A cellular gene as a double surveillance agent for plant to combat pathogen

Area of Science:

• Plant Pathology
• Molecular Plant-Microbe Interactions
• Plant Immunity

Background:

• The tomato extreme resistance (R) gene, encoding the Tm2/Tm22 protein, confers resistance to tobamoviruses via hypersensitive response (HR).
• This R-gene-mediated resistance involves interaction with the tobamovirus movement protein (MP).

Purpose of the Study:

• To elucidate the role of the cellular gene RbCS in tobamovirus resistance.
• To investigate the interaction between RbCS and the tobamovirus movement protein (MP).
• To understand how RbCS influences both local and systemic viral infections.

Main Methods:

• Analysis of R-gene mediated resistance pathways.
• Investigation of protein-protein interactions between RbCS and tobamovirus MP.
• Assessment of viral infection phenotypes (local vs. systemic) in plants with varying RbCS function.

Main Results:

• A functional RbCS protein is required for R-gene-mediated local resistance by interacting with MP and restricting local infection.
• The interaction between RbCS and MP is also crucial for enabling tobamovirus systemic infection.
• Loss-of-function mutations in RbCS permit local infection but abolish systemic spread.

Conclusions:

• The cellular gene RbCS functions as a dual surveillance agent, controlling both local and systemic phases of tobamovirus infection.
• This dual role of RbCS represents a previously unrecognized plant defense strategy against viral pathogens.
• Understanding RbCS function provides insights into plant immunity and potential strategies for crop protection.