PGPRs act at the rhizosphere level, improving plant health and environmental adaption. Their use as microbial inoculants in phytoremediation aims to increase plant absorption of metals and increase biomass output in a sustainable manner (Franchi et al, 2019;Prakash et al, 2021) [33][34] . PGPRs are essential because they improve plants' capacity to fend off the damaging impacts of abiotic stressors (Enebe and Babalola, 2018; Shah et al, 2021) [30,88] .…”

Section: Plant Growth-promoting Rhizobacteria (Pgprs)mentioning

confidence: 99%

“…Because of their diverse metabolic activities, PGPRs can control how nutrients are absorbed by plants by modifying their structure and morphology at the root level in response to certain molecules (Such extracellular polymers, antioxidants, and phytohormones) generated during stressful situations. PGPRs can alleviate water stress inhibition in plant development under saline stress by enhancing nitrogen fixation, solubilizing inorganic phosphorus and other necessary elements, or forming hydrating biofilms (Franchi and Fusini, 2021;Dimpka et al, 2009) [34,26] . Consequently, by limiting erosion, PGPRs greatly aid in soil stabilisation and promote the growth of a robust, well-branched root system.…”

Section: Plant Growth-promoting Rhizobacteria (Pgprs)mentioning

confidence: 99%

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Remediation of heavy metals contamination in soil under global climate change situation: A review

Ingle,

Kamble,

Patil

et al. 2024

Int. J. Adv. Biochem. Res.

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In today's era there is a necessity to study the impact of climate change, particularly global warming, and its accompanying extreme events on soil pollution caused by heavy metal contamination, their mobility in soils, and potential remedies. Furthermore, with increasing concerns about soil health and the safety of agricultural products, heavy metal pollution in soil has become a significant global environmental challenge. Heavy metals, including cadmium, mercury, arsenic, lead, and chromium, possess biological toxicity and enter the soil ecosystem through both human activities and natural processes. This pollution poses a serious threat to all living organisms, including humans, due to the risk of accumulation in the food chain. In response to this challenge, resilient phytoremediation has emerged as a sustainable alternative to conventional methods, owing to its affordability, environmental friendliness, and visual appeal, it has been determined that more than 500 taxa are hyper accumulators of one or more metals due to their innate capacity to remove them from the soil. However, further study is required to improve plant tolerance and reduce the build-up of harmful heavy metals in soils. However, additional research combining biotechnological approaches with comprehensive multidisciplinary studies is required to enhance plant tolerance and decrease the accumulation of hazardous metals in soils. This review explores the sources of heavy metals, their behaviour in soil ecosystems under the influence of global climate change, and environmentally friendly remediation methods for removing heavy metals from soil.

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“…Similarly, wheat plants treated with different PGPBs like Bacillus sp., Azospirillum brasilense , Azospirillum liprum , and Pseudomonas stutzeri as a consortium resulted in increased plant biomass and relative water content via producing different phytohormones. Using the appropriate features that distinguish them as plant-growth promoters, soil bacteria can enhance plant nutritional status under salt stress in various ways ( Franchi and Fusini, 2021 ; Gao et al., 2022 ). Salt stress led to a significant reduction in the biomass of wheat plants, with the decline being more pronounced under high salt stress conditions compared to lower stress levels ( Radi et al., 2013 ).…”

Section: Introductionmentioning

confidence: 99%

Exploring the potential of halotolerant bacteria from coastal regions to mitigate salinity stress in wheat: physiological, molecular, and biochemical insights

Aizaz,

Lubna,

Ahmad

et al. 2023

Front. Plant Sci.

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Salinity stress, a significant global abiotic stress, is caused by various factors such as irrigation with saline water, fertilizer overuse, and drought conditions, resulting in reduced agricultural production and sustainability. In this study, we investigated the use of halotolerant bacteria from coastal regions characterized by high salinity as a solution to address the major environmental challenge of salinity stress. To identify effective microbial strains, we isolated and characterized 81 halophilic bacteria from various sources, such as plants, rhizosphere, algae, lichen, sea sediments, and sea water. We screened these bacterial strains for their plant growth-promoting activities, such as indole acetic acid (IAA), phosphate solubilization, and siderophore production. Similarly, the evaluation of bacterial isolates through bioassay revealed that approximately 22% of the endophytic isolates and 14% of rhizospheric isolates exhibited a favorable influence on seed germination and seedling growth. Among the tested isolates, GREB3, GRRB3, and SPSB2 displayed a significant improvement in all growth parameters compared to the control. As a result, these three isolates were utilized to evaluate their efficacy in alleviating the negative impacts of salt stress (150 mM, 300 mM, and seawater (SW)) on the growth of wheat plants. The result showed that shoot length significantly increased in plants inoculated with bacterial isolates up to 15% (GREB3), 16% (GRRB3), and 24% (SPSB2), respectively, compared to the control. The SPSB2 strain was particularly effective in promoting plant growth and alleviating salt stress. All the isolates exhibited a more promotory effect on root length than shoot length. Under salt stress conditions, the GRRB3 strain significantly impacted root length, leading to a boost of up to 6%, 5%, and 3.8% at 150 mM, 300 mM, and seawater stress levels, respectively. The bacterial isolates also positively impacted the plant’s secondary metabolites and antioxidant enzymes. The study also identified the WDREB2 gene as highly upregulated under salt stress, whereas DREB6 was downregulated. These findings demonstrate the potential of beneficial microbes as a sustainable approach to mitigate salinity stress in agriculture.

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Plant Growth‐Promoting Rhizobacteria (PGPR) Assisted Phytoremediation of Inorganic and Organic Contaminants Including Amelioration of Perturbed Marginal Soils

Cited by 6 publications

References 132 publications

ACC-Deaminase producing Pseudomonas putida RT12 inoculation: A promising strategy for improving Brassica juncea tolerance to salinity stress

ACC-Deaminase producing Pseudomonas putida RT12 inoculation: A promising strategy for improving Brassica juncea tolerance to salinity stress

Remediation of heavy metals contamination in soil under global climate change situation: A review

Exploring the potential of halotolerant bacteria from coastal regions to mitigate salinity stress in wheat: physiological, molecular, and biochemical insights

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