Serratia proteamaculans mediated alteration of tomato defense system and growth parameters in response to early blight pathogen Alternaria solani infection

Youssef, Sahar A.; Tartoura, Kamel A. H.; Greash, Alaa G.

doi:10.1016/j.pmpp.2018.04.004

Cited by 11 publications

(6 citation statements)

References 58 publications

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“…Next to the above mentioned bacteria Serratia plymuthica HRO-48 was successfully developed as seed treatment for OSR against Verticillium dahlia 11 and Phoma lingam 41 . To our knowledge, the species Serratia proteamaculans has not yet been reported as a biocontrol agent in OSR, but an isolate of this species controlled Alternaria in tomato 38 . Our strain of S. proteamaculans that was most effective against Sclerotinia in the seedling assay failed in the field, possibly because the seedling assay does not mimic natural infection conditions in OSR closely, where the spread via ascospores germinating on senescent petals is the prevailing infection pathway 6 .…”

Section: Discussionmentioning

confidence: 99%

“…Hardly any isolates effective against P. lingam could be detected in the cotyledon assay, possibly because the employed method of mycelial inoculation is more invasive and creates greater disease pressure than inoculation with pycnidiospores used by other authors 23,65,66 . We used in planta tests with seedlings rather than in vitro assays for the screening of antagonist activity as the latter are not always correlated with in planta performance 36 , and do not detect the mechanism of resistance induction, which is particularly common in the genera Pseudomonas 37 and Serratia 38 . Bacteria of both genera have been shown to be effective against Sclerotinia in OSR previously 39,40 .…”

Section: Discussionmentioning

confidence: 99%

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Bacterial and fungal endophyte communities in healthy and diseased oilseed rape and their potential for biocontrol of Sclerotinia and Phoma disease

Schmidt

Mrnka

Lovecká

et al. 2021

Sci Rep

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Phoma stem canker (caused by the ascomycetes Leptosphaeria maculans and Leptosphaeria biglobosa) is an important disease of oilseed rape. Its effect on endophyte communities in roots and shoots and the potential of endophytes to promote growth and control diseases of oilseed rape (OSR) was investigated. Phoma stem canker had a large effect especially on fungal but also on bacterial endophyte communities. Dominant bacterial genera were Pseudomonas, followed by Enterobacter, Serratia, Stenotrophomonas, Bacillus and Staphylococcus. Achromobacter, Pectobacter and Sphingobacterium were isolated only from diseased plants, though in very small numbers. The fungal genera Cladosporium, Botrytis and Torula were dominant in healthy plants whereas Alternaria, Fusarium and Basidiomycetes (Vishniacozyma, Holtermaniella, Bjerkandera/Thanatephorus) occurred exclusively in diseased plants. Remarkably, Leptosphaeria biglobosa could be isolated in large numbers from shoots of both healthy and diseased plants. Plant growth promoting properties (antioxidative activity, P-solubilisation, production of phytohormones and siderophores) were widespread in OSR endophytes. Although none of the tested bacterial endophytes (Achromobacter, Enterobacter, Pseudomonas, Serratia and Stenotrophomonas) promoted growth of oilseed rape under P-limiting conditions or controlled Phoma disease on oilseed rape cotyledons, they significantly reduced incidence of Sclerotinia disease. In the field, a combined inoculum consisting of Achromobacter piechaudii, two pseudomonads and Stenotrophomonas rhizophila tendencially increased OSR yield and reduced Phoma stem canker.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Bacterial and fungal endophyte communities in healthy and diseased oilseed rape and their potential for biocontrol of Sclerotinia and Phoma disease

Schmidt

Mrnka

Lovecká

et al. 2021

Sci Rep

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“…To combat powdery mildew, these treatments improved the growth parameters of those plants, in addition, a significant increase in chlorophyll content, as a result of their efficiency in reducing the severity of the disease. Also, noted [46], showed that when tomato plants were treated with Serratia proteamaculans, this resulted in a significant increase in chlorophyll content in treated leaves, compared to untreated ones.…”

Section: Discussionmentioning

confidence: 96%

Efficiency of Using Some Biological Organisms as Biological Catalysts to Reduce the Incidence of Cantaloupe Downy Mildew Disease Under Greenhouse Conditions

