Project description:Nilaparvata lugens, the brown planthopper (BPH) sucks the rice phloem sap containing high sucrose to obtain carbon source. The comparative gene expression analyses were perfomed during feeding against starvation in order to determine sugar transporter and other feeding related gene expression. Young BPH females that feed rice seedlings or feed-deprived (water-supplied) for 24 hours were prepared in triplicate. Gene expression was compared in these two groups: feeding and feed-deprived.
Project description:Nilaparvata lugens, or the brown planthopper, is one of the most notorious pest insects of cultured rice, and a model for hemimetabolous development. Recently, the N-glycome of N. lugens was explored throughout post-embryonic development and reproductive stages, which revealed differential protein N-glycosylation events between adult sexes. Identifying the proteins carrying these differential carbohydrate structures would point to the functionality of sex-dependent N-glycosylation. Furthermore, potential effects of the adult wing type on protein N-glycosylation are of interest. Here, a comprehensive investigation of the N-glycosylation sites from the adult stages of N. lugens was conducted, allowing a qualitative and quantitative comparison between sexes and wing forms at the glycopeptide level. N-glycopeptide enrichment using the N-glyco-FASP method with the high mannose/paucimannose-binding lectin Concanavalin A, or the Rhizoctonia solani agglutinin which interacts with complex N-glycans led to the identification of over 1,300 N-glycosylation sites derived from over 600 glycoproteins. Comparison of these N-glycopeptides revealed striking differences in protein N-glycosylation between sexes, while almost no differences were observed between wing types. Male- and female-specific N-glycosylation sites were identified, and some of these sex-specific N-glycosites were shown to be derived from proteins with a putative role in insect reproduction. Transcript expression experiments with complete insects and insect tissues confirmed the sex-related N-glycosylation of proteins, and expression of glycoproteins in reproductive tissues. In conclusion, this study provides original data on N-glycosylation sites of N. lugens adults, providing novel insights into planthopper’s biology and revealing that protein N-glycosylation is sex-related in this insect.