Host-induced gene silencing platform for rice disease resistance using cross-kingdom small RNA transport
Transgenic rice platform leveraging Host-induced Gene Silencing (HIGS) to produce small RNAs that target essential fungal genes, conferring resistance against Magnaporthe oryzae (rice blast). Validated transgenic lines show 30–80% lesion reduction. Research explores extracellular vesicle-mediated cross-kingdom RNA transport between plant and fungal cells.
Overview
Rice blast disease, caused by the fungal pathogen Magnaporthe oryzae, is one of the most destructive diseases affecting global rice production. This research delivers a transgenic rice platform built on Host-induced Gene Silencing (HIGS), in which the plant itself produces small silencing RNAs that travel into invading fungal cells and suppress essential fungal genes. The approach has already produced homozygous transgenic rice lines that exhibit dramatic disease resistance, with lesion sizes reduced by 30% to 80% compared to wild-type plants.
The work goes beyond conventional disease resistance strategies by investigating cross-kingdom RNA transport via extracellular vesicles. Understanding how small RNAs move between plant and fungal cells opens new avenues for durable crop protection and provides fundamental insight into plant–pathogen communication.
Technical specifications
Core technology:
- HIGS transgenic rice lines expressing small silencing RNAs targeting eight conserved essential genes in Magnaporthe oryzae
- Validated targets: Three of eight candidate genes confirmed as effective HIGS targets, with corresponding reduction in fungal gene expression confirmed by real-time quantitative PCR
- Cross-kingdom transport validation: Synthesized small RNAs applied to fungal mycelium produced measurable growth reduction, supporting the vesicle-mediated transport mechanism
- Extracellular vesicle analysis: Ongoing isolation and small RNA sequencing of vesicles from both transgenic rice and M. oryzae to map the complete small RNA profile involved in inter-kingdom signaling
Key applications:
- Rice blast disease resistance in commercial rice cultivars
- Platform for identifying conserved essential gene targets in other fungal pathogens
- Foundation for cross-kingdom RNA transport research in additional crop–pathogen systems
Technology readiness level
The HIGS transgenic rice lines have been generated and validated through pathogen challenge assays, demonstrating consistent disease resistance phenotypes and confirmed suppression of fungal target gene expression. Current technology readiness is at the transgenic line validation stage, with strong proof-of-concept data in hand. The next phase involves small RNA sequencing of extracellular vesicles to fully characterize the cross-kingdom transport mechanism and identify the complete profile of mobile silencing RNAs. This positions the platform for further field evaluation and potential trait introgression into elite rice breeding lines.
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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