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Methods and Results:? Polymerase chain reaction-denaturing gradient gel electrophoresis (DGGE) fingerprinting was used to investigate bacterial diversity in the oriental fruit fly adult gut. The 16S rDNA cloned libraries from the intestinal tract of laboratory-reared (LR), laboratory sterile sugar-reared (LSSR) and field-collected (FC) populations of oriental fruit fly were compared. Phylogenetic analysis of 16S rDNA revealed that Gammaproteobacteria were dominant in the all samples http://www.selleck.cn/products/gdc-0068.html (73��0�C98��3%). Actinobacteria and Firmicutes were judged to be major components of a given library as they constituted 10% or more of the total clones of such library. The Flavobacteria, Deltaproteobacteria, Bacteroidetes and Alphaproteobacteria were observed in small proportions in various libraries. Further phylogenetic analyses indicated common bacterial phylotypes for all three libraries, e.g. those related to Klebsiella, Citrobacter, Enterobacter, Pectobacterium and Serratia. libshuff http://www.selleckchem.com/products/Bortezomib.html analysis showed that the bacterial communities of B.?dorsalis from the three populations were significantly different from each other (P? http://www.selleckchem.com/products/sch772984.html B.?dorsalis. Insects harbour diverse micro-organisms, many of which occupy their intestinal tract and have developed different interactions during the long period of coevolution (Dillon and Dillon 2004). Interactions between hosts and their microbes can range from mutualistic, such as the interaction between termites and their gut microbes (Breznak and Brune 1994; Schmitt-Wagner et?al. 2003), to parasitic, such as the interaction of the bacterium Paenibacillus larvae (American foulbrood) in honeybees (Schmid-Hempel 1998). Some of these interactions have been relatively well studied for their economic importance or their remarkable biology. However, the exact nature of invasive carpophagous insect pests�Cmicrobe interactions, specifically those between microbes and the major fruit flies, remains poorly understood. Previous studies on insect gut bacterial diversity were mostly based on classical cultivation methods (Pedersen and Hendriksen 1993; Karsten and Drake 1995, 1997). However, vast majority of the bacteria in nature are unculturable (Amann et?al. 1990). In recent years, molecular techniques have been implemented to characterize the enteric microbiota of many insects (Behar et?al. 2005; Capuzzo et?al. 2005; Mohr and Tebbe 2006).