Abstract
Ovaries ofPalaeococcus fuscipennis (Burmeister) are accompanied by large organs termed bacteriomes which are composed of large cells termed bacteriocytes. Each bacteriocyte is surrounded with small epithelial cells. The bacteriocyte cytoplasm is tightly packed with pleomorphic bacteria, whereas in epithelial cells small coccoid microorganisms are present. The number of coccoid bacteria is significantly lower than pleomorphic bacteria. The ovarioles containing choriogenic oocytes are invaded both by pleomorphic as well by coccoid bacteria. Microorganisms traverse the follicular epithelium and enter the perivitelline space. During advanced choriogenesis, endosymbionts are accumulated in the deep depression of the oocyte. Bacteria do not enter the ooplasm until the end of oocyte growth.
Highlights
Ovaries of Palaeococcus fuscipennis (Burmeister) are accompanied by large organs termed bacteriomes which are composed of large cells termed bacteriocytes
Endosymbioses in plant-sucking hemipterans have been extensively studied by BUCHNER (1965, 1966, 1967, 1969) who has shown that endosymbiotic microorganisms occur both in primitive as well as in advanced families of scale insects
The bacteriocyte cytoplasm is filled with large, pleomorphic bacteria, a ramified nucleus, ribosomes and numerous mitochondria (Fig. 3)
Summary
Ovaries of Palaeococcus fuscipennis (Burmeister) are accompanied by large organs termed bacteriomes which are composed of large cells termed bacteriocytes. The bacteriocyte cytoplasm is tightly packed with pleomorphic bacteria, whereas in epithelial cells small coccoid microorganisms are present. Endosymbioses (i.e. types of endosymbiotic microorganisms, their localization in the body of host insects, their transmission) in plant-sucking hemipterans have been extensively studied by BUCHNER (1965, 1966, 1967, 1969) who has shown that endosymbiotic microorganisms occur both in primitive as well as in advanced families of scale insects It should be noted that KOTEJA and co-workers (2003) using electron microscopy revealed the occurrence of numerous gentle, rodlike bacteria in ovaries of Steingelia gorodetskia (Steingeliidae) This indicates that knowledge of the transmission of endosymbiotic microorganisms in primitive scale insects is incomplete. It has been experimentally proven that pea aphids, Acyrthosiphon pisum, harboring secondary endosymbionts, are more resistant to heat stress (MONTLLOR et al 2002), parasitic hymenopteran attacks (OLIVER et al 2003) and fungal pathogens (SCARBOROUGH et al 2005) than sterile specimens
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