Abstract
BackgroundTephritid fruit flies in the genus Bactrocera are of major economic significance in agriculture causing considerable loss to the fruit and vegetable industry. Currently, there is no ideal control program. Molecular means is an effective method for pest control at present, but genomic or transcriptomic data for members of this genus remains limited. To facilitate molecular research into reproduction and development mechanisms, and finally effective control on these pests, an extensive transcriptome for the oriental fruit fly Bactrocera dorsalis was produced using the Roche 454-FLX platform.ResultsWe obtained over 350 million bases of cDNA derived from the whole body of B. dorsalis at different developmental stages. In a single run, 747,206 sequencing reads with a mean read length of 382 bp were obtained. These reads were assembled into 28,782 contigs and 169,966 singletons. The mean contig size was 750 bp and many nearly full-length transcripts were assembled. Additionally, we identified a great number of genes that are involved in reproduction and development as well as genes that represent nearly all major conserved metazoan signal transduction pathways, such as insulin signal transduction. Furthermore, transcriptome changes during development were analyzed. A total of 2,977 differentially expressed genes (DEGs) were detected between larvae and pupae libraries, while there were 1,621 DEGs between adults and larvae, and 2,002 between adults and pupae. These DEGs were functionally annotated with KEGG pathway annotation and 9 genes were validated by qRT-PCR.ConclusionOur data represent the extensive sequence resources available for B. dorsalis and provide for the first time access to the genetic architecture of reproduction and development as well as major signal transduction pathways in the Tephritid fruit fly pests, allowing us to elucidate the molecular mechanisms underlying courtship, ovipositing, development and detailed analyses of the signal transduction pathways.
Highlights
Tephritid fruit flies are of major economic importance in agriculture, causing damage to fruits and other plant crops
Generation and assembly of oriental fruit fly ESTs To obtain an overview of the B. dorsalis gene expression profile during development, cDNA samples from different developmental stages (Table 1) were prepared and sequenced on a 454 GS-FLX machine
We have generated a comprehensive transcriptome of the B. dorsalis during development using a 454 FLX platform
Summary
Tephritid fruit flies are of major economic importance in agriculture, causing damage to fruits and other plant crops. Various species of fruit flies in the genus Bactrocera vary in the number of generations and in the type of host plants used for feeding and ovipositing. It is important to identify more molecular targets involved in adult reproduction and larval development in B. dorsalis, to formulate simple and effective strategies in agricultural pest control. Tephritid fruit flies in the genus Bactrocera are of major economic significance in agriculture causing considerable loss to the fruit and vegetable industry. To facilitate molecular research into reproduction and development mechanisms, and effective control on these pests, an extensive transcriptome for the oriental fruit fly Bactrocera dorsalis was produced using the Roche 454-FLX platform
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