Induced resistance by the mutualistic endophyte, Fusarium oxysporum strain 162, toward Meloidogyne incognita on tomato

The non-pathogenic endophytic fungus, Fusarium oxysporum strain 162, originally isolated from the endorhiza of tomato roots, reduces damage caused by Meloidogyne incognita, by inhibiting juvenile penetration of and development in the root. However, little is known about the mode of action of this en...

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Bibliographic Details
Published in:Biocontrol science and technology 2007-01, Vol.17 (9-10), p.969-975
Main Authors: Dababat, A.E.F.A, Sikora, R.A
Format: Article
Language:English
Subjects:
Biological control
biological control agents
endophytes
Fusarium oxysporum
induced resistance
Lycopersicon esculentum
mechanism of action
Meloidogyne incognita
mortality
motility
mutalistic endophytic fungus
Nematoda
pest resistance
plant pests
root-knot nematode
root-knot nematodes
Solanum lycopersicum var. lycopersicum
strain differences
strains
tomatoes
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Summary:The non-pathogenic endophytic fungus, Fusarium oxysporum strain 162, originally isolated from the endorhiza of tomato roots, reduces damage caused by Meloidogyne incognita, by inhibiting juvenile penetration of and development in the root. However, little is known about the mode of action of this endophyte fungus against the nematode. This study aimed at investigating how the endophyte affects nematode motility and survival and if induced resistance plays a role in the relationship. In a previous study, F. oxysporum strain 162 decreased nematode penetration of tomato up to 60%. In experiments using a split-root chamber to test for induced resistance, nematode penetration, number of galls, and number of egg masses were investigated 2 and 5 weeks after nematode inoculation. Split-root plants treated with F. oxysporum strain 162 showed 26-45% less nematode penetration, 21-36% less galls and a 22-26% reduction in the number of egg masses in the roots not directly inoculated with the fungus when compared to untreated control plants in repeated tests. In conclusion, inoculation of tomato plants with the non-pathogenic fungal endophyte F. oxysporum strain 162 resulted in a signficant reduction of nematode infection, which was in part due to induced resistance in the first 2-3 weeks after fungal inoculation.
ISSN:0958-3157
1360-0478
DOI:10.1080/09583150701582057