Alphanecrovirus

Alphanecrovirus is a genus of viruses, in the family Tombusviridae. Plants serve as natural hosts. There are four species in this genus.^[1][2]

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, listed by scientific name and followed by their common names:^[2]

• Alphanecrovirus nicotianae, Tobacco necrosis virus A
• Alphanecrovirus oleae, Olive latent virus 1
• Alphanecrovirus solani, Potato necrosis virus
• Alphanecrovirus tessellati, Olive mild mosaic virus

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.^[1]

Genus	Structure	Symmetry	Capsid	Genomic arrangement	Genomic segmentation
Alphanecrovirus	Icosahedral	T=3	Non-enveloped	Linear	Monopartite

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.^[1]

Genus	Host details	Tissue tropism	Entry details	Release details	Replication site	Assembly site	Transmission
Alphanecrovirus	Plants	None	Viral movement; mechanical inoculation	Viral movement	Cytoplasm	Cytoplasm	Mechanical: contact; seed