The transcriptomics of an experimentally evolved plant-virus interaction

Area of Science:

• Plant pathology
• Molecular biology
• Genetics

Background:

• Plant-virus interactions are often modeled based on gene-for-gene resistance and virulence.
• Previous research evolved tobacco etch potyvirus (TEV) on Arabidopsis thaliana ecotypes, yielding specialist and generalist lineages.

Purpose of the Study:

• To investigate the transcriptomic underpinnings of plant-virus interactions.
• To characterize the differential gene expression in five Arabidopsis thaliana ecotypes upon infection with ancestral and evolved TEV.

Main Methods:

• Transcriptomic profiling of five Arabidopsis thaliana ecotypes infected with ancestral and evolved TEV lineages.
• Differential gene expression analysis to identify plant responses to local and evolved viral isolates.

Main Results:

• Plant transcriptomic responses to TEV infection were heterogeneous across ecotypes but showed parallelism in lineages evolved within the same ecotype.
• Beyond immune genes, other functional categories were significantly altered, indicating broader plant responses to viral adaptation.
• Specialist TEV lineages induced divergent transcriptomic perturbations and activated plant defense, while generalist lineages caused similar perturbations and down-regulated defenses.

Conclusions:

• Plant resistance genes are not the sole drivers of viral adaptation; broader transcriptomic changes are involved.
• The transcriptomic impact of TEV specialists and generalists differs significantly across Arabidopsis thaliana ecotypes.
• Viral specialization influences plant defense activation, with specialists upregulating and generalists downregulating defense mechanisms.