Ultrastructural studies of the fat body and bacterial endosymbionts of Cryptocercus punctulatus Scudder (Blattaria: Cryptocercidae)

L. Sacchi, C. A. Nalepa, E. Bigliardi, S. Corona, A. Grigolo, U. Laudani, C. Bandi

Research output: Contribution to journalArticle

Abstract

Transmission electron microscopy of ultra-thin sections and freeze-fracture replicas of the fat body of the wood feeding cockroach Cryptocercus punctulatus show that the protein and lipid stores in trophocytes are substantially smaller than in those of cockroaches that are not xylophagous. The urocytes exhibit needle-shaped deposits of urate arranged in concentric layers around central cores. Bacteriocytes harbor in their cytoplasm Gram-negative bacterial endosymbionts enclosed in a vacuolar membrane. In the vacuolar space, vesicles formed by a blebbing process were observed detaching from the symbionts' outer membrane. These processes suggest the presence of metabolite exchange between host cell and endosymbionts. Among adjacent bacteriocytes, trophocytes, and urocytes, cell membranes exhibit junctional complexes that may allow for metabolic interaction. Transmission of the bacterial endosymbionts occurs via transovarial transmission, as in other cockroaches.

Original languageEnglish
Pages (from-to)251-269
Number of pages19
JournalSymbiosis
Volume25
Issue number1-3
Publication statusPublished - 1998

Keywords

  • Cockroaches
  • Cryptocercus punctulatus
  • Endocytobiosis
  • Fat body
  • Symbiotic bacteria

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Microbiology

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    Sacchi, L., Nalepa, C. A., Bigliardi, E., Corona, S., Grigolo, A., Laudani, U., & Bandi, C. (1998). Ultrastructural studies of the fat body and bacterial endosymbionts of Cryptocercus punctulatus Scudder (Blattaria: Cryptocercidae). Symbiosis, 25(1-3), 251-269.