Plant-Growth-Promoting Rhizobacteria (PGPR) and Medicinal Plants

Egamberdieva, Dilfuza; Shrivastava, Smriti; Varma, Ajit

doi:10.1007/978-3-319-13401-7

Cited by 36 publications

(3 citation statements)

References 542 publications

(724 reference statements)

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“…Sequentially, another study also showed ~1.5-fold augmentation in bacoside A production in Bacopa monnieri (L.) Pennell inoculated with chitinolytic microbes as of alteration in the biosynthetic pathway of bacoside A ( Gupta et al., 2017 ). In addition, it was hypothesized that the observed increase in EO and secondary metabolite production might be linked to elicitors (PGRs and other biologically active chemicals) produced by biostimulants, which eventually stimulated the secondary metabolite synthesis via an induced systemic resistance (ISR) mechanism, leading to activation of the host plant’s chemical defense cascades like jasmonic acid (JA) and ethylene (ETH), as many studies have successfully demonstrated the occurrence of ISR in MAPs after biostimulation ( Egamberdieva et al., 2015 ; Chamkhi et al., 2021 ).…”

Section: Discussionmentioning

confidence: 99%

Cleaner production technologies for the amelioration of soil health, biomass and secondary metabolites in Ocimum basilicum L. under Indian Western Himalaya

et al. 2022

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Ocimum basilicum L. and its derived products are primarily consumed by humans; hence, agrochemical use seems inappropriate for its cultivation. However, farmers are accustomed to using rampant inorganic fertilizers to augment crop productivity, which has unintendedly engendered severe environmental perturbations. Concomitantly, farmers will soon have to confront the challenges of growing crops under suboptimal conditions driven by global climate change. Consequently, to develop a clean, sustainable, and resilient production technology, field experiments spanning over two years (2020 and 2021) were conducted, comprising three biostimulants, viz., vermicompost (0, 4, and 8 Mg ha−1), biofertilizer (uninoculated and inoculated), and liquid seaweed extract (without and at 7 ml L−1) in the Indian western Himalaya for the first time. Soil health indicators, leaf photosynthetic pigments, gaseous exchange, mineral contents, essential oil (EO) quantity, and composition were evaluated. Soil microbial respiration (SMR), microbial biomass carbon (MBC), organic carbon (OC), dehydrogenase (DHA), alkaline phosphatase (ALP), and β-glucosidase activities were increased by 36.23, 83.98, 30.61, 42.69, 34.00, and 40.57%, respectively, when compared with the initial soil status. The net photosynthetic rate (Pn) was significantly increased with the highest (8 Mg ha−1) and moderate (4 Mg ha−1) vermicompost dosages by 13.96% and 4.56%, respectively, as compared with the unfertilized control (0 Mg ha−1). Likewise, the biofertilizer and seaweed extract also enhanced Pn by 15.09% and 10.09%, respectively. The crop’s key EO constituents, viz., methyl chavicol and linalool, were significantly improved with the highest and moderate vermicompost rates of 2.71, 9.85%, and 1.18, 5.03%, respectively. Similarly, biofertilization and seaweed application also boosted methyl chavicol and linalool by 3.29, 8.67%, and 1.93, 3.66%, respectively. In both years, significantly higher herbage (8.86 and 11.25 Mg ha−1) and EO yield (113.78 and 154.87 kg ha−1) were recorded with a congregate treatment of the highest vermicompost dose, biofertilizer, and liquid seaweed extract. In conclusion, the integrated use of biostimulants having complementary properties can sustainably maximize the quantity and quality of O. basilicum and concomitantly ameliorate soil health. This study can inspire scientific communities and industries to develop second-generation biostimulant products, delivering better sustainability and resilience for a renaissance in agriculture.

