The ultrastructural investigation of the midgut in the quill mite Syringophilopsis fringilla (Acari,Trombidiformes: Syringophilidae) |
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| Authors: | SA Filimonova |
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| Institution: | 1. Department of Plant Pests, Institute for Plant Protection and Environment, Banatska 33, 11080 Zemun, Serbia;2. Faculty of Biology, University of Belgrade, Studentski trg 6, 11000 Belgrade, Serbia;3. Laboratory of Agricultural Entomology, Department of Entomology and Agricultural Zoology, Benaki Phytopathological Institute, 8 Stefanou Delta str., 14561 Kifissia, Attica, Greece;4. Institute of Entomology, Biology Center, Academy of Sciences of the Czech Republic, Ceske Budejovice, Czech Republic;5. Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11080 Zemun, Serbia;6. Institute of Integrative Biology, ETH Zürich, 8092 Zürich, Switzerland;7. EAWAG, Swiss Federal Institute of Aquatic Science and Technology, Überlandstrasse 133, 8600 Dübendorf, Switzerland;1. H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi 75270, Pakistan;2. Industrial Analytical Center, H.E.J. Research Institute of Chemistry, University of Karachi, Karachi 75270, Pakistan;3. M.A.H. Qadri Biological Research Center, University of Karachi, Karachi 75270, Pakistan;4. Medicinal Plant Information and Photographic Center, House no-240, Ramchandrapur, Dist-Rajshahi 6100, Bangladesh;1. Institut National de la Recherche Agronomique (INRA), UMR 1332 Biologie du Fruit et Pathologie, Villenave d''Ornon, France;2. Université de Bordeaux, UMR 1332 Biologie du Fruit et Pathologie, Villenave d''Ornon, France;3. Université de Lyon, INSA-Lyon, INRA, UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, F-69621 Villeurbanne, France;4. Université de Poitiers, UMR CNRS 7267 Ecologie et Biologie des Interactions, Equipe Ecologie, Evolution, Symbiose;5. INRA, Evolution and Specificity of Multitrophic Interactions (ESIM), UMR 1355 Institut Sophia Agrobiotech (ISA), Sophia Antipolis, France;1. Faculty of Science, Charles University in Prague, Department of Ecology, Vini?ná 7, 128 44 Praha 2, Czech Republic;2. Graduate Program in Endocrinology and Animal Biosciences, Rutgers University, 84 Lipman Drive, New Brunswick, NJ 08901, USA;3. Department of Ecology, Evolution, and Natural Resources, Rutgers University, 14 College Farm Road, New Brunswick, NJ 08901, USA |
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| Abstract: | The midgut of the females of Syringophilopsis fringilla (Fritsch) composed of anterior midgut and excretory organ (=posterior midgut) was investigated by means of light and transmission electron microscopy. The anterior midgut includes the ventriculus and two pairs of midgut caeca. These organs are lined by a similar epithelium except for the region adjacent to the coxal glands. Four cell subtypes were distinguished in the epithelium of the anterior midgut. All of them evidently represent physiological states of a single cell type. The digestive cells are most abundant. These cells are rich in rough endoplasmic reticulum and participate both in secretion and intracellular digestion. They form macropinocytotic vesicles in the apical region and a lot of secondary lysosomes in the central cytoplasm. After accumulating various residual bodies and spherites, the digestive cells transform into the excretory cells. The latter can be either extruded into the gut lumen or bud off their apical region and enter a new digestive cycle. The secretory cells were not found in all specimens examined. They are characterized by the presence of dense membrane-bounded granules, 2–4 μm in diameter, as well as by an extensive rough endoplasmic reticulum and Golgi bodies. The ventricular wall adjacent to the coxal glands demonstrates features of transporting epithelia. The cells are characterized by irregularly branched apical processes and a high concentration of mitochondria. The main function of the excretory organ (posterior midgut) is the elimination of nitrogenous waste. Formation of guanine-containing granules in the cytoplasm of the epithelial cells was shown to be associated with Golgi activity. The excretory granules are released into the gut lumen by means of eccrine or apocrine secretion. Evacuation of the fecal masses occurs periodically. Mitotic figures have been observed occasionally in the epithelial cells of the anterior midgut. |
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