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VOL. 5, ISSUE 2 (2023)
Bacterial symbionts of entomopathogenic nematodes against meloidogyne incognita (kofoid & white, 1919) (tylenchida: Heteroderidae)
Authors
Jihan Muhammad, Heba A Alghnam, Azazy A M, Waleed D Saleh, M A Ali
Abstract
The root-knot nematode (RKN), Meloidogyne incognita (Kofoid
& White, 1919) (Tylenchida: Heteroderidae), is a significant
pest that is widely distributed around the world and reduces crop yields.
Unfortunately, the majority of the powerful chemicals used to control RKN are
extremely poisonous, very expensive, and have harmful effects on the
environment. Utilising biocontrol agents is one of the potential viable
alternatives. Entomopathogenic bacteria are one of the most effective and
eco-friendly biocontrol agents for treating the root-knot nematode. This
study's goal was to assess the efficiency of culture broth, cell pellet
suspensions and cell-free Xenorhabdus and Photorhabdus filtrates bacteria
against root-knot nematodes. Under
laboratory conditions, culture broth, cell pellet suspensions, and cell-free
filtrates of Photorhabdus and Xenorhabdus bacteria strains obtained from
various Egyptian nematodes were tested for their ability to repress the
activity of the root-knot nematode, M. incognita. Increasing the density
of all seven strains of bacteria increased the mortality rate in juvenile
Meloidogyne incognita (P<0.05) for all strains and exposure durations. P.
luminescens (EGAP2) had the highest density (4 x 107 cells/mL)
of the strains tested, and it killed more than 97% of the root-knot nematode
J2s after 48 hours of exposure. There was also a significant difference in
after 48 hours of exposure, the efficacy of cell-free filtrates was determined
(P 0.05). Secondary metabolite concentrations at 100% were more effective than
other concentrations, with significant differences (P <0.05). The data
clarified that all symbiotic bacterial cell pellet Cell-free filtrates and
suspensions exhibited potent activities to reduce the root-knot nematode. Their
nematicidal activity was concentration-dependent. In conclusion, bacterial
symbionts of entomopathogenic nematodes can be an optimal option for biocontrol
of the root-knot nematode.
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Pages:65-69
How to cite this article:
Jihan Muhammad, Heba A Alghnam, Azazy A M, Waleed D Saleh, M A Ali "Bacterial symbionts of entomopathogenic nematodes against <i>meloidogyne incognita</i> (kofoid & white, 1919) (tylenchida: Heteroderidae)". International Journal of Agriculture and Plant Science, Vol 5, Issue 2, 2023, Pages 65-69
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