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Tropidothorax elegans  Distant (Hemiptera: Lygaeidae) is an insect pest that inflicts damage to vegetables and flowering plants across China. The olfactory system regulates insect behavior, such as feeding, mating, oviposition and predator avoidance. Odorant-binding proteins (OBPs) and the chemosensory proteins (CSPs) are two groups of small soluble proteins that initiate olfactory signal transduction in insects. In this study, we generated antennal transcriptomes of male and female  T .  elegans , and identified 19 putative OBP (14 classic OBPs and five plus-C OBPs) and seven CSP genes. Through real-time quantitative PCR analysis, we found that 14 of the 19 OBP genes were highly expressed in the antennae of both adult females and males, and 3 OBP genes were expressed higher in the antennae of males than females. Some OBP genes were also highly expressed in the legs or wings. Three CSP genes were highly expressed in the antennae of both sexes, and  TeleCSP7  showed higher expression in male antennae compare to females. Interestingly, one CSP gene,  TeleCSP2 , was expressed in all olfactory tissues. Our results provide molecular insights into further investigating of the olfactory system of an important plant pest,  T .  elegans .

scientific reports

Identification and tissue distribution of chemosensory protein and odorant binding protein genes in Tropidothorax elegans Distant (Hemiptera: Lygaeidae)