Immunotranscriptomic Profiling of Spodoptera frugiperda Challenged by Different Pathogenic Microorganisms

Area of Science:

• * Entomology
• * Molecular Biology
• * Immunology

Background:

• * *Spodoptera frugiperda* (fall armyworm) is a major migratory agricultural pest with global economic impact.
• * Understanding insect-pathogen molecular interactions is key to developing effective microbial control strategies.
• * Proactive monitoring and novel biopesticide development are crucial for managing fall armyworm populations.

Purpose of the Study:

• * To investigate the immune system's molecular composition and regulatory mechanisms in *S. frugiperda* larvae.
• * To identify immune-related genes and analyze their expression patterns following bacterial and fungal infections.
• * To provide insights for enhancing existing microbial agents and developing new biopesticides.

Main Methods:

• * Transcriptome sequencing of *S. frugiperda* larvae infected with bacteria and fungi.
• * Identification and phylogenetic analysis of immune-related genes.
• * Quantitative PCR (qPCR) to validate gene expression, specifically for peptidoglycan recognition proteins (PGRPs).

Main Results:

• * A total of 598 immune-related genes were identified in *S. frugiperda*.
• * Most identified immune genes exhibited upregulated expression upon microbial challenge.
• * Phylogenetic analysis indicated a conserved immune gene repertoire.
• * qPCR confirmed significant upregulation of peptidoglycan recognition protein genes in response to specific pathogens.

Conclusions:

• * The study elucidates the immune transcriptome of *S. frugiperda* in response to diverse microbial pathogens.
• * Findings offer valuable insights for improving the efficacy of current microbial control agents.
• * The research supports the development of novel, highly efficient, and specific biopesticides against this pest.