Plants-nematodes-microbes crosstalk within soil: A trade-off among friends or foes

Khanna, Kanika; Kohli, Sukhmeen Kaur; Ohri, Puja; Bhardwaj, Renu

doi:10.1016/j.micres.2021.126755

Cited by 32 publications

(14 citation statements)

References 215 publications

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“…Although a variety of RKN-pathogenic substances have been identified both intracellularly and extracellularly from different nematicidal bacteria [45,46], the current study mainly focused on the screening of RKN-killing substances from the extracellularly secretory metabolites of bacterial cultures, which are mainly based on the following considerations: (1) Currently, a variety of bacterial extracellular secretory nematicidal substances with application potential have been successfully characterized. Considering the simplification of the posttreatment process for formulation development and the saving of production costs, these extracellular active substances appear to be significantly attractive.…”

Section: Discussionmentioning

confidence: 99%

“…Various Pseudomonas strains have been characterized for their ability to produce many functional secondary metabolites, including siderophores, cyclolipopeptides (CLPs), hydrogen cyanide, 2,4-diacetylphloroglucinol (DAPG), phenazine (PHZ), quinolones, and gluconic acid [50,51], and have been identified to have pathogenic or direct killing activity toward different RKNs among these secondary metabolites [45,46]. The M. incognita-toxic substance identified in the current study, 2-ethylhexan-1-ol, is a conventional basic chemical material that particularly serves as an important raw material for synthesizing esters or natural esters in the chemical engineering field.…”

Section: Discussionmentioning

confidence: 99%

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Characterization of Nematicidal Activity and Nematode-Toxic Metabolites of a Soilborne Brevundimonas bullata Isolate

Ding

Sun

et al. 2022

Pathogens

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The increasing prevalence of crop-threatening root-knot nematodes (RKNs) has stimulated extensive research to discover effective nematicides. A highly focused strategy for accomplishing this is the development of biocontrol agents by a variety of soilborne microorganisms, as different bacterial metabolites have demonstrated promising nematicidal activities. In this study, we characterized the nematicidal and suppressive activity of a bacterial isolate against the agriculturally important RKN Meloidogyne incognita and the model nematode Caenorhabditis elegans, and the main M. incognita-toxic metabolite of the strain. After a preliminary screening of 22 bacterial isolates with a corrected mortality (CM) of whole-cell culture greater than 50% against C. elegans from different RKN-incident soils in China, a total of 14 isolates with CM of the supernatant of culture suspension (SCS) higher than 50% against both M. incognita and C. elegans were rescreened. An isolate with the highest CM of 86.1% and 95.0% for M. incognita and C. elegans, respectively, was further identified as the species Brevundimonas bullata via morphological examination, physiological and biochemical assays and alignment analysis of 16S rRNA gene sequences. The SCS of this strain, namely, B. bullata MB756, exhibited synchronous M. incognita killing activity along with significant detrimental effects on the growth, brood size, and locomotion of C. elegans. The effects of heat treatment, pH, inoculations, and protease K proteolysis on the CM of MB756 SCS were evaluated. A major M. incognita-toxic substance in the MB756 SCS was assayed and identified using thin-layer chromatography, column chromatography and high-performance liquid chromatography with a mass spectrometer, and it was preliminarily identified as 2-ethylhexan-1-ol, with a molecular formula of C8H18O and a molecular weight of 130.3 Da.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Characterization of Nematicidal Activity and Nematode-Toxic Metabolites of a Soilborne Brevundimonas bullata Isolate

Ding

Sun

et al. 2022

Pathogens

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“…Antagonistic microorganisms can induce resistance and biopriming in plants, thus providing systemic resistance against a broad spectrum of plant pathogens [115]. Biotic and abiotic diseases, and in some instances even damage caused by insects and nematodes, can be reduced in plants pre-stimulated with the application of non-pathogenic microorganisms (priming) [211][212][213][214][215]. Plant defences can be induced by pathogenic and nonpathogenic microorganisms as pathogen-associated or microbe-associated molecular patterns (PAMPs or MAMPs), or with certain natural or synthetic chemical compounds [216].…”

Section: Induced Resistancementioning

confidence: 99%

Advances and Perspectives in the Use of Biocontrol Agents against Fungal Plant Diseases

et al. 2022

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The use of synthetic fungicides to control fungal diseases has growing limitations due to eco-toxicological risks. Therefore, it is necessary to replace or integrate high risk chemicals with safer tools for human health and environment. Consequently, research on the selection, evaluation, characterization, and use of biocontrol agents (BCAs) has consistently increased in the last decades. BCA formulates, particularly in some countries, are still scarce in coping with the growing demand for their use in sustainable agricultural management. To foster development and utilization of new effective bioformulates, there is a need to optimize BCA activity, to share knowledge on their formulation processes and to simplify the registration procedures. Studies based on new molecular tools can significantly contribute to achieve such objectives. The present review provides the state of the art on biocontrol of fungal plant diseases with special emphasis on (i) features of the most studied BCAs; (ii) key strategies to optimize selection and use of BCAs (iii); mechanisms of action of the main BCAs; (iv) molecular tools and metagenomic studies in the selection and use of BCAs; (v) main issues and constraints in the registration and commercialization of BCAs, and (vi) perspectives in the biocontrol of fungal plant diseases.

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“…The herbivore behavior of RKN has given two good options that can be carried out with crop rotation and change farming methods [23]. In plasticulture systems, control measures such as rotations to non-host crops are restricted because two or more crops vegetables are frequently produced each year on the same land, limiting cycles of rotation.…”

Section: Management Of Plant Parasite Root-knot Nematode Through Crop...mentioning

confidence: 99%

Perspective Chapter: Integrated Root-Knot Nematodes (Meloidogyne) Management Approaches

Ahmad¹,

Khan²,

Ullah³

2022

Parasitic Helminths and Zoonoses - From Basic to Applied Research

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Meloidogyne genus contains the most prevalent and harmful worms formally known as root-knot nematode species. They attack a wide range of plants belonging to different plant families. The infective second stage juveniles (J-II) feed on the roots and as a result, the host plant roots become swollen/produce galls. The attack plant shows stunted growth and in extreme cases, the death of the plant occurs. An integrated pest management (IPM) approach is required to tackle these harmful nematodes spp. The integrated tactics include cultural/agronomic practices, biological and chemical control. A sole management method is not enough to deal with the root-knot nematode. Therefore, a proper IPM package is required for the farmer to gain good health for the crops.

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Plants-nematodes-microbes crosstalk within soil: A trade-off among friends or foes

Cited by 32 publications

References 215 publications

Characterization of Nematicidal Activity and Nematode-Toxic Metabolites of a Soilborne Brevundimonas bullata Isolate

Characterization of Nematicidal Activity and Nematode-Toxic Metabolites of a Soilborne Brevundimonas bullata Isolate

Advances and Perspectives in the Use of Biocontrol Agents against Fungal Plant Diseases

Perspective Chapter: Integrated Root-Knot Nematodes (Meloidogyne) Management Approaches

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