RNA Silencing Technology
Kartavya Desk Staff
Source: TH
Context: Researchers at Martin Luther University, have developed a highly effective RNA-based antiviral agent against cucumber mosaic virus (CMV), offering strong defence for crops.
About Cucumber Mosaic Virus (CMV):
• What It Is: CMV is a widespread and devastating plant virus affecting over 1,200 plant species including food and medicinal crops.
• Caused By: Transmitted primarily by sap-sucking aphids; nearly 90 species of aphids can spread CMV.
• Impact on Plants: Causes mosaic discoloration, stunted growth, malformed fruits, and severe yield loss (up to 70% in cucurbits).
• India and CMV: In India, CMV causes 25–30% banana crop loss and up to 70% infection in pumpkins, melons, and cucumbers.
About RNA Silencing Technology:
• What It Is?
• RNA silencing is a natural immune mechanism in plants where double-stranded RNA (dsRNA) triggers the production of small interfering RNAs (siRNA) to degrade viral RNA and stop infection.
• RNA silencing is a natural immune mechanism in plants where double-stranded RNA (dsRNA) triggers the production of small interfering RNAs (siRNA) to degrade viral RNA and stop infection.
• How It Works? When a virus infects a plant, it releases double-stranded RNA. The plant detects this as a danger signal. Special enzymes called Dicer-like enzymes then cut the dsRNA into small pieces called siRNA. These siRNAs help the plant identify and destroy the virus’s RNA.
• When a virus infects a plant, it releases double-stranded RNA. The plant detects this as a danger signal.
• Special enzymes called Dicer-like enzymes then cut the dsRNA into small pieces called siRNA.
• These siRNAs help the plant identify and destroy the virus’s RNA.
• Types of RNA-Based Protection:
• Host-Induced Gene Silencing (HIGS): Plants are genetically modified to produce virus-specific dsRNA internally. Offers continuous, lifelong protection but faces regulatory hurdles and higher costs. Spray-Induced Gene Silencing (SIGS): External application of dsRNA sprays without genetic modification. More flexible, environment-friendly, and cost-effective.
• Host-Induced Gene Silencing (HIGS): Plants are genetically modified to produce virus-specific dsRNA internally. Offers continuous, lifelong protection but faces regulatory hurdles and higher costs.
• Plants are genetically modified to produce virus-specific dsRNA internally.
• Offers continuous, lifelong protection but faces regulatory hurdles and higher costs.
• Spray-Induced Gene Silencing (SIGS): External application of dsRNA sprays without genetic modification. More flexible, environment-friendly, and cost-effective.
• External application of dsRNA sprays without genetic modification.
• More flexible, environment-friendly, and cost-effective.
• RNA Silencing Counters CMV:
• Scientists designed “effective dsRNA” enriched with potent siRNA targeting CMV’s genetic weak points. Enhanced immunity led to 80% lower viral loads and near-complete protection in lab experiments.
• Scientists designed “effective dsRNA” enriched with potent siRNA targeting CMV’s genetic weak points.
• Enhanced immunity led to 80% lower viral loads and near-complete protection in lab experiments.
• Significance:
• Precision targeting of virus genomes prevents viral mutation and resistance. Broader application potential for other viral, fungal, and bacterial plant pathogens. Paves way for eco-friendly, GMO-free crop protection technologies.
• Precision targeting of virus genomes prevents viral mutation and resistance.
• Broader application potential for other viral, fungal, and bacterial plant pathogens.
• Paves way for eco-friendly, GMO-free crop protection technologies.