Babuvirus

Babuvirus is a genus of viruses, in the family Nanoviridae.[1] Musa species serve as natural hosts. There are three species in this genus. Diseases associated with this genus include: stunting, severe necrosis and early plant death. BBTV induces banana bunchy top disease (BBTD).[1][2][3]

Babuvirus
Virus classification
(unranked): Virus
Realm: Monodnaviria
Kingdom: Shotokuvirae
Phylum: Cressdnaviricota
Class: Arfiviricetes
Order: Mulpavirales
Family: Nanoviridae
Genus: Babuvirus

Taxonomy

The following species are included in the genus:[3]

  • Abaca bunchy top virus
  • Banana bunchy top virus
  • Cardamom bushy dwarf virus

Structure and genome
Genome map of species Banana bunchy top virus (BBTV) showing six segments.

Viruses in the genus Babuvirus are non-enveloped, with icosahedral and round geometries, and T=1 symmetry. The diameter is around 18-19 nm.

Genomes are multipartite with 6 to 8 circular segments. Genome size is around 81 kb in totsl.[1][2]

GenusStructureSymmetryCapsidGenomic arrangementGenomic segmentation
BabuvirusIcosahedralT=1Non-envelopedCircularSegmented

Life cycle

Viral replication is nuclear. Entry into the host cell is achieved by penetration into the host cell. Replication follows the ssDNA rolling circle model. DNA templated transcription is the method of transcription. The virus exits the host cell by nuclear pore export, and tubule-guided viral movement. Musa species serve as the natural host. The virus is transmitted via a vector (aphids). Transmission routes are vector.[1][2]

GenusHost detailsTissue tropismEntry detailsRelease detailsReplication siteAssembly siteTransmission
BabuvirusPlants: musa speciesPhloemViral movement; mechanical inoculationSecretion; viral movementNucleusNucleusAphids

References
  1. "ICTV Report Nanoviridae".
  2. "Viral Zone". ExPASy. Retrieved 12 June 2015.
  3. "Virus Taxonomy: 2020 Release". International Committee on Taxonomy of Viruses (ICTV). March 2021. Retrieved 12 May 2021.
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