topocuvirus topocuvirus topocuvirus is a genus of viruses, in the family geminiviridae. dicotyledonous plants serve as natural hosts. there is only one species in this genus: tomato pseudo-curly top virus. diseases associated with this genus include: vein swelling, curling of the leaves and leaf distortion. topocuvirus virus classification (unranked): virus realm: monodnaviria kingdom: shotokuvirae phylum: cressdnaviricota class: repensiviricetes order: geplafuvirales family: geminiviridae genus: topocuvirus structure viruses in topocuvirus 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 2.86kb in length. genusstructuresymmetrycapsidgenomic arrangementgenomic segmentation topocuvirustwinned icosahedralincomplete t=1non-envelopedcircularmonopartite 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. dicotyledonous plants serve as the natural host. the virus is transmitted via a vector (treehopper). transmission routes are vector. genushost detailstissue tropismentry detailsrelease detailsreplication siteassembly sitetransmission topocuvirusdicotyledonous plantsnonecell receptor endocytosisbuddingnucleusnucleusleafhopper