Ultrastructure, distribution, and transovarial transmission of symbiotic microorganisms in Nysius ericae and Nithecus jacobaeae (Heteroptera: Lygaeidae: Orsillinae) |
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Authors: | Malgorzata Swiatoniowska Antoni Ogorzalek Aniela Golas Anna Michalik Teresa Szklarzewicz |
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Institution: | 1. Department of Animal Developmental Biology, Zoological Institute, University of Wroclaw, Sienkiewicza 21, 50-335, Wroclaw, Poland 3. Department of Genetics and Evolution, Institute of Zoology, Jagiellonian University, Gronostajowa 9, 30-387, Kraków, Poland 2. Department of Developmental Biology and Morphology of Invertebrates, Institute of Zoology, Jagiellonian University, Gronostajowa 9, 30-387, Kraków, Poland
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Abstract: | The organization of the symbiotic system (i.e., distribution and ultrastructure of symbionts) and the mode of inheritance of symbionts in two species, Nysius ericae and Nithecus jacobaeae belonging to Heteroptera: Lygaeidae, are described. Like most hemipterans, Nysius ericae and Nithecus jacobaeae harbor obligate prokaryotic symbionts. The symbiotic bacteria are harbored in large, specialized cells termed bacteriocytes which are localized in the close vicinity of the ovaries as well as inside the ovaries. The ovaries are composed of seven ovarioles of the telotrophic type. Bacteriocytes occur in each ovariole in the basal part of tropharium termed the infection zone. The bacteriocytes form a ring surrounding the early previtellogenic oocytes. The cytoplasm of the bacteriocytes is tightly packed with large elongated bacteria. In the bacteriocytes of Nysius ericae, small, rod-shaped bacteria also occur. Both types of bacteria are transovarially transmitted from one generation to the next. |
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