Glucosinolate induces transcriptomic and metabolic reprogramming in Helicoverpa armigera

Area of Science:

• Plant-insect interactions
• Molecular toxicology
• Insect biochemistry

Background:

• Glucosinolates are plant defense compounds against herbivores.
• Insect resistance to glucosinolates is known, but molecular effects remain unclear.
• Helicoverpa armigera is a significant agricultural pest.

Purpose of the Study:

• To investigate the molecular mechanisms of sinigrin toxicity in Helicoverpa armigera.
• To elucidate the metabolic responses of H. armigera to sinigrin exposure.

Main Methods:

• Transcriptomics and metabolomics analyses were performed on sinigrin-fed H. armigera.
• Gene Ontology and KEGG pathway enrichment analyses were used to identify affected biological processes and pathways.
• Correlation between transcriptomic and metabolomic data was assessed.

Main Results:

• Sinigrin exposure significantly altered 2375 transcripts in H. armigera, affecting hydrolases, oxidoreductases, and transferases.
• Sinigrin induced oxidative stress by targeting the endomembrane system and mitochondria, potentially via allyl isothiocyanate (AITC).
• Upregulation of oxidative phosphorylation, glutathione, and amino acid metabolism pathways suggests detoxification mechanisms, including increased glutathione production.

Conclusions:

• Sinigrin induces oxidative stress and disrupts cellular processes in Helicoverpa armigera.
• Insects exhibit metabolic adaptations, including enhanced glutathione synthesis, to cope with sinigrin toxicity.
• Understanding these molecular interactions is crucial for developing effective pest management strategies.