RNA Silencing

RNA Silencing: According to the U.N. Food and Agriculture Organization (FAO) plant diseases and pests are responsible for nearly 40% of global crop losses, costing over $220 billion annually, with plant viruses contributing more than $30 billion to these losses. Among the most destructive of these viruses is the Cucumber Mosaic Virus (CMV).

• About CMV: Primarily spread by sap-sucking aphids, with nearly 90 species responsible for its transmission.

o Infected plants show mosaic discoloration, stunted growth, malformed fruits, and severe yield loss.

o CMV affects over 1,200 plant species, including key food and medicinal crops.

o CMV causes 25-30% crop loss in bananas and up to 70% yield loss in pumpkins, melons, and cucumbers.

• RNA Silencing in Plant Defense Against CMV: It is a natural immune response in plants where double-stranded RNA (dsRNA) triggers small interfering RNAs (siRNA) to degrade viral RNA. When a virus infects a plant, dsRNA is detected, and Dicer-like enzymes cut it into siRNA, which helps identify and destroy the viral RNA.
• Protection Techniques:

o Host-Induced Gene Silencing (HIGS): Genetically modified plants produce virus-specific dsRNA, in their own cells offering long-term immunity but facing regulatory and cost challenges.