Occurrence of endosymbiosis in dryophthoridae weevils: Cytological insights into bacterial symbiotic structures
Occurrence of endosymbiosis in dryophthoridae weevils: Cytological insights into bacterial symbiotic structures
复制标题
DOI：
--
复制
发表时间：
2002
期刊：
影响因子：
2.5
通讯作者：
P. Nardon;C. Lefèvre;B. Delobel;H. Charles;A. Heddi
中科院分区：
文献类型：
--
作者：
P. Nardon;C. Lefèvre;B. Delobel;H. Charles;A. Heddi
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 frumenti, Sphenophorus striatopunctata, Sipalinus gigas, Trigonotarsus rugosus, Dynamis borassi and Rhynchophorus palmarum. Strong evidence also suggests the presence of intracellular bacteria within Sitophilus vateriae. However, Sitophilus 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.
