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Odontotermes formosanus  (Shiraki) is an important pest in the world.  Serratia marcescens  have a high lethal effect on  O. formosanus,  but the specific insecticidal mechanisms of  S. marcescens  on  O. formosanus  are unclear, and the immune responses of  O. formosanus  to  S. marcescens  have not been clarified. At present, genetic database resources of  O. formosanus  are extremely scarce. Therefore, using  O. formosanus  workers infected by  S. marcescens  and the control as experimental materials, a full-length transcriptome was sequenced using the PacBio Sequel sequencing platform. A total of 10,364 isoforms were obtained as the final transcriptome. The unigenes were further annotated with the Nr, Swiss-Prot, EuKaryotic Orthologous Groups (KOG), Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) Ortholog public databases. In a comparison between the control group and a  Serratia marcescens- infected group, a total of 259 differentially expressed genes (DEGs) were identified, including 132 upregulated and 127 downregulated genes. Pathway enrichment analysis indicated that the expression of the mitogen-activated protein kinase (MAPK) pathway, oxidative stress genes and the AMP-activated protein kinase (AMPK) pathway in  O. formosanus  may be associated with  S. marcescens  treatment. This research intensively studied  O. formosanus  at the high-throughput full-length transcriptome level, laying a foundation for further development of molecular markers and mining of target genes in this species and thereby promoting the biological control of  O. formosanus.  Furthermore, these results will be helpful to clarify the action mechanisms of  S. marcescens  on  O. formosanus,  and also explore the relationship between  O. formosanus  and  S. marcescens . In addition, this study will identify the immune response of  O. formosanus  to  S. marcescens , which will provide a theoretical foundation for the development of new immunosuppressants for  O. formosanus .

SMRT sequencing of the full-length transcriptome of Odontotermes formosanus (Shiraki) under Serratia marcescens treatment