Sugarcane bacilliform viruses
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Author(s): R. Viswanathan, ICAR-SBI, Coimbatore, India
Source: Viruses, 2016, vol. 8 (6) no. 177
Sugarcane bacilliform viruses (SCBV)
These viruses are widely distributed in sugarcane growing regions, causing yield losses in some cultivars. The symptoms are variable and depend on the susceptibility of the sugarcane cultivar. Severe symptoms include chlorotic mottling, stunting and freckles. However, many infected plants are symptomless. Apart from sugarcane, the viruses can infect other members of the Poaceae family like rice, sorghum, Johnsongrass and Panicum. Transmission occurs through mealybugs (e.g. Sacharicoccus sachhari) and infected cuttings.
The viruses have a circular and double-stranded DNA genome with 7.5 - 8 kilobase pairs. Several phylogenic groups of the viruses have been described, based on their DNA sequences. Some strains show close serological relationship to the Banana streak viruses. The following viruses are recognized by the ICTV and have been assigned to species of the genus Badnavirus:
• sugarcane bacilliform Guadeloupe A virus (SCBGAV) - assigned to the species Badnavirus alphasacchari
• sugarcane bacilliform Guadeloupe D virus (SCBGDV) - assigned to the species Badnavirus betasasacchari
• sugarcane bacilliform IM virus - assigned to the species (SCBIMV) Badnavirus gammasacchari
• sugarcane bacilliform MO virus - assigned to the species (SCBMOV) Badnavirus deltasacchari
