Co-inoculation of tomato with an arbuscular mycorrhizal fungus improves plant immunity and reduces root-knot nematode infection

Sharma, Ishwar Prakash; Sharma, Anil Kumar

doi:10.1016/j.rhisph.2017.05.008

Cited by 46 publications

(11 citation statements)

References 22 publications

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“…Mycorrhizae elicit phenolic biosynthesis in other plant species (Baslam and Goicoechea, 2012;Jugran et al, 2015). They also trigger plant defense against abiotic and biotic stresses and improve nutrient availability and use efficiency (Sharma and Sharma, 2017). Phenolics are associated with plant defense mechanisms.…”

Section: Discussionmentioning

confidence: 99%

A Microbial-Based Biostimulant Enhances Sweet Pepper Performance by Metabolic Reprogramming of Phytohormone Profile and Secondary Metabolism

Bonini¹,

Rouphael

Miras-Moreno

et al. 2020

Front. Plant Sci.

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Microbial-based biostimulants can improve crop productivity by modulating cell metabolic pathways including hormonal balance. However, little is known about the microbial-mediated molecular changes causing yield increase. The present study elucidates the metabolomic modulation occurring in pepper (Capsicum annuum L.) leaves at the vegetative and reproductive phenological stages, in response to microbial-based biostimulants. The arbuscular mycorrhizal fungi Rhizoglomus irregularis and Funneliformis mosseae, as well as Trichoderma koningii, were used in this work. The application of endophytic fungi significantly increased total fruit yield by 23.7% compared to that of untreated plants. Multivariate statistics indicated that the biostimulant treatment substantially altered the shape of the metabolic profile of pepper. Compared to the untreated control, the plants treated with microbial biostimulants presented with modified gibberellin, auxin, and cytokinin patterns. The biostimulant treatment also induced secondary metabolism and caused carotenoids, saponins, and phenolic compounds to accumulate in the plants. Differential metabolomic signatures indicated diverse and concerted biochemical responses in the plants following the colonization of their roots by beneficial microorganisms. The above findings demonstrated a clear link between microbial-mediated yield increase and a strong upregulation of hormonal and secondary metabolic pathways associated with growth stimulation and crop defense to environmental stresses.

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Section: Discussionmentioning

confidence: 99%

A Microbial-Based Biostimulant Enhances Sweet Pepper Performance by Metabolic Reprogramming of Phytohormone Profile and Secondary Metabolism

Bonini¹,

Rouphael

Miras-Moreno

et al. 2020

Front. Plant Sci.

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“…Other examples of systemic resistance produced by AMF are a reduced nematode infection, due to the activity of phenolics and defensive plant enzymes, i.e., peroxidase (PO), polyphenol oxidase (PPO), and SOD, together with a significant reduction of malondialdehyde (MDA) and hydrogen peroxide (H 2 O 2 ) content in tomato roots inoculated with R. irregularis, that also enhanced plant growth (Sharma and Sharma, 2017a). Similarly, the application of G. mosseae using a split-root system against the sedentary nematode M. incognita and the migratory nematode P. penetrans, in tomato indicated that the infection by both different types of nematodes can be controlled by AMF, but only systemically (Vos et al, 2012b).…”

Section: Mycorrhizal Fungimentioning

confidence: 99%

Biological Control of Plant-Parasitic Nematodes by Filamentous Fungi Inducers of Resistance: Trichoderma, Mycorrhizal and Endophytic Fungi

2020

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Plant-parasitic-nematodes represent a major threat to the agricultural production of different crops worldwide. Due to the high toxicity of chemical nematicides, it is necessary to develop new control strategies against nematodes. In this respect, filamentous fungi can be an interesting biocontrol alternative. The genus Trichoderma, mycorrhizal and endophytic fungi are the main groups of filamentous fungi studied and used as biological control agents (BCAs) against nematodes as resistance inducers. They are able to reduce the damage caused by plant-parasitic nematodes directly by parasitism, antibiosis, paralysis and by the production of lytic enzymes. But they also minimize harm by space and resource-competition, by providing higher nutrient and water uptake to the plant, or by modifying the root morphology, and/or rhizosphere interactions, that constitutes an advantage for the plant-growth. Besides, filamentous fungi are able to induce resistance against nematodes by activating hormone-mediated (salicylic and jasmonic acid, strigolactones among others) plant-defense mechanisms. Additionally, the alteration of the transport of chemical defense components through the plant or the synthesis of plant secondary metabolites and different enzymes can also contribute to enhancing plant defenses. Therefore, the use of filamentous fungi of the mentioned groups as BCAs is a promising durable biocontrol strategy in agriculture against plant-parasitic nematodes.

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“…The increasing concern about the environmental impact of traditional nematicides have stimulated research for alternative control practices, including the use of biological control organisms. AM fungi have been reported to be effective against different pathogens and pests (Selosse et al, 2014; Martinez-Medina et al, 2016) and could represent a new environmental-friendly strategy to control nematode infection (Elsen et al, 2008; Vos et al, 2012; Schouteden et al, 2015; Sharma and Sharma, 2017).…”

Section: Introductionmentioning

confidence: 99%

Transcriptomic Responses to Water Deficit and Nematode Infection in Mycorrhizal Tomato Roots

et al. 2019

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Climate changes include the intensification of drought in many parts of the world, increasing its frequency, severity and duration. However, under natural conditions, environmental stresses do not occur alone, and, in addition, more stressed plants may become more susceptible to attacks by pests and pathogens. Studies on the impact of the arbuscular mycorrhizal (AM) symbiosis on tomato response to water deficit showed that several drought-responsive genes are differentially regulated in AM-colonized tomato plants (roots and leaves) during water deficit. To date, global changes in mycorrhizal tomato root transcripts under water stress conditions have not been yet investigated. Here, changes in root transcriptome in the presence of an AM fungus, with or without water stress (WS) application, have been evaluated in a commercial tomato cultivar already investigated for the water stress response during AM symbiosis. Since root-knot nematodes (RKNs, Meloidogyne incognita ) are obligate endoparasites and cause severe yield losses in tomato, the impact of the AM fungal colonization on RKN infection at 7 days post-inoculation was also evaluated. Results offer new information about the response to AM symbiosis, highlighting a functional redundancy for several tomato gene families, as well as on the tomato and fungal genes involved in WS response during symbiosis, underlying the role of the AM fungus. Changes in the expression of tomato genes related to nematode infection during AM symbiosis highlight a role of AM colonization in triggering defense responses against RKN in tomato. Overall, new datasets on the tomato response to an abiotic and biotic stress during AM symbiosis have been obtained, providing useful data for further researches.

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Co-inoculation of tomato with an arbuscular mycorrhizal fungus improves plant immunity and reduces root-knot nematode infection

Cited by 46 publications

References 22 publications

A Microbial-Based Biostimulant Enhances Sweet Pepper Performance by Metabolic Reprogramming of Phytohormone Profile and Secondary Metabolism

A Microbial-Based Biostimulant Enhances Sweet Pepper Performance by Metabolic Reprogramming of Phytohormone Profile and Secondary Metabolism

Biological Control of Plant-Parasitic Nematodes by Filamentous Fungi Inducers of Resistance: Trichoderma, Mycorrhizal and Endophytic Fungi

Transcriptomic Responses to Water Deficit and Nematode Infection in Mycorrhizal Tomato Roots

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