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Su Liu,Xiang-Jun Rao,Mao-Ye Li,Shi-Guang Li 한국곤충학회 2015 Entomological Research Vol.45 No.3
In insects, cytochrome P450 monooxygenases (P450s) have received considerable attention for their roles in the detoxification of harmful chemicals and insecticide resistance. The rice leaf‐folder, Cnaphalocrocis medinalis, is a severe lepidopteran rice pest. In this research, 36 putative P450 genes were identified from the transcriptome dataset of C. medinalis. Phylogenetic analysis showed that these genes fell into four clans, including the mitochondrial clan (6 genes), CYP2 clan (5 genes), CYP3 clan (16 genes) and CYP4 clan (9 genes), and were classified into 19 families and 30 subfamilies. Since the CYP6 P450 family in insects is the major family related to the detoxification of xenobiotics, the expression profiles of five genes in the CYP6 family were determined by real‐time quantitative PCR. These genes were differentially expressed in various larval tissues, including the midgut, Malpighian tubules and fat body. Of these, CYP6AW1 and CYP6CV1 were mainly expressed in the midgut, while CYP6AE76 was highly expressed in the fat body. CYP6AB62 and CYP6AE28 were ubiquitously expressed. The transcription of CYP6AE28 was significantly induced by abamectin at LD20 dose. Taken together, the results provided useful information for the characteristics of P450s in C. medinalis and for future functional studies.
Xiao-Ming Liu,Bang-Xian Zhang,Shi-Guang Li,Xiang-Jun Rao,Dong-MingWang,Xiao-Xuan Hu,Su Liu 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.2
The yellow mealworm beetle, Tenebrio molitor (Coleoptera: Tenebrionidae), is a common insect pest that damages stored grain. The insect olfactory co-receptor (Orco) is a transmembrane protein localized on the surface of the dendrites of olfactory sensory neurons and plays an essential role in the olfactory perception. In this study, an Orco ortholog (named as Tmol\Orco) inT.molitorwas characterized. The deduced amino acid sequence of Tmol\Orco shared significant high identities with Orcos in other insect species from distinct Orders. Reverse transcription quantitative PCR (RT-qPCR) analysis showed that Tmol\Orco was predominantly expressed in the antennae of both male and female adults, and the difference between male antennae and female antennae was not significant. Double-stranded RNA (dsRNA) directly against the Tmol\Orco mRNA was synthesized and injected into the T. molitor male adults, RT-qPCR results demonstrated that the transcription level of Tmol\Orco was significantly reduced at 6 d after the injection. The mate-seeking behavior of Tmol\Orco-silenced beetles was significantly inhibited. Compare to the control individuals, the percentage of Tmol\Orco-silenced beetles successfully find mateswas significantly decreased and the average time they spent for searching were significantly increased. These results provided first direct evidence that suppression of Tmol\Orco transcription contributes to the decline in mate recognition of T. molitor