Ultrastructural changes in the midgut of worker honey bees infected with Sacbrood Virus
1991
Du Zhi-Lan | Fu Hong-Lan (Beijing Univ. (China). Dept. of Biology)
Sacbrood is a virus disease of honeybee larvae (Apis cerana). One of its characteristics is the accumulation of ecdysial fluid, rich in sacbrood virus, beneath the unshed skin or sac of dying bee. Sacbrood virus multiplied without causing symptoms in adult bees when it was injected into them or when it was fed to bees. Replication of SBV occurred in midgut of adult worker bees. Examination of midgut cells showed large accumulation of virions adjacent to the perithropic membrane in midgut lumens. Aggregates of virions were observed at different depths within peritrophic memberanes, among microvilli and within the cytoplasm of midgut cells, producing total disruption of the cytoplasm in many invaded cells, midgut cells of adult were severely damaged. In certain areas, the cells were completely destroyed, and the overling cuticle contained aggregates of virions. The cytoplasm of the ribosomes, the disappearance of the rough endoplasmic reticulum, Golgi complex, mitochondria and pronounced myelinlike whorls of the heavily infected cells caused digestive function of midgut to impair.
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