PGPR Bioelicitors

Kannojia, Pooja; Choudhary, Krishna Kumar; Srivastava, Akhileshwar Kumar; Singh, Amit

doi:10.1016/b978-0-12-815879-1.00004-5

Cited by 40 publications

(13 citation statements)

References 86 publications

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“…However, Gram-positive bacteria, and among them, those of the genus Bacillus, have gained much importance in the last decade because of the great potential to trigger resistance mechanisms against a wide range of pathogens (Kannojia et al 2018, Gutierrez Albanchez et al 2018.…”

Section: Discussionmentioning

confidence: 99%

Bioeffectors as biotechnological tools of the innate immunity: signal transduction pathways involved

Martin‐Rivilla

García‐Villaraco

Ramos‐Solano

et al. 2020

Preprint

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Background Unravel the complex functioning of plant immune system is essential and something in which great effort is being made since its performance is not entirely clear yet. Knowing plant immune system allows strengthening it and therefore developing a more efficient and environmentally friendly agriculture, avoiding the massive use of agrochemicals and making plants the main protagonist in the defense against pathogens.The use of beneficial rhizobacteria (bioeffectors) and its derived metabolic elicitors are biotechnological alternatives in plant immune system elicitation. The present work aimed to check the ability of 25 bacterial strains selected from a group of 175, isolated from the rhizosphere of Nicotiana glauca, to trigger the innate immune system of Arabidopsis thaliana seedlings against the pathogen Pseudomonas syringae DC3000. A study of the signal transduction pathways involved in plant response was made.Results The selected 25 strains were chosen because of their biochemical traits and avoiding phylogenetic redundancy. The 5 strains, of the previous 25, more effective in the prevention of pathogen infection were used to elucidate signal transduction pathways involved in the plant immune response, studying the differential expression of Salicylic acid and Jasmonic acid/Ethylene pathway marker genes. Some strains stimulated the two pathways with no inhibitory effects between them, while others stimulated either one or the other. Metabolic elicitors of two strains, chosen for their taxonomic affiliation and for the results obtained in the differential expression of the genes studied, were extracted using n-hexane, ethyl acetate and n-butanol, and their capacity to mimic bacterial effect to trigger the immune system of the plant was studied. N-hexane and ethyl acetate were the most effective fractions against the pathogen in both strains, achieving similar protection rates although gene expression responses were different from that obtained by the bacteria. Conclusions Beneficial rhizobacteria and its metabolic elicitors have great potential as biotechnological tools since they are able to improve plant immune system through the triggering of either Salicylic acid or Jasmonic acid/Ethylene pathway or both pathways simultaneously. These results open a huge amount of biotechnological possibilities to develop biological products for agriculture in different situations and plant species.

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Section: Discussionmentioning

confidence: 99%

Bioeffectors as biotechnological tools of the innate immunity: signal transduction pathways involved

Martin‐Rivilla

García‐Villaraco

Ramos‐Solano

et al. 2020

Preprint

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“…However, ethylene plays an important role in rhizobacteria mediated ISR ( Singh et al, 2022 ). A wide range of microbes use the strategy of biocontrol agents that trigger ISR in plants, confirmed their ability to initiate or enhance in the production of plant defense enzymes such as; polyphenol oxidase (PPO), peroxidase and phenylalanine ammonia lyase ( Kannojia et al, 2019 ; Antar et al, 2021 ; Santoyo et al, 2021 ). Several studies on molecular mechanisms revealed that PGPR can be used against several pathogens to induce priming of volatile compound without using Npr1 (SA insensitive or non-expresser of PR) gene but the expression of ET signaling is required ( Tyagi et al, 2018 ; Panpatte et al, 2020 ; Abbasi et al, 2021 ).…”

Section: Plant Based Management Approaches To Control Potato Stem Rot...mentioning

confidence: 96%

Neocosmospora rubicola, a stem rot disease in potato: Characterization, distribution and management

Riaz

Akhtar²,

Msimbira³

et al. 2022

Front. Microbiol.

