Dioscorea bacilliform viruses
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Dioscorea bacilliform viruses (DBVs)
These badnaviruses have been reported from the Americas and Africa. They infect various species of yam, causing reduced tuber yield and quality. Symptoms include leaf chlorosis and internal brown spotting in the tubers. Transmission has been demonstrated mechanically and through the mealybug Planococcus citri. The DNA genome has a size of around 7415 bp.
The Dioscorea bacilliform viruses have been shown to belong to a complex of several closely related species of badnaviruses. Various names have been used for the members of this complex which are no longer recognized by taxonomists, for example 'Dioscorea alata bacilliform virus' or 'Dioscorea sansibarensis bacilliform virus'. The Dioscorea bacilliform viruses belong to the genus Badnavirus and as of 2023, 8 have been assigned to species. These include:
- Dioscorea bacilliform AL virus (DBALV) - assigned to Badnavirus alphadioscoreae
- Dioscorea bacilliform AL virus 2 (DBALV2) - assigned to Badnavirus betadioscoreae
- Dioscorea bacilliform RT virus 1 (DBRTV1) - assigned to Badnavirus deltadioscoreae
- Dioscorea bacilliform RT virus 2 (DBRTV2) - assigned to Badnavirus epsilondioscoreae
- Dioscorea bacilliform SN virus (DBSNV) - assigned to Badnavirus etadioscoreae
- Dioscorea bacilliform TR virus (DBTRV) - assigned to Badnavirus tetadioscoreae
