Ultrastructure of a novel Cardinium sp. symbiont in Scaphoideus titanus (Hemiptera: Cicadellidae)

E. Bigliardi*, L. Sacchi, M. Genchi, A. Alma, M. Pajoro, D. Daffonchio, M. Marzorati, A. M. Avanzati

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


An ultrastructural study of the novel symbiont Cardinium sp. was performed with particular attention to the description of the structure and organization of highly elaborated cytoplasmic complexes containing microtubule-like elements (MLC). Three major components were observed. The first was a system of microtubule-like elements (ML) arranged in parallel array extending from the plasma membrane into the cytosol of the bacterium. The second, an fibrous electrondense plaque (FEP), approximately 8 nm thick, located 7.5 nm away from the plasma membrane and parallel to it. The third component, not previously reported, was described for the first time in this paper. This consisted of a set of regularly distributed 8 nm electron-dense structures (ES), with a center-to-center spacing of about 12 nm, adhering to the outer leaflet of the plasma membrane. Often, the ES created a close connection between the plasma membrane and the outer membrane, so that in this area they became straight and stiff. The first and second component of these structures are compared to previously described microtubules and microfilaments.

Original languageEnglish (US)
Pages (from-to)257-261
Number of pages5
JournalTissue and Cell
Issue number4
StatePublished - 2006
Externally publishedYes


  • Cardinium sp. symbiont
  • Electron-dense structures
  • Fibrous electron-dense plaque
  • Microtubular-like complex
  • Ultrastructure

ASJC Scopus subject areas

  • Developmental Biology
  • Cell Biology


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