Role of Plant Growth-Promoting Rhizobacteria (PGPR) for Crop Stress Management

Kabiraj, Ashutosh; Majhi, Krishnendu; Halder, Urmi; Let, Moitri; Bandopadhyay, Rajib

doi:10.1007/978-3-030-45669-6_17

Cited by 18 publications

(13 citation statements)

References 113 publications

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“…Interaction of plant-microbe is the primary factor determining productivity, plant health, and soil fertility. Kabiraj et al (2020) cited that bacteria inoculants can increase the agronomic parameters significantly, which helps alleviate the cost of production and environmental pollution Souza et al (2015). Microbes proved as cost-effective, efficient, more promising, and sustainable approaches and contribute to plants development.…”

Section: Resultsmentioning

confidence: 99%

Isolation, Purification and Application of Siderophore Producing Bacteria to Improve Wheat Growth

Ehsan¹,

Riaz²,

Qureshi³

et al. 2022

PJAR

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Iron (Fe), being an essential micronutrient, is necessary for human health and to maintain the integrity and development of the plant. In Fe-limiting conditions, plants and plant growth-promoting rhizobacterial (PGPR) have a siderophore production mechanism. Inoculation with seed soaking of such siderophore-producing bacteria can be a cost-effective biofortification technique. The current study includes the collection of rhizobacterial isolates from wheat, maize, sorghum, millet, and maize rhizosphere soil of Rawalpindi and Sargodha divisions. The screening of bacterial isolates for siderophore production through CAS-shuttle assay (quantitative) and CAS-agar (qualitative) was done. Isolates were further characterized for Fe and phosphorus solubilization, indole acidic acid (IAA) equivalents, and organic acid production. The growth chamber and field study was planned to evaluate the effectiveness of these isolates on the growth and yield parameters of wheat. Total bacterial isolates were 50, out of which 15 isolates were found significantly positive for the production of siderophore and solubilizing of nutrients. The (SPS10) produced a comparatively high percentage of 46.2 % siderophore units, as shown by results between positive isolates. Out of 15 positive, 7 isolates significantly improved root/shoot growth over control in the growth chamber study. Inoculation with siderophore-producing bacteria showed a significant increase in plant height, grain yield, spike length, grain weight, no. of tillers plant -1 , and wheat quality in a field trial. The results from the current study proposed that in the plant, rhizobacteria can also play a beneficial role in nutrient translocation to plants efficiently and nutrients uptake from the soil insoluble form.

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Section: Resultsmentioning

confidence: 99%

Isolation, Purification and Application of Siderophore Producing Bacteria to Improve Wheat Growth

Ehsan¹,

Riaz²,

Qureshi³

et al. 2022

PJAR

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“…In addition to the mechanisms mentioned above, in order to survive under salt stress, PGPR may alter salt tolerant gene expressions. The expression of TaABARE, TaOPR1, TaMYB, TaWRKY, TaST, SOS1, SOS4, TaNHX1, TaHAK, and TaHKT1 genes were up-regulated in PGPR inoculated plants leading to the expression of stress related genes [ 143 , 144 ]. According to the findings, salinity tolerance genes ZmNHX1, ZmNHX2, ZmN HX3, ZmWRKY58, and ZmDREB2A were up-regulated, as well as the antioxidants ZmGR1 (Zea mays glutathione reductase) and ZmAPX1’s (Zea mays ascorbate peroxidase) transcript levels [ 145 , 146 ].…”

Section: Organic Amendments For Salinity Stress Mitigationmentioning

confidence: 99%

Organic Amendments for Mitigation of Salinity Stress in Plants: A Review

Hoque

Imran²,

Hannan³

et al. 2022

Life

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Natural and/or human-caused salinization of soils has become a growing problem in the world, and salinization endangers agro-ecosystems by causing salt stress in most cultivated plants, which has a direct effect on food quality and quantity. Several techniques, as well as numerous strategies, have been developed in recent years to help plants cope with the negative consequences of salt stress and mitigate the impacts of salt stress on agricultural plants. Some of them are not environmentally friendly. In this regard, it is crucial to develop long-term solutions that boost saline soil productivity while also protecting the ecosystem. Organic amendments, such as vermicompost (VC), vermiwash (VW), biochar (BC), bio-fertilizer (BF), and plant growth promoting rhizobacteria (PGPR) are gaining attention in research. The organic amendment reduces salt stress and improves crops growth, development and yield. The literature shows that organic amendment enhances salinity tolerance and improves the growth and yield of plants by modifying ionic homeostasis, photosynthetic apparatus, antioxidant machineries, and reducing oxidative damages. However, the positive regulatory role of organic amendments in plants and their stress mitigation mechanisms is not reviewed adequately. Therefore, the present review discusses the recent reports of organic amendments in plants under salt stress and how stress is mitigated by organic amendments. The current assessment also analyzes the limitations of applying organic amendments and their future potential.

