A variable region of the sugarcane bacilliform virus (SCBV) genome can be used to generate promoters for transgene expression in sugarcane.

Four promoters derived from sugarcane bacilliform virus (SCBV) were compared and characterised. Three were obtained by PCR amplification of purified virion DNA extracted from three sugarcane cultivars. The fourth promoter was obtained by subcloning from an almost genome-length clone of SCBV. All promoters were able to drive stable expression of beta-glucuronidase in sugarcane. The PCR-derived promoter sequences shared more DNA homology with banana streak virus than to the subcloned SCBV. The subcloned promoter was the strongest expressing and was able to drive reporter gene expression in vitro and in the leaves, meristems and roots of glasshouse-grown sugarcane. Expression levels were at least equal to or higher than those measured for the maize polyubiquitin promoter.