| Group II (ssDNA)|
| Curtovirus, Topocuvirus, Geminiviridae, Maize streak virus, Begomovirus|
Mastrevirus is a genus of viruses, in the family Geminiviridae. Mostly monocotyledonous plants serve as natural hosts. There are currently 29 species in this genus including the type species Maize streak virus. Diseases associated with this genus include: maize streak virus: maize streak disease (MSD).
Viruses in Mastrevirus are non-enveloped, with icosahedral geometries, and T=1 symmetry. The diameter is around 22 nm, with a length of 38 nm. Genomes are circular and non-segmented, around 2.6-2.8kb in length.
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. Mostly monocotyledonous plants serve as the natural host. The virus is transmitted via a vector (leafhopper). Transmission routes are vector and mechanical.