Cellular and humoral immune defenses of Oxya japonica (Orthoptera: Acrididae) to entomopathogenic fungi Metarhizium anisopliae

One Indonesian isolate of the fungus Metarhizium anisopliae, named Majalengka strain, was evaluated not only for its virulence but also for the immune response of rice grasshopper Oxya japonica (Orthoptera: Acrididae) as a target organism. Five aqueous suspensions with different conidia concentratio...

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Bibliographic Details
Published in:Entomological research 2011, 41(1), , pp.1-6
Main Authors: Anggraeni, Tjandra, Institut Teknologi Bandung, Bandung, West Java, Indonesia, Melanie, Padjajaran University, Sumedang, West Java, Indonesia, Putra, Ramadhani Eka, Institut Teknologi Bandung, Bandung, West Java, Indonesia
Format: Article
Language:English
Subjects:
Acrididae
cellular response
humoral response
INDONESIA
INDONESIE
METARHIZIUM ANISOPLIAE
Orthoptera
Oryza sativa
Oxya japonica
생물학
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Summary:One Indonesian isolate of the fungus Metarhizium anisopliae, named Majalengka strain, was evaluated not only for its virulence but also for the immune response of rice grasshopper Oxya japonica (Orthoptera: Acrididae) as a target organism. Five aqueous suspensions with different conidia concentrations in logarithmic series were prepared. The fungus showed high virulence as it caused 100% mortality at low conidia concentration (1.5 × 10² conidia/mL). Remarkable changes in the cellular and humoral responses were also observed when adult grasshoppers were infected with the fungus. The number of hemocytes decreased significantly within 12 h after infection. In addition, the total number of granulocytes increased rapidly in the first 12 h then gradually decreased 24 and 48 h after infections, while the number of coagulocytes fluctuated over time. The infection influenced the humoral response by increasing the phenoloxidase activity.
ISSN:1738-2297
1748-5967
1748-5967
DOI:10.1111/j.1748-5967.2010.00311.x