A New Frontier for Biological Control against Plant Pathogenic Nematodes and Insect Pests I: By Microbes

Lee, Hae Ran; Jung, Jihye; Riu, Myoungjoo; ChoongMin, Ryu

doi:10.5423/rpd.2017.23.2.114

Cited by 6 publications

(5 citation statements)

References 271 publications

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“…In pathogens, the Gac sensor kinase system controls virulence gene expression (Heeb and Haas, 2001). It is also found that the Gac/Rsm system of PcO6 is required for the expression of the insecticidal activity to the tobacco hornworm (Rangel et al, 2016), and to the root knot nematode (Lee et al, 2011(Lee et al, , 2017. In addition, the Gac system is shown to be important in expression of gene expression in the inhibition of fungal growth by PcO6 Oh et al, 2013a;Park et al, 2011).…”

Section: Gac/rsm System a Master Switch For Global Regulationmentioning

confidence: 99%

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The Gac/Rsm Signaling Pathway of a Biocontrol Bacterium, Pseudomonas chlororaphis O6

Anderson

Kang

Kim

2017

Research in Plant Disease

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Pseudomonas chlororaphis O6, isolated from the roots of dryland, field-grown commercial wheat in the USA, enhances plant health and therefore it is used in agriculture as a biofertilizer and biocontrol agent. The metabolites produced by this pseudomonad stimulate plant growth through direct antagonism of pathogens and by inducing systemic resistance in the plant. Studies upon P. chlororaphis O6 identify the pathways through which defined bacterial metabolites generate protection against pathogenic microbes, insects, and nematodes. P. chlororaphis O6 also triggers plant resistance to drought and salinity stresses. The beneficial determinants are produced from bacterial cells as they form biofilms during root colonization. Molecular control these processes in P. chlororaphis O6 involves the global regulatory Gac/Rsm signaling cascade with cross-talk between other global regulatory pathways. The Gac/Rsm regulon allows for coordinate phasing of expression of the genes that encode these beneficial traits among a community of cells. This review provides insights on the Gac/Rsm regulon in expression of beneficial traits of the P. chlororaphis O6 which can contribute to help yield enhancement and quality in agricultural production.

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Section: Gac/rsm System a Master Switch For Global Regulationmentioning

confidence: 99%

“…PcO6 also induces systemic resistance to bacterial and fungal pathogens Spencer et al, 2003), nematodes (Lee et al, 2011(Lee et al, , 2017, and viruses (Ryu et al, 2007) as illustrated in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

The Gac/Rsm Signaling Pathway of a Biocontrol Bacterium, Pseudomonas chlororaphis O6

Anderson

Kang

Kim

2017

Research in Plant Disease

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“… Jang et al (2016) also showed that a culture filtrate of Aspergillus niger F22 was highly active against a root-knot nematode Meloidogyne incognita by which a nematicidal component oxalic acid affected the mortality of second-stage juveniles and the inhibition of egg hatching. Later, the strain A. niger F22 was registered as a natural nematicidal agent in the Korean market ( Lee et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Biocontrol Potential of Aspergillus Species Producing Antimicrobial Metabolites

et al. 2021

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Microbial metabolites have been recognized as an important source for the discovery of new antifungal agents because of their diverse chemical structures with novel modes of action. In the course of our screening for new antifungal agents from microbes, we found that culture filtrates of two fungal species Aspergillus candidus SFC20200425-M11 and Aspergillus montenegroi SFC20200425-M27 have the potentials to reduce the development of fungal plant diseases such as tomato late blight and wheat leaf rust. From these two Aspergillus spp., we isolated a total of seven active compounds, including two new compounds (4 and 6), and identified their chemical structures based on the NMR spectral analyses: sphaeropsidin A (1), (R)-formosusin A (2), (R)-variotin (3), candidusin (4), asperlin (5), montenegrol (6), and protulactone A (7). Based on the results of the in vitro bioassays of 11 plant pathogenic fungi and bacteria, sphaeropsidin A (1), (R)-formosusin A (2), (R)-variotin (3), and asperlin (5) exhibited a wide range of antimicrobial activity. Furthermore, when plants were treated with sphaeropsidin A (1) and (R)-formosusin A (2) at a concentration of 500 μg/ml, sphaeropsidin A (1) exhibited an efficacy disease control value of 96 and 90% compared to non-treated control against tomato late blight and wheat leaf rust, and (R)-formosusin A (2) strongly reduced the development of tomato gray mold by 82%. Asperlin (5) at a concentration of 500 μg/ml effectively controlled the development of tomato late blight and wheat leaf rust with a disease control value of 95%. Given that culture filtrates and active compounds derived from two Aspergillus spp. exhibited disease control efficacies, our results suggest that the Aspergillus-produced antifungal compounds could be useful for the development of new natural fungicides.

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“…Many PGPF strains have reported to play important role in plant disease management viz, Aspergillus sp. reduce pathogenicity of plant root knot nematode Meloidogyne incognita (8). Apart from that, PGPF stimulate plant growth by secreting secondary metabolites like hydrogen cyanide, ammonia and plant hormones, mainly indole-3-acetic acid (IAA) (9).…”

Section: Introductionmentioning

confidence: 99%

Characterization of a potent plant growth promoting fungal strain Aspergillus fumigatus MCC 1721 with special reference to indole-3-acetic acid production

Mukherjee¹,

Roy

Parvin

et al. 2022

Plant Sci. Today

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In the present study, indole-3-acetic acid (IAA) producing plant growth promoting fungus was isolated from rice field of Purba Bardhaman district, West Bengal, India. Among the isolated 6 strains, AP2 (Aspergillus fumigatus) was selected as best-performing plant growth promoting fungal strain as it was an efficient indole-3-acetic acid producer as well as exhibits different plant growth promoting ability viz, phosphate solubilization, siderophore production, ammonia and hydrogen cyanide production etc. Media and different growth conditions (pH, temperature, concentration of sodium chloride) were optimized for augmentation of the indole-3-acetic acid production. The genus of the selected isolate AP2 was identified as Aspergillus fumigatus both by 18S rDNA sequence-based homology and MALDI-TOF analyses of ribosomal protein. Plant growth promoting ability of Aspergillus fumigatus has been confirmed by measuring different morphological and biochemical growth parameters in Trigonella foenum-graecum L. So, AP2 (Aspergillus fumigatus) can be considered as novel plant growth promoting fungal strain that can be applied as bio-inoculants on agricultural field.

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A New Frontier for Biological Control against Plant Pathogenic Nematodes and Insect Pests I: By Microbes

Cited by 6 publications

References 271 publications

The Gac/Rsm Signaling Pathway of a Biocontrol Bacterium, Pseudomonas chlororaphis O6

The Gac/Rsm Signaling Pathway of a Biocontrol Bacterium, Pseudomonas chlororaphis O6

Biocontrol Potential of Aspergillus Species Producing Antimicrobial Metabolites

Characterization of a potent plant growth promoting fungal strain Aspergillus fumigatus MCC 1721 with special reference to indole-3-acetic acid production

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