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KMID : 1041219850270020020
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Journal of Sericultural and Entomological Science
1985 Volume.27 No. 2 p.20 ~ p.27
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Histological Observations and Comparison of the Resistance to Polyhedrosis Viruses in Various Varieties of the Silkworm, Bombyx mori L., fed on Artificial Diet
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Abstract
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This study was carried out to investigate the histological changes after the infection of nuclear and cytoplasmic polyhedrosis viruses(NPV, CPV) and the resistance to the viruses in various varieties of the silkworm fed on artificial diet.
The results obtained were as follows; Among four varieties of silkworm tested, Jam 107 X Jam 108 was more resistant than the other varieties tested and Jam 119 X Jam 120 was the most resistant to CPV.
In case of peroral infection with NPV, Jam 107 X Jam 108 showed lower mortality than the remained varieties in low concentration (104/m1). However, all varieties showed high mortality as the concentration of viruses was increased.
With infection of CPV, the varieties showed high mortality at the concentration of 107 and 108/ml, while Jam 119 X Jam 120 showed the lowest mortality at virus concentration of 104/m1.
The fat bodies, epidermal cells and tracheal epithelial cells showed high susceptibility to NPV to break the cells completely and liberate the debris to the body cavity.
The CPV infected only the cylindrical cells of mid-gut and formed polyhedrons. In some cells, CPV was liberated to gastral cavity.
In the electrophoretic pattern of hemolymph protein of silkworm larvae infected with NPV, bands were dimmed and disappeared as symptom aggravated after infection.
Electrophoretic pattern of hemolymph proteins of silkworm larvae infected with CPV showed no numerical difference at the later stage of infection, and one or two bands was observed along with lowering the concentrations.
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