VIGS-Based Screening for NLR Genes Regulating Viral Effector-Induced Hypersensitive Response

Area of Science:

• Plant immunity
• Molecular genetics
• Biotechnology

Background:

• Nucleotide-binding leucine-rich repeat (NLR) proteins are crucial for plant defense against pathogens, recognizing specific effector proteins and triggering immune responses.
• Improving crop resistance by utilizing NLR genes is economically vital, but traditional identification methods are slow and labor-intensive.
• RNA interference (RNAi) offers sequence-specific gene silencing, providing a potential avenue for efficient gene discovery.

Purpose of the Study:

• To develop and detail a rapid screening protocol for identifying host NLR genes involved in viral effector-activated hypersensitive response (HR).
• To demonstrate the utility of this protocol using a specific viral effector, turnip mosaic virus-coded nuclear inclusion protein a protease (NIa-Pro), in Nicotiana benthamiana.

Main Methods:

• Utilized a tobacco rattle virus-mediated virus-induced gene silencing (VIGS) platform in Nicotiana benthamiana.
• Employed VIGS for high-throughput screening to identify NLR genes mediating HR against viral effectors.
• Focused on the NIa-Pro effector from turnip mosaic virus as a case study.

Main Results:

• Successfully established a VIGS-based screening platform for rapid identification of plant NLR genes.
• Demonstrated the platform's effectiveness in identifying host NLR genes involved in the HR response triggered by the NIa-Pro effector.
• The protocol facilitates faster discovery compared to traditional methods.

Conclusions:

• Virus-induced gene silencing (VIGS) in Nicotiana benthamiana is an efficient strategy for fast identification of host NLR genes involved in plant immunity.
• This method accelerates the discovery of resistance genes, aiding in the development of improved crop varieties.
• The developed protocol offers a valuable tool for plant-pathogen interaction research.