Virus-induced gene silencing in rice using a vector derived from a DNA virus

Area of Science:

• Plant Molecular Biology
• Virology
• Genetics

Background:

• Virus-induced gene silencing (VIGS) offers rapid, transient gene silencing in plants using viral vectors.
• Developing effective VIGS vectors is crucial for functional genomics in crop plants like rice.

Purpose of the Study:

• To construct and characterize a novel VIGS vector for gene silencing in rice.
• To demonstrate the efficacy of the VIGS vector for targeted gene knockdown in rice.

Main Methods:

• A VIGS vector (pRTBV-MVIGS) was engineered from Rice tungro bacilliform virus (RTBV) DNA.
• The vector incorporated a constitutive promoter, reverse transcription elements, and a multi-cloning site.
• Agrobacterium-mediated inoculation (agroinoculation) was used to introduce the vector into rice plants.

Main Results:

• The engineered RTBV-based VIGS vector successfully accumulated in rice plants.
• Agroinoculated rice plants exhibited visible silencing phenotypes (white streaks) in leaves.
• Real-time PCR confirmed significant reduction (60-90%) in target gene (pds) transcript levels in silenced tissues.

Conclusions:

• The study reports the first VIGS vector for rice that can be introduced via agroinoculation.
• The developed VIGS vector is effective for transient gene silencing in rice, facilitating functional gene studies.