Summary.
Distinct subgenomic DNA species known as defective (df) DNA molecules were found in plants infected with tomato leaf curl virus (TLCV). Four df DNAs derived from TLCV Type and Darwin 1 strains were found to contain large deletions that disrupt all of the viral genes required for viral replication, encapsidation and spread. However, the viral origin of replication (ori), including the replication-associated protein (Rep) binding domains, was present in all four df DNAs. Co-agroinfection of leaf strips with tandem repeat constructs of the viral and df DNAs resulted in their replication in the presence of the respective TLCV strain. However, the df DNAs failed to move in whole plants when co-inoculated with TLCV. The df DNAs were shown to be associated with TLCV coat protein, which may indicate encapsidation. Mutational analysis showed the minimum sequence requirements for df DNA replication by TLCV to be the intergenic region containing the Rep-binding domains.
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Behjatnia, S., Dry, I. & Rezaian, M. Characterization and transient replication of tomato leaf curl virus defective DNAs. Arch Virol 152, 1127–1138 (2007). https://doi.org/10.1007/s00705-006-0929-2
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DOI: https://doi.org/10.1007/s00705-006-0929-2