6-pentyl-α-pyrone from Trichoderma koningii induces systemic resistance in tobacco against tobacco mosaic virus

This study aimed at evaluating the ability of 6-pentyl-α-pyrone (6PP) isolated from Trichoderma koningii CTX1172 (AUMC 11520), an endophytic fungal strain to induce systemic resistance in tobacco ( Nicotiana tabacum cv. White Burley) plant against tobacco mosaic virus (TMV). 6PP exhibited 10–60% sym...

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Bibliographic Details
Published in:European journal of plant pathology 2021, Vol.159 (1), p.81-93
Main Authors: Taha, Mohamed A., Ismaiel, Ahmed A., Ahmed, Rania M.
Format: Article
Language:English
Subjects:
Agriculture
Antioxidants
Biological control
Biomedical and Life Sciences
Disease resistance
Ecology
Endophytes
Fungi
Gene expression
Life Sciences
Low concentrations
Nicotiana tabacum
Pathogenesis
Peroxidase
Plant diseases
Plant Pathology
Plant Sciences
Polyphenol oxidase
Proline
Signs and symptoms
Superoxide dismutase
Tobacco
Tobamovirus
Trichoderma koningii
Viral diseases
Viruses
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Summary:This study aimed at evaluating the ability of 6-pentyl-α-pyrone (6PP) isolated from Trichoderma koningii CTX1172 (AUMC 11520), an endophytic fungal strain to induce systemic resistance in tobacco ( Nicotiana tabacum cv. White Burley) plant against tobacco mosaic virus (TMV). 6PP exhibited 10–60% symptoms inhibition at low concentrations (10–30 μg mL −1 ) achieving 100% biocontrol efficacy at high concentrations (40 and 50 μg mL −1 ), compared with control. Using DAS-ELISA technique for detection of TMV (expressed by decreasing in absorbance value), the TMV detection was significantly reduced in plants treated with 6PP at low concentrations compared with plants inoculated with TMV only and it was almost undetectable in plants treated with high concentrations, as well as healthy control plants. Application of 6PP not only increased the accumulation of proline as a non-enzymatic antioxidant compound, but also increased the activities of pathogenesis-related enzymes (superoxide dismutase, peroxidase and polyphenol oxidase), indicating that 6PP acts as elicitor for induction of resistance in tobacco against TMV. On the molecular level, plants treated with 6PP also showed augmented and rapid expression of defense-related genes including PR-a , PR-b and PR-10 . This study was the first to imply the potential of a pyrone compound in biocontrol of plant viral disease.
ISSN:0929-1873
1573-8469
DOI:10.1007/s10658-020-02142-2