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Potato (Solanum tuberosum L.) is one of the most important crops in maintaining global food security. Plant stand and yield are affected by production technology, climate, soil type, and biotic factors such as insects and diseases. Numerous fungal diseases including Neocosmospora rubicola, causing stem rot, are known to have negative effects on potato growth and yield quality. The pathogen is known to stunt growth and cause leaf yellowing with grayish-black stems. The infectivity of N. rubicola across a number of crops indicates the need to search for appropriate management approaches. Synthetic pesticides application is a major method to mitigate almost all potato diseases at this time. However, these pesticides significantly contribute to environmental damage and continuous use leads to pesticide resistance by pathogens. Consumers interest in organic products have influenced agronomists to shift toward the use of biologicals in controlling most pathogens, including N. rubicola. This review is an initial effort to carefully examine current and alternative approaches to control N. rubicola that are both environmentally safe and ecologically sound. Therefore, this review aims to draw attention to the N. rubicola distribution and symptomatology, and sustainable management strategies for potato stem rot disease. Applications of plant growth promoting bacteria (PGPB) as bioformulations with synthetic fertilizers have the potential to increase the tuber yield in both healthy and N. rubicola infested soils. Phosphorus and nitrogen applications along with the PGPB can improve plants uptake efficiency and reduce infestation of pathogen leading to increased yield. Therefore, to control N. rubicola infestation, with maximum tuber yield benefits, a pre-application of the biofertilizer is shown as a better option, based on the most recent studies. With the current limited information on the disease, precise screening of the available resistant potato cultivars, developing molecular markers for resistance genes against N. rubicola will assist to reduce spread and virulence of the pathogen.

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“…like P. putida and P. fluorescens protect against pathogens in plants like tomato, sugar cane, and oak . ISR induction on plants by PGPR result in substantial modifications in the plants structure and functions that lead to resistance against invading pathogens …”

Section: Indirect Mechanismsmentioning

confidence: 99%

Multifaceted Impacts of Plant-Beneficial Pseudomonas spp. in Managing Various Plant Diseases and Crop Yield Improvement

Mehmood,

Saeed,

Zafarullah

et al. 2023

ACS Omega

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The modern agricultural system has issues with the reduction of agricultural productivity due to a wide range of abiotic and biotic stresses. It is also expected that in the future the entire world population may rapidly increase and will surely demand more food. Farmers now utilize a massive quantity of synthetic fertilizers and pesticides for disease management and to increase food production. These synthetic fertilizers badly affect the environment, the texture of the soil, plant productivity, and human health. However, agricultural safety and sustainability depend on an ecofriendly and inexpensive biological application. In contrast to synthetic fertilizers, soil inoculation with plant-growth-promoting rhizobacteria (PGPR) is one of the excellent alternative options. In this regard, we focused on the best PGPR genera, Pseudomonas, which exists in the rhizosphere as well as inside the plant’s body and plays a role in sustainable agriculture. Many Pseudomonas spp. control plant pathogens and play an effective role in disease management through direct and indirect mechanisms. Pseudomonas spp. fix the amount of atmospheric nitrogen, solubilize phosphorus and potassium, and also produce phytohormones, lytic enzymes, volatile organic compounds, antibiotics, and secondary metabolites during stress conditions. These compounds stimulate plant growth by inducing systemic resistance and by inhibiting the growth of pathogens. Furthermore, pseudomonads also protect plants during different stress conditions like heavy metal pollution, osmosis, temperature, oxidative stress, etc. Now, several Pseudomonas-based commercial biological control products have been promoted and marketed, but there are a few limitations that hinder the development of this technology for extensive usage in agricultural systems. The variability among the members of Pseudomonas spp. draws attention to the huge research interest in this genus. There is a need to explore the potential of native Pseudomonas spp. as biocontrol agents and to use them in biopesticide development to support sustainable agriculture.

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PGPR Bioelicitors

Cited by 40 publications

References 86 publications

Bioeffectors as biotechnological tools of the innate immunity: signal transduction pathways involved

Bioeffectors as biotechnological tools of the innate immunity: signal transduction pathways involved

Neocosmospora rubicola, a stem rot disease in potato: Characterization, distribution and management

Multifaceted Impacts of Plant-Beneficial Pseudomonas spp. in Managing Various Plant Diseases and Crop Yield Improvement

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