Effect of Plant Growth Promoting Rhizobacteria (PGPR) on Increasing the Activity of Defense Enzymes in Tomato Plants

Joni, Fadhila Rahmi; Hamid, Hasmiandy; Yanti, Yulmira

doi:10.22161/ijeab.56.9

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…Rhizobacteria induce systemic resistance by activation of various defense related enzymes peroxidase (PO) and polyphenol oxidase (PPO). Increased activity of PO or PPO has been elicited by biocontrol agent strains in different plants (Govindappa et al, 2010;Nogueira de Moura Guerra et al, 2013;Joni et al, 2020). Research work has reported that the bio-agents P. fluorescens and Bacillus species might stimulate the production of biochemical compounds associated with the host defense (Kavino et al, 2007;Raj et al, 2016;Rais et al, 2017).…”

Section: Discussiᴏnmentioning

confidence: 99%

Mᴏlecular Characterizatiᴏn and Nematicidal Activity ᴏf sᴏme Sᴏil Bacteria against Rᴏᴏt-knᴏt Nematᴏdem, Meloidogyne javanica in Strawberry

Ibrahim¹,

Wahdan²,

El-Shishtawy

et al. 2023

Journal of Plant Protection and Pathology

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Melᴏidᴏgyne species are the highest eradicative pest in most of yields causing huge lᴏsses in many crᴏps. The use ᴏf rhizᴏbacteria has gained attentiᴏn in the cᴏntrᴏl of Meloidogyne javanica. In ᴏur study, five rhizᴏbacteria were isᴏlated frᴏm sandy lᴏamy sᴏil samples in El Beheira gᴏvernᴏrate, and identified based ᴏn their mᴏlecular characteristics (16S rRNA sequences) and phylᴏgenetic analysis. The selected isᴏlates were Staphylᴏcᴏccus pasteuri, Pseudᴏmᴏnas japᴏnica, Bacillus cereus, B. altitudinis and B. safensis. The five bacterial strains exhibited satisfactᴏry nematicidal activity against M. javanica in vitro. Under field condition, the applied bacterial strains significantly increased the plant grᴏwth parameters and suppressed M. javanica reprᴏductive factᴏr but at different rates. Hᴏwever, P. japᴏnica shᴏwed the best results as significantly suppressed rᴏᴏt galling up tᴏ 63.73 tᴏ 82.08% during 2019 and 2020, respectively. As a result ᴏf the significant impact ᴏf the strain S. pasteuri DAM10, it cᴏuld be utilized as a biᴏcᴏntrᴏl factᴏr against rᴏᴏt-knᴏt diseases caused by M. javanica, and has nᴏt been previᴏusly repᴏrted yet. Therefᴏre, after further studies screened strains can be used as ᴏne ᴏf the biᴏlᴏgical cᴏntrᴏl agents that lead tᴏ imprᴏving plant grᴏwth and reducing nematᴏde infectiᴏn and thus reducing the use ᴏf chemical nematicides and helping tᴏ develᴏp safer sustainable agriculture.

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Section: Discussiᴏnmentioning

confidence: 99%

Mᴏlecular Characterizatiᴏn and Nematicidal Activity ᴏf sᴏme Sᴏil Bacteria against Rᴏᴏt-knᴏt Nematᴏdem, Meloidogyne javanica in Strawberry

Ibrahim¹,

Wahdan²,

El-Shishtawy

et al. 2023

Journal of Plant Protection and Pathology

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“…secreted multiple biocontrol determinants such as glucanase (1.0-1.3 U/mg of soil), protease (1.1-5.5 U/mg of soil), siderophores (6.5-42.8 µg/mL) in rhizosphere of rice varieties thus alleviating P. oryzae induced oxidative damage and suppressing blast disease incidence. Application of PGPR strains especially fluorescent Pseudomonads in horticultural crops such as tomato, chilli and banana expressed increased activity of PPO and its isoforms, when challenged by viruses such as Tomato spotted wilt virus, Cucumber mosaic virus and Banana bunchy top virus (Joni et al, 2020).…”

Section: Polyphenol Oxidase (Ppo)mentioning

confidence: 99%

Plant growth-promoting rhizobacteria (PGPR) and its mechanisms against plant diseases for sustainable agriculture and better productivity

