Small RNAs as systemic signals in plant defense: mechanisms, challenges, and future directions.
Wekesa C, Kiprotich K, Muoma J, Mithöfer A
Plant Signaling
PubMedThe tomatoes and wheat in your grocery store may soon be protected not by synthetic chemicals, but by a precisely targeted RNA spray that disarms the fungus attacking the crop while leaving everything else untouched.
Plants have a hidden communication system made of tiny molecular messengers that travel through their internal 'veins' to switch genes on or off — including genes in attacking fungi and molds. Scientists have figured out how these messengers move and stay stable, and are now engineering them as crop protection tools you can literally spray on plants. This could lead to safer, more targeted alternatives to traditional pesticides.
Key Findings
Small RNAs travel long distances through plant tissue via plasmodesmata and the phloem, enabling whole-plant immune coordination rather than only local cell-level responses.
Cross-kingdom RNA interference (ckRNAi) allows plant-derived RNAs to silence genes inside fungal and oomycete pathogens, forming the basis of two crop-protection strategies: Host-Induced Gene Silencing (HIGS) and Spray-Induced Gene Silencing (SIGS).
Key delivery challenges — including environmental RNA degradation and inconsistent uptake by different pathogens — are being addressed through nanocarriers, synthetic biology, and machine-learning design tools.
chevron_right Technical Summary
Plants use tiny molecular signals called small RNAs to coordinate defenses across their entire body and even fire them like weapons into attacking fungi and other pathogens. Researchers are now harnessing this natural system to develop spray-on RNA treatments that could replace or reduce chemical pesticides in farming.
Abstract Preview
Small RNAs (sRNAs) have emerged as central regulators of gene expression, coordinating development, stress responses, and immunity across plant tissues. Far from acting solely within individual cel...
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