Khalil¹

2022

AJLS

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Infection of cantaloupe plant with Downy mildew caused by the fungus Pseudoperonospora cubensis leads to significant losses in the amount of the crop, in addition to, reducing its marketing value in many countries around the world, therefore, the efficacy of each of the organisms (Trichoderma harzianum, Trichoderma viride, Bacillus subtilis, Bacillus megaterium and Pseudomonas fluorescens), and the fungicide Ridomil gold plus 71.5 WP for the control of cantaloupe downy mildew under laboratory and greenhouse conditions was studied, initially, under laboratory conditions, the results obtained showed that, when using bio filters, in addition to, the recommended concentration of the fungicide to inhibit the germination of P. cubensis sporangia, a significant reduction in the germination rate of the pathogenic fungus sporangia was observed, also, under greenhouse conditions, treatment of cantaloupe with the tested organisms and with the fungicide significantly reduced the severity of downy mildew, compared to the control treatment, where, the best of these treatments in reducing the severity of the disease was the use of the fungicide, while, the organisms were arranged according to their efficiency in reducing the severity of the disease in the following descending order: B. subtilis, Ba. megaterium, P. fluorescens, T. viride and T. harzianum, In addition, cantaloupe plants showed a significant increase in plant growth parameters, for example, (number of leaves, leaf area and total chlorophyll content), also, an increase in yield components, For example, (number of fruits/plant and fruit weight /plant), the above treatments also increased the activity of defense-related enzymes, for example, peroxidase and polyphenol oxidase enzymes, as well as, total phenol content compared to the control treatment.

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“…In phenazine-producing Pseudomonas, this quorum-sensing mechanism is well understood. Plant growth secreted toxin surface chemicals (bio-surfactants) and volatiles, chitinase cell wall-degrading enzymes, and -1,3glucanase enhancing rhizobacteria to reduce soil-borne pathogens [154][155][156]. The release of siderophore ligands, which efficiently grab iron and inhibit pathogen development, was previously identified as a biocontrol mechanism [157,158].…”

Section: Mechanism Of Antagonistic Bacteriamentioning

confidence: 99%

Mechanism of Antagonistic Bioagents in Controlling Root-Knot Nematodes (Meloidogyne sp.): A Review

Boakye¹,

Anning²,

Li³

et al. 2022

ARJA

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Root-knot nematodes are among the most significant pathogenic organisms due to their global distribution, capacity for destruction, and economic importance. Antagonistic bioagents are more effective alternative to synthetic pesticides in the suppression of root-knot nematodes. Bioagents reduce the use of synthetic chemicals, which are hazardous to both humans and the environment. Despite this, some bioagents, such as fungi and bacteria have unknown mechanisms. This review discusses the nematophagous bacteria and fungi that have been discovered so far, including Pochonia, Trichoderma sp., Pseudomonas sp., and Bacillus sp., with an overview of the current advances in research regarding their molecular and biochemical control mechanisms. Biological control agents (BCAs), as valuable ecological enemies of nematode infestations, use a range of mechanisms, such as parasitism, nutrient competition, toxin production, induce systemic resistance to antibiotics, enzymes, and enhance plant health. They suppress nematodes directly, improve plant growth, and facilitate the colonization and activities of antagonistic microbes in the rhizosphere. Understanding the molecular basis of BCAs suppression mechanisms provides the basis for their future incorporation into phytopathogen or plant disease control management. This study reviews the current threat posed by the root-knot nematode, biological control, antagonistic bioagents, and their mechanisms, and the future perspectives in modern agricultural sustainability to provide basis for the broad control of root-knot nematodes.

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Serratia proteamaculans mediated alteration of tomato defense system and growth parameters in response to early blight pathogen Alternaria solani infection

Cited by 11 publications

References 58 publications

Bacterial and fungal endophyte communities in healthy and diseased oilseed rape and their potential for biocontrol of Sclerotinia and Phoma disease

Bacterial and fungal endophyte communities in healthy and diseased oilseed rape and their potential for biocontrol of Sclerotinia and Phoma disease

Efficiency of Using Some Biological Organisms as Biological Catalysts to Reduce the Incidence of Cantaloupe Downy Mildew Disease Under Greenhouse Conditions

Mechanism of Antagonistic Bioagents in Controlling Root-Knot Nematodes (Meloidogyne sp.): A Review

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