Chitosan double-stranded RNA nanocomplexes for Piezodorus guildinii control

Area of Science:

• Agricultural Entomology
• Molecular Biology
• Nanotechnology

Background:

• Piezodorus guildinii infestation significantly reduces soybean yield, grain quality, and germination.
• RNA interference (RNAi) offers a safe, targeted approach for pest management.
• dsRNA conjugation with polymers like chitosan enhances stability and efficacy.

Purpose of the Study:

• To assess the impact of dsRNA administration on P. guildinii viability.
• To evaluate dsRNA-chitosan nanocomplexes as a pest control strategy.

Main Methods:

• Synthesis and administration of dsRNAs targeting specific genes in P. guildinii.
• Evaluation of insect mortality via injection and ingestion assays.
• Development and in vitro/in vivo testing of dsRNA-chitosan nanocomplexes.
• Gene expression analysis using RT-qPCR.

Main Results:

• dsRNA administration resulted in significant mortality rates (76% via injection, 49% via ingestion).
• Chitosan-dsRNA nanocomplexes showed enhanced stability and a 66% cumulative corrected mortality rate in vivo.
• Targeted gene expression was significantly reduced post-treatment.

Conclusions:

• dsRNA administration effectively reduces P. guildinii viability and silences target genes.
• Chitosan-dsRNA nanoparticles offer improved stability and efficacy for pest control.
• These findings support the development of novel integrated management strategies for stink bug control.