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“…In contrast, the phenylpropanoids only varied in LS-treated rhubarb, with 3,6-diferuloylsucrose undergoing upregulation and feruloylsinapoyltartaric acid incurring downregulation. Numerous flavonoids were identified (18), including flavones and flavonols, with these being highly expressed in rhubarbs under either the LS or LB treatment, but with a downregulated level in LB + LS. Another large group was that of phenolic compounds (19), whose accumulation reached high levels in the LB + LS rhubarbs.…”

Section: Metabolic Differences Of R Palmatum Roots Under the Pgpm And Sucrose Treatmentsmentioning

confidence: 99%

“…Bacillus isolates colonize host plant roots and promote plant growth by producing bio compounds, such as the hormone indole-3-acetic acid (IAA), as well as spermidine and 2,3-butanediol [4,8,9], by defending against pests and pathogens by producing antibiotic substances such as hydrogen cyanide (HCN), chitinase, and siderophores [10][11][12], and by competing for nutrients and micro-niches, as well as induction of plant resistance [13][14][15]. Some studies have reported on the synergistic and antagonistic effects of PGPM, as well as other microorganisms within the rhizosphere and beyond (in bulk soil), which could indirectly facilitate plant growth [16][17][18]. Moreover, Bacillus-based biofertilizers display high resilience to heat and drought due to their endospores-forming ability.…”

Section: Introductionmentioning

confidence: 99%

Bacterial Inoculant and Sucrose Amendments Improve the Growth of Rheum palmatum L. by Reprograming Its Metabolite Composition and Altering Its Soil Microbial Community

Tian

Liu

Yue

et al. 2022

IJMS

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Rheum palmatum L. is an important traditional Chinese medicinal herb now in demand worldwide. Recently, the theoretical framework suggested that sucrose triggers colonization of PGPM (plant growth-promoting microbes) in the rhizosphere, but their interactions on the plant remain largely unknown. Here, we applied three concentrations of both Bacillus amyloliquefaciens EZ99 inoculant (1.0 × 105, 1.0 × 106, and 1.0 × 107 colony-forming units (CFU)/mL, denoted as LB, MB, and HB, respectively) and sucrose (0.15, 1.5, and 15 g/L, denoted as LS, MS, and HS, respectively) to investigate their co-effects on R. palmatum in a field experiment. The results showed that LB + MS (1.0 × 105 CFU/mL Bacillus + 1.5 g/L sucrose) and LB + LS (1.0 × 105 CFU/mL Bacillus + 0.15 g/L sucrose) treatments significantly increased root fresh weight (p ≤ 0.05). Metabolite analysis revealed that the treatment LB + LS significantly increased the relative content of major active components in rhubarb, namely anthraquinones and phenolic compounds, by 1.5% and 2.3%. Although high sucrose addition increased the activities of certain soil enzymes, the LB + LS treatment significantly increased total potassium (TK), whereas it decreased available potassium (AK), which facilitated the potassium utilization in rhizosphere soil. Furthermore, rhizosphere microbiomes revealed that fungal diversity was augmented in LB + LS treatment, in which the common causative fungal pathogen Fusarium spp. showed an effective suppression. Additionally, the redundancy analysis and Spearman correlations revealed a positive relationship of Sphingomonas associated with change in potassium bioavailability. Altogether, our findings suggest that the combined application of a bacterial inoculant and sucrose can improve the growth and quality of R. palmatum, and stimulate uptake of plant nutrients that contribute to alter the microbial community for biocontrol potential. Hence, this work not only has broad application prospects across economical plants, but also emphasizes agroecological practices for sustainable agriculture.

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Role of Plant Growth-Promoting Rhizobacteria (PGPR) for Crop Stress Management

Cited by 18 publications

References 113 publications

Isolation, Purification and Application of Siderophore Producing Bacteria to Improve Wheat Growth

Isolation, Purification and Application of Siderophore Producing Bacteria to Improve Wheat Growth

Organic Amendments for Mitigation of Salinity Stress in Plants: A Review

Bacterial Inoculant and Sucrose Amendments Improve the Growth of Rheum palmatum L. by Reprograming Its Metabolite Composition and Altering Its Soil Microbial Community

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