Quantitative proteomic analysis of the fall armyworm saliva

Area of Science:

• Entomology
• Proteomics
• Plant-Insect Interactions

Background:

• Lepidopteran larvae secrete saliva on plants, influencing digestion and plant defense.
• Understanding insect saliva composition is crucial due to ecological and economic impacts.
• Knowledge of fall armyworm (FAW) saliva proteome is limited.

Purpose of the Study:

• Identify salivary proteins in FAW (Spodoptera frugiperda).
• Compare salivary proteomes between FAW corn and rice strains.
• Investigate how host plants affect FAW saliva composition.

Main Methods:

• Quantitative proteomics using isobaric tags for relative and absolute quantification (iTRAQ).
• Liquid chromatography-tandem mass spectrometry (LC-MS/MS).
• Label-free proteomic analysis for strain-specific differences.

Main Results:

• Identified 98 proteins in FAW saliva, categorized into functional groups (defense, offense, immunity, detoxification, digestion).
• Detected differences in salivary proteome between corn and rice strains.
• Observed diet-induced changes in protein concentration and abundance within and between strains.

Conclusions:

• FAW saliva contains a complex, functionally diverse protein mixture.
• Saliva composition is strain-specific and plastic, adapting to different host plants.
• These findings provide insights into FAW-plant interactions and pest management strategies.