Abstract
Potato virus Y (PVY) is the most economically important virus affecting potato production. PVY manipulates the plant cell machinery in order to successfully complete the infecting cycle. On the other side, the plant activates a sophisticated multilayer immune defense response to combat viral infection. The balance between these mechanisms, depending on the plant genotype and environment, results in a specific outcome that can be resistance, sensitivity, or tolerance. In this review, we summarize and compare the current knowledge on molecular events, leading to different phenotypic outcomes in response to PVY and try to link them with the known molecular mechanisms.
Highlights
Potato virus Y (PVY) is the most economically important virus affecting potato production worldwide [1]
The virions have the RNA genome encapsidated by multiple copies of the coat protein (CP) and covalently linked at the 50 end to the viral protein genome-linked (VPg)
The high-resolution cryoelectron microscopy structure of the PVY virions was recently determined and it showed a left-handed helical arrangement of CPs assembled around viral single-stranded RNA (ssRNA)
Summary
Potato virus Y (PVY) is the most economically important virus affecting potato production worldwide [1]. This plasticity might explain the multifunctional nature of the CP This viral structural protein is involved in several steps of virus infection, including assembly, replication and translation, cell-to-cell movement, and long-distance transport [7,8,9]. (1) Viral hijacking of host factors required for efficient infection, (2) mechanisms of plant defense, Viruses 2020, 12, 217; doi:10.3390/v12020217 www.mdpi.com/journal/viruses. The balance between these plant defense, and (3)ofmechanisms of viral counterdefense, to circumvent defense. The defense response restricts the viral multiplication and/or infected leaves [12]). ER, HR, tolerant, and susceptibility responses are natural S-gene mediated resistance known.mediated resistance is currently known
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