| symbiont diversity and non-random hybridization among indigenous (ms) and invasive (b) biotypes of bemisia tabaci. | the whitefly bemisia tabaci (hemiptera: aleyrodidae) is a worldwide pest and a vector of numerous plant viruses. b. tabaci is composed of dozens of morphologically indistinguishable biotypes and its taxonomic status is still controversial. this phloem-feeder harbours the primary symbiont portiera aleyrodidarum and potentially six secondary symbionts: cardinium, arsenophonus, hamiltonella, rickettsia, wolbachia and fritschea. in the southwest indian ocean, la réunion hosts two biotypes of this sp ... | 2011 | 21476990 |
| molecular characterization of bemisia tabaci populations in tunisia: genetic structure and evidence for multiple acquisition of secondary symbionts. | a survey was conducted during 2009-2010 seasons to identify the distribution of bemisia tabaci (gennadius) biotypes in tunisia. the genetic affiliation of collected populations was determined by polymerase chain reaction (pcr)-restriction fragment-length polymorphism (taqi) of the mitochondrial cytochrom oxidase i (mtcoi) gene. results, validated by sequencing and phylogenetic analysis, allowed the clustering of sampled sweetpotato whiteflies into b and q biotypes. as b. tabaci harbors the obli ... | 2011 | 22251681 |
| biotype-dependent secondary symbiont communities in sympatric populations of bemisia tabaci. | the sweet potato whitefly, bemisia tabaci, harbors portiera aleyrodidarum, an obligatory symbiotic bacterium, as well as several secondary symbionts including rickettsia, hamiltonella, wolbachia, arsenophonus, cardinium and fritschea, the function of which is unknown. bemisia tabaci is a species complex composed of numerous biotypes, which may differ from each other both genetically and biologically. only the b and q biotypes have been reported from israel. secondary symbiont infection frequenci ... | 2007 | 17645822 |
| chlamydial symbionts in the enigmatic xenoturbella (deuterostomia). | ultrastructural observations of the gastrodermal cells in the enigmatic xenoturbella revealed numerous chlamydiae. they are related to "candidatus fritschea" and simkania (simkaniaceae) based on 16s and 23s rrna. their 23s rrna gene contains an intron encoding a putative homing endonuclease. the chlamydiae were pleomorphic and formed intravacuolar colonies. they have flattened disk-shaped elementary bodies, either oval or bow tie-shaped in cross-section, and reticulate bodies that are spherical, ... | 2007 | 17599345 |
| further insights into the strange role of bacterial endosymbionts in whitefly, bemisia tabaci: comparison of secondary symbionts from biotypes b and q in china. | the percentage infection of secondary symbionts (ss) (wolbachia, arsenophonus, rickettsia, hamiltonella, fritschea and cardinium) in the exotic bemisia tabaci (genn.) invaders, commonly known as biotypes b and q from china, were determined by pcr. in total, 373 biotype b and 1830 biotype q individuals were screened for the presence of ss. biotype b was more abundant than biotype q from 2005 to 2006, and biotype q was more abundant from 2007 to 2009. each of the ss, with the exception of fritsche ... | 2011 | 21329550 |
| pathogenic potential of novel chlamydiae and diagnostic approaches to infections due to these obligate intracellular bacteria. | novel chlamydiae are newly recognized members of the phylum chlamydiales that are only distantly related to the classic chlamydiaceae, i.e., chlamydia and chlamydophila species. they also exhibit an obligate biphasic intracellular life cycle within eukaryote host cells. some of these new chlamydiae are currently considered potential emerging human and/or animal pathogens. parachlamydia acanthamoebae and simkania negevensis are both emerging respiratory human pathogens, waddlia chondrophila could ... | 2006 | 16614250 |
| co-infection and localization of secondary symbionts in two whitefly species. | whiteflies are cosmopolitan phloem-feeding pests that cause serious damage to many crops worldwide due to direct feeding and vectoring of many plant viruses. the sweetpotato whitefly bemisia tabaci (gennadius) and the greenhouse whitefly trialeurodes vaporariorum (westwood) are two of the most widespread and damaging whitefly species. to complete their unbalanced diet, whiteflies harbor the obligatory bacterium portiera aleyrodidarum. b. tabaci further harbors a diverse array of secondary symbio ... | 2010 | 20462452 |
| novel chlamydiae in whiteflies and scale insects: endosymbionts 'candidatus fritschea bemisiae' strain falk and 'candidatus fritschea eriococci' strain elm. | bacteria called 'fritschea' are endosymbionts of the plant-feeding whitefly bemisia tabaci and scale insect eriococcus spurius. in the gut of b. tabaci, these bacteria live within bacteriocyte cells that are transmitted directly from the parent to oocytes. whiteflies cause serious economic damage to many agricultural crops; b. tabaci fecundity and host range are less than those of bemisia argentifolii, possibly due to the presence of this endosymbiont. the b. tabaci endosymbiont has been charact ... | 2005 | 16014485 |