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Section: Discussionmentioning

confidence: 99%

Cleaner production technologies for the amelioration of soil health, biomass and secondary metabolites in Ocimum basilicum L. under Indian Western Himalaya

et al. 2022

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“…Other bacteria of the genus Enterobacter spp. and Klebsiella also presents the potential of production of volatile organic compounds such as acetoin, involved in the induction of resistance against phytopathogens (HUNGRIA; ARAÚJO, 1994;RUDRAPPA et al, 2010;EGAMBERDIEVA et al, 2015). Pérez-Portuondo et al (2017) verified that the production of acetoin by isolates of rhizosphere bacteria; it was demonstrated that the presence of this compound is involved in the induction of plant resistance.…”

Section: Introductionmentioning

confidence: 98%

Acetoine and chitinase productionby native rizobacteria from Western Paraná

et al. 2020

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The objective of this study was to investigate28 strains of nativerhizobacteriafrom the west region of Paraná, evaluating the acetoin and chitinase production capacity, because of their roleinbiocontrol. Thebacteriaisolates were submitted to the modified Voges-Proskauer (VP) assayin Clark & Lubs liquid medium forglucose fermentation. Metaboliteproductionwasevaluated in a spectrophotometer,and it showed a wide variation in concentrations (0,476to1,865) for differentisolates.Strains 241, 320, 326, and 273showedhighervaluesthan the others tested. According to positive results in the qualitative test of VP, 11 isolates were chosen for the tests in minimal medium containing chitin as the only source of carbon. Isolates that presented the degradation halo formation were considered as chitinolytic bacteria, evidencing chitinaseactivity. Among these strains, two belonged tothe genus Bacillusspp. (56 and 121) and two tothe genus Enterobacterspp. (292 and 151). Therefore, the present work was able to identify native strains with potential for biocontrol studies allowing tocontinue investigations of other metabolitesproducedby thosebacteria in this collection regarding plant protection.

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“…PGPR not only fosters a more balanced and resilient ecosystem within the soil but also improves nutrient availability, enhances stress tolerance in plants, and increases crop productivity [2]. It contributes to the growth, development, and overall health of plants through various mechanisms such as nitrogen fixation, nutrient solubilization, and disease suppression [3]. Some of the PGPRs such as Azobacter, Azosprillum, Bacillus, Enterobacter, Klebsiella, Pseudomonas, Variovorax, and Serratiaare play important roles in the agricultural field [4].…”

Section: Introductionmentioning

confidence: 99%

Plant Growth-Promoting Rhizobacteria (PGPR): A Potential Alternative Tool for Sustainable Agriculture

Ghosh,

Acharya,

Shaw

et al. 2024

Updates on Rhizobacteria

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Soil is an important natural resource that nurtures living microbial communities and improves plant productivity, thus ensuring food security. The chemical fertilizers used during the last few decades though improved plant productivity so rapidly; however, it is indiscriminate use results in poor soil health and less agricultural productivity, affecting food security and human health worldwide. There is an urgent need of biological agents, such as plant growth-promoting rhizobacteria (PGPR), which may serve as better alternative to solve this problem. PGPR plays an important role to increase soil fertility, plant growth promotion, and suppression of phytopathogens for the development of eco-friendly sustainable agriculture. The present study provides a critical overview on PGPR, its mechanism and function, and significance as a potential alternative tool for sustainable agriculture. An attempt has been made to propose an eco-friendly model integrating PGPR with various sectors, such as human health, agriculture, and food industry for its effective commercialization. The study might be helpful to identify the prospects and challenges of PGPR to fully integrate them into sustainable agriculture practices.

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Plant-Growth-Promoting Rhizobacteria (PGPR) and Medicinal Plants

Cited by 36 publications

References 542 publications

Cleaner production technologies for the amelioration of soil health, biomass and secondary metabolites in Ocimum basilicum L. under Indian Western Himalaya

Cleaner production technologies for the amelioration of soil health, biomass and secondary metabolites in Ocimum basilicum L. under Indian Western Himalaya

Acetoine and chitinase productionby native rizobacteria from Western Paraná

Plant Growth-Promoting Rhizobacteria (PGPR): A Potential Alternative Tool for Sustainable Agriculture

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