RNAi-based targeting of yeast-like symbionts for sustainable corn planthopper pest management
A targeted pest control approach that uses gene-silencing to disrupt essential nitrogen-recycling and amino acid biosynthesis pathways in yeast-like fungal endosymbionts (YLSs) of the corn planthopper (Peregrinus maidis), a major threat to maize and sorghum. The strategy aims to reduce insect fitness and offers a transferable framework for managing other planthopper pests in tropical and subtropical agriculture.
Overview
The corn planthopper (Peregrinus maidis) is a significant pest of maize and sorghum in tropical and subtropical regions and a particular challenge for seed corn production in Hawaii. This research proposes a novel, sustainable pest management strategy that targets the insect's yeast-like symbionts (YLSs), specialized fungal endosymbionts that play a critical role in nitrogen recycling and amino acid biosynthesis. By silencing key genes within these symbionts, the approach aims to compromise insect fitness, offering an alternative to broad-spectrum chemical controls.
The concept builds on established evidence that multiple planthopper species depend on fungal endosymbionts for essential metabolic functions, and that disrupting these symbionts reduces host fitness. Because the underlying biology is shared across planthopper species, successful control strategies developed for the corn planthopper are expected to be transferable to related pest species, broadening the potential agricultural impact.
Technical specifications
- Target organism: Peregrinus maidis (corn planthopper), with applicability to other planthopper pests
- Mechanism: RNAi-based gene silencing directed at YLS fungal endosymbionts, targeting enzymes involved in amino acid biosynthesis and nitrogen recycling
- Delivery method: Oral delivery via plants treated with microbe-specific morpholinos designed to bind and degrade targeted mRNA transcripts
- Discovery approach: Metagenomic and metatranscriptomic sequencing across different insect life stages to identify and shortlist candidate YLS genes
- Validation metrics: Insect mortality, body length measurements, and progeny size recorded to assess fitness impact
- Validation precedent: Prior lab data confirms YLS presence in the corn planthopper and demonstrates that orally delivered dsRNA is stable and functional in planthoppers
Technology readiness level
This research is at an early discovery and proof-of-concept stage (TRL 2–3). Preliminary transcriptome data has confirmed the presence of YLS-related fungi in the corn planthopper, supporting the biological rationale. The proposed one-year study will generate the first metagenomic and metatranscriptomic datasets for these symbionts, identify target gene candidates, and validate the RNAi approach through controlled fitness assays. Further work will be needed to optimize morpholino design, validate field efficacy, and assess scalability before commercial deployment.
About North Carolina State University
North Carolina State University is a large, comprehensive public land‑grant research university in Raleigh. Its on‑campus research and technology park co‑locates corporate R&D groups, government partners, and faculty labs, enabling shared facilities, prototyping, and agile contracting. Located in North Carolina’s Research Triangle, partners tap a dense regional ecosystem while engaging through a statewide extension network and a mature co‑op program that deliver field deployment and workforce pipelines. Multiple pilot and demonstration facilities support scale‑up and validation toward pre‑commercial readiness. Research is supported by competitive funding from major federal agencies, including NSF, USDA, DOE, and DOD, and a dedicated technology transfer office with clear IP pathways helps accelerate commercialization.
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