Abstract
Odorant-binding proteins (OBPs) and chemosensory proteins (CSPs) play important roles in insect chemosensory systems. In the Asian corn borer Ostrinia furnacalis (Guenee) (Lepidoptera: Crambidae), only a fraction of them have been examined for their expression patterns. In this study, we compared the expression levels of 24 OBPs and 19 CSPs between sexes using quantitative RT-PCR. Sexually biased expression was observed for 17 OBPs and 7 CSPs in virgin individuals. Expression levels of 18 OBPs and 10 CSPs changed after mating, resulting in sexually biased expression in 16 OBPs and 1 CSP. The effect of mating was sex-specific in 9 OBPs and 2 CSPs. These results suggest a sexually divergent molecular composition and may indicate a functional divide between OBP and CSP genes in the chemosensory system of O. furnacalis.
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