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Article Dans Une Revue Symbiosis Année : 2002

Occurence of endosymbiosis in Dryophtoridae weevils: cytological insights into bacterial symbiotic structures

Résumé

To gain a better understanding of the occurrence of intracellular symbiosis in the Dryophthoridae family, nine species worldwide were analyzed in relation to the presence/absence and the structure of bacteriomes, the specialized organs harbouring the symbiotic bacteria. Staining protocols have indicated the presence of bacteriomes in seven species: Sitophilus rugicollis, Diocalandra [rumenti, Sphenophorus siriatopunctata, Sipalinus gigas, Trigonotarsus rugosus, Dynam is borassi and Rhynchophorus palmarum. Strong evidence also suggests the presence of intracellular bacteria within Siiophilus uateriae. However, Siiophilus linearis has been shown to be completely devoid of intracellular endosymbionts. In all symbiotic species, the larval bacteriome does not exhibit any diversity with regard to the form and the location, always in the anterior part of larvae. It is delimited by a thin membrane, it contains an important tracheal network and it is attached to the intestine at many sites. At least two cell types have been observed within the bacteriome: bacteriocytes, the polyploid cells harbouring bacteria and, between them, small flat cells forming the interstitial tissue. Taken together, these results argue in favor of a common origin of the symbiotic structures in the Dryophthoridae family.
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hal-03504053 , version 1 (10-01-2022)

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Paul Nardon, Lefèvre Cédric, B. Delobel, Hubert Charles, Abdelaziz Heddi. Occurence of endosymbiosis in Dryophtoridae weevils: cytological insights into bacterial symbiotic structures. Symbiosis, 2002, 33, pp.227-241. ⟨hal-03504053⟩
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