Potato Virus Y Restricts Alternaria solani Growth During Co-Infection

Area of Science:

• Plant pathology
• Microbial ecology
• Virology

Background:

• Plant phyllosphere harbors diverse microbes interacting and influencing plant health.
• Understanding molecular mechanisms of plant-microbe interactions is crucial for crop protection.
• Multiple pathogen infections are common in crops, affecting disease dynamics.

Purpose of the Study:

• Investigate the interaction between potato virus Y (PVY) and the early blight fungus Alternaria solani in potato.
• Elucidate the molecular mechanisms underlying PVY's effect on A. solani infection.
• Assess the ecological role of viruses in modulating plant disease outbreaks.

Main Methods:

• Infection assays with PVY and A. solani on potato plants.
• Phenotypic analysis of fungal growth on infected and non-infected plant tissues and media.
• RNA sequencing (RNAseq) to analyze gene expression in both potato and A. solani.

Main Results:

• PVY infection significantly limited the expansion of necrotic lesions caused by A. solani.
• Reduced fungal growth phenotype persisted even when transferred to artificial media.
• RNAseq revealed down-regulation of A. solani pathogenicity genes and altered plant ethylene-responsive defenses in the presence of PVY.

Conclusions:

• PVY influences A. solani virulence by suppressing fungal pathogenicity and altering host defense mechanisms.
• This study highlights the complex ecological interactions between viruses and fungi in plant pathosystems.
• Viruses can act as significant ecological factors influencing the severity of plant diseases.