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Authors: Cheng, Jun-Feng and Yu, Ting and Chen, Zhong-Jian and Chen, Yu-Peng and Gao, Lei and Zhang, Wen-Hu and Jiang, Bo and Bai, Xue and Liu, Jun and Lu, Yong-Yue

The citrus fruit fly Bactrocera (Tetradacus) minax is a major and devastating agricultural pest in Asian subtropical countries. Previous studies have shown that B. minax interacts with hosts via an efficient chemosensory system. However, knowledge regarding the molecular components of the B. minax chemosensory system has not yet been well established. Herein, based on our newly generated whole-genome dataset for B. minax and by comparison with the characterized genomes of 6 other fruit fly species, we identified, for the first time, a total of 25 putative odorant-binding receptors (OBPs), 4 single-copy chemosensory proteins (CSPs) and 53 candidate odorant receptors (ORs). To further survey the expression of these candidate genes, the transcriptomes from three developmental stages (larvae, pupae and adults) of B. minax and Bactrocera dorsalis were analyzed. We found that 1) at the adult developmental stage, there were 14 highly expressed OBPs (FPKM>100) in B. dorsalis and 7 highly expressed OBPs in B. minax; 2) the expression of CSP3 and CSP4 in adult B. dorsalis was higher than that in B. minax; and 3) most of the OR genes exhibited low expression at the three developmental stages in both species. This study on the identification of the chemosensory system of B. minax not only enriches the existing research on insect olfactory receptors but also provides new targets for preventative control and ecological regulation of B. minax in the future.

Journal: PeerJ preprints
DOI: 10.7287/peerj.preprints.27297v1
Year: 2018

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