Ultrastructure of the midgut of the worker honey bee Apis mellifera heavily infected with Nosema apis |
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Authors: | T.P. Liu |
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Affiliation: | Bee Disease Research Laboratory, Agriculture Canada, Research Station, Box 29, Beaverlodge, Alberta, T0H 0C0, Canada |
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Abstract: | Midgut epithelial cells from healthy bees possessed numerous mitochondria, strands of endoplasmic reticulum, evenly distributed ribosomes, zymogen granules, and two kinds of lipid inclusions. In heavily infected midguts of honey bees, Apis mellifera, all epithelial cells were observed to be infected with Nosema apis. Cells of the entire midgut were packed with mature spores and, in some cases, mixed with immature stages. Spores were not found among cells of the brush border and basal infolding. Muscle cells and tracheal end cells of the midgut were not infected. The cytoplasm of the infected cell contained a large number of vacuoles, numerous large inclusion bodies, and aggregated ribosomes. Signs of extensive lysis were observed within the heavily infected cells, although the cell membranes were intact. |
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Keywords: | midgut infection mature spores tissue specificity epithelial cell lysis tracheal network inclusion bodies, lipid droplets zymogen granules mitochondria endoplasmic reticulum |
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