alphanecrovirus alphanecrovirus alphanecrovirus is a genus of viruses, in the family tombusviridae. plants serve as natural hosts. there are four species in this genus. alphanecrovirus virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: kitrinoviricota class: tolucaviricetes order: tolivirales family: tombusviridae subfamily: procedovirinae genus: alphanecrovirus taxonomy the genus contains the following species: olive latent virus 1 olive mild mosaic virus potato necrosis virus tobacco necrosis virus a structure viruses in alphanecrovirus are non-enveloped, with icosahedral and spherical geometries, and t=3 symmetry. the diameter is around 28 nm. genomes are linear, around 4kb in length. genusstructuresymmetrycapsidgenomic arrangementgenomic segmentation alphanecrovirusicosahedralt=3non-envelopedlinearmonopartite life cycle viral replication is cytoplasmic. entry into the host cell is achieved by penetration into the host cell. replication follows the positive stranded rna virus replication model. positive stranded rna virus transcription, using the premature termination model of subgenomic rna transcription is the method of transcription. the virus exits the host cell by tubule-guided viral movement. plants serve as the natural host. transmission routes are mechanical, seed borne, and contact. genushost detailstissue tropismentry detailsrelease detailsreplication siteassembly sitetransmission alphanecrovirusplantsnoneviral movement; mechanical inoculationviral movementcytoplasmcytoplasmmechanical: contact; seed