Publications

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evolutionary relationships of primary prokaryotic endosymbionts of whiteflies and their hosts.whiteflies (hemiptera: sternorrhyncha: aleyrodidae) are plant sap-sucking insects that harbor prokaryotic primary endosymbionts (p-endosymbionts) within specialized cells located in their body cavity. four-kilobase dna fragments containing 16s-23s ribosomal dna (rdna) were amplified from the p-endosymbiont of 24 whiteflies from 22 different species of 2 whitefly subfamilies. in addition, 3-kb dna fragments containing mitochondrial cytb, nd1, and large-subunit rdna (lrdna) were amplified from 17 ...200415184137
whitefly (bemisia tabaci) genome project: analysis of sequenced clones from egg, instar, and adult (viruliferous and non-viruliferous) cdna libraries.the past three decades have witnessed a dramatic increase in interest in the whitefly bemisia tabaci, owing to its nature as a taxonomically cryptic species, the damage it causes to a large number of herbaceous plants because of its specialized feeding in the phloem, and to its ability to serve as a vector of plant viruses. among the most important plant viruses to be transmitted by b. tabaci are those in the genus begomovirus (family, geminiviridae). surprisingly, little is known about the geno ...200616608516
identification and localization of a rickettsia sp. in bemisia tabaci (homoptera: aleyrodidae).whiteflies (homoptera: aleyrodidae) are sap-sucking insects that harbor "candidatus portiera aleyrodidarum," an obligatory symbiotic bacterium which is housed in a special organ called the bacteriome. these insects are also home for a diverse facultative microbial community which may include hamiltonella, arsenophonus, fritchea, wolbachia, and cardinium spp. in this study, the bacteria associated with a b biotype of the sweet potato whitefly bemisia tabaci were characterized using molecular fing ...200616672513
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 ...200717645822
prevalence of endosymbionts in bemisia tabaci populations and their in vivo sensitivity to antibiotics.bemisia tabaci can harbor both primary and secondary endosymbionts, and the specific endosymbionts can differ among different b. tabaci biotypes. this study determined (1) the prevalence of the primary endosymbiont portiera aleyrodidarum and secondary endosymbionts arsenophonus and wolbachia in two invasive biotypes (b and q) and one indigenous biotype (cv) in china and (2) the in vivo effect of three antibiotics (tetracycline, ampicillin trihydrate, and rifampicin) against the endosymbionts; if ...201020217091
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 ...201020462452
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 ...201121476990
rickettsia 'in' and 'out': two different localization patterns of a bacterial symbiont in the same insect species.intracellular symbionts of arthropods have diverse influences on their hosts, and their functions generally appear to be associated with their localization within the host. the effect of localization pattern on the role of a particular symbiont cannot normally be tested since the localization pattern within hosts is generally invariant. however, in israel, the secondary symbiont rickettsia is unusual in that it presents two distinct localization patterns throughout development and adulthood in i ...201121712994
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 ...201122251681
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