Dutta¹,

MUTHUKRISHNAN²,

GOPALASUBRAMAIAM³

et al. 2022

Biocell

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Plant growth-promoting rhizobacteria (PGPR) are specialized bacterial communities inhabiting the root rhizosphere and the secretion of root exudates helps to, regulate the microbial dynamics and their interactions with the plants. These bacteria viz., Agrobacterium, Arthobacter, Azospirillum, Bacillus, Burkholderia, Flavobacterium, Pseudomonas, Rhizobium, etc., play important role in plant growth promotion. In addition, such symbiotic associations of PGPRs in the rhizospheric region also confer protection against several diseases caused by bacterial, fungal and viral pathogens. The biocontrol mechanism utilized by PGPR includes direct and indirect mechanisms direct PGPR mechanisms include the production of antibiotic, siderophore, and hydrolytic enzymes, competition for space and nutrients, and quorum sensing whereas, indirect mechanisms include rhizomicrobiome regulation via. secretion of root exudates, phytostimulation through the release of phytohormones viz., auxin, cytokinin, gibberellic acid, 1-aminocyclopropane-1-carboxylate and induction of systemic resistance through expression of antioxidant defense enzymes viz., phenylalanine ammonia lyase (PAL), peroxidase (PO), polyphenyloxidases (PPO), superoxide dismutase (SOD), chitinase and β-glucanases. For the suppression of plant diseases potent bio inoculants can be developed by modulating the rhizomicrobiome through rhizospheric engineering. In addition, understandings of different strategies to improve PGPR strains, their competence, colonization efficiency, persistence and its future implications should also be taken into consideration.

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“…Peroxidase leads to the polymerization of phenolic compounds into lignin-like substances, impeding pathogen growth 34 . Polyphenol oxidase catalyzes phenolic compounds into antimicrobial quinones, playing a vital role in plant defense 35 . Phenylalanine ammonia lyase connects primary and secondary metabolism, catalyzing the synthesis of phenolic compounds crucial for resistance against pathogens 36 .…”

Section: Introductionmentioning

confidence: 99%

Antagonistic potential and biological control mechanisms of Pseudomonas strains against banded leaf and sheath blight disease of maize

Sahgal,

Saini,

Jaggi

et al. 2024

Sci Rep

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Rhizoctonia solani, the causal agent of banded leaf and sheath blight (BL&SB), poses a significant threat to maize and various crops globally. The increasing concerns surrounding the environmental and health impacts of chemical fungicides have encouraged intensified concern in the development of biological control agents (BCAs) as eco-friendly alternatives. In this study, we explored the potential of 22 rhizobacteria strains (AS1–AS22) isolates, recovered from the grasslands of the Pithoragarh region in the Central Himalayas, as effective BCAs against BL&SB disease. Among these strains, two Pseudomonas isolates, AS19 and AS21, exhibited pronounced inhibition of fungal mycelium growth in vitro, with respective inhibition rates of 57.04% and 54.15% in cell cultures and 66.56% and 65.60% in cell-free culture filtrates. Additionally, both strains demonstrated effective suppression of sclerotium growth. The strains AS19 and AS21 were identified as Pseudomonas sp. by 16S rDNA phylogeny and deposited under accession numbers NAIMCC-B-02303 and NAIMCC-B-02304, respectively. Further investigations revealed the mechanisms of action of AS19 and AS21, demonstrating their ability to induce systemic resistance (ISR) and exhibit broad-spectrum antifungal activity against Alternaria triticina, Bipolaris sorokiniana, Rhizoctonia maydis, and Fusarium oxysporum f. sp. lentis. Pot trials demonstrated significant reductions in BL&SB disease incidence (DI) following foliar applications of AS19 and AS21, with reductions ranging from 25 to 38.33% compared to control treatments. Scanning electron microscopy revealed substantial degradation of fungal mycelium by the strains, accompanied by the production of hydrolytic enzymes. These findings suggest the potential of Pseudomonas strains AS19 and AS21 as promising BCAs against BL&SB and other fungal pathogens. However, further field trials are warranted to validate their efficacy under natural conditions and elucidate the specific bacterial metabolites responsible for inducing systemic resistance. This study contributes to the advancement of sustainable disease management strategies and emphasizes the potential of Pseudomonas strains AS19 and AS21 in combating BL&SB and other fungal diseases affecting agricultural crops.

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Effect of Plant Growth Promoting Rhizobacteria (PGPR) on Increasing the Activity of Defense Enzymes in Tomato Plants

Cited by 4 publications

References 10 publications

Mᴏlecular Characterizatiᴏn and Nematicidal Activity ᴏf sᴏme Sᴏil Bacteria against Rᴏᴏt-knᴏt Nematᴏdem, Meloidogyne javanica in Strawberry

Mᴏlecular Characterizatiᴏn and Nematicidal Activity ᴏf sᴏme Sᴏil Bacteria against Rᴏᴏt-knᴏt Nematᴏdem, Meloidogyne javanica in Strawberry

Plant growth-promoting rhizobacteria (PGPR) and its mechanisms against plant diseases for sustainable agriculture and better productivity

Antagonistic potential and biological control mechanisms of Pseudomonas strains against banded leaf and sheath blight disease of maize

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