Pathogenicity and Volatile Nematicidal Metabolites from <i>Duddingtonia flagrans</i> against <i>Meloidogyne incognita</i>
Plant parasitic nematodes, especially parasitic root-knot nematodes, are one of the most destructive plant pathogens worldwide. The control of plant root-knot nematodes is extremely challenging. <i>Duddingtonia flagrans</i> is a type of nematode-trapping fungi (NTF), which produces three...
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| Autores principales: | , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/89eff4ea375d460d86738bc5a05b31f1 |
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| Sumario: | Plant parasitic nematodes, especially parasitic root-knot nematodes, are one of the most destructive plant pathogens worldwide. The control of plant root-knot nematodes is extremely challenging. <i>Duddingtonia flagrans</i> is a type of nematode-trapping fungi (NTF), which produces three-dimensional adhesive networks to trap nematodes. In this study, the pathogenicity and volatile organic compounds (VOCs) of the NTF <i>D. flagrans</i> against the plant root-knot nematode, <i>Meloidogyne incognita</i>, were investigated. The predatory process of <i>D. flagrans</i> trapping <i>M. incognita</i> was observed using scanning electron microscopy. Gas chromatography-mass spectrometry analysis of the VOCs from <i>D. flagrans</i> led to the identification of 52 metabolites, of which 11 main compounds were tested individually for their activity against <i>M. incognita</i>. Three compounds, cyclohexanamine, cyclohexanone, and cyclohexanol, were toxic to <i>M. incognita</i>. Furthermore, these three VOCs inhibited egg hatching of <i>M. incognita</i>. Cyclohexanamine showed the highest nematicidal activity, which can cause 97.93% mortality of <i>M. incognita</i> at 8.71 µM within 12 h. The number of hatched juveniles per egg mass after 3 days was just 8.44 when treated with 26.14 µM cyclohexanamine. This study is the first to demonstrate the nematicidal activity of VOCs produced by <i>D. flagrans</i> against <i>M. incognita</i>, which indicates that <i>D. flagrans</i> has the potential to biocontrol plant root-knot nematodes. |
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