alexa Factors contributing to deletion within Mungbean yellow mosaic virus partial dimers in binary vectors used for agroinoculation.
Microbiology

Microbiology

Journal of Plant Pathology & Microbiology

Author(s): Shivaprasad PV, Thomas M, Balamani V, Biswas D, Vanitharani R,

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Abstract Mungbean yellow mosaic virus-Vigna (MYMV) sequences cloned as partial dimers within the T-DNA of a binary vector were deleted at a high frequency upon conjugal mobilization from Escherichia coli into Agrobacterium tumefaciens. This deletion involving the genome-length viral DNA did not occur when the binary plasmid was inside E. coli and when the binary plasmid was introduced into Agrobacterium by electroporation. Deletions occurred in both DNA A and DNA B partial dimers. A minimum of 500-nt continuity on either side of the nonanucleotide in the duplicated common region is required for deletion. A. tumefaciens cells in which deletion was complete, grew as larger colonies reflecting a growth advantage. The small, slow-growing colonies eventually lost the genome-length viral sequences after a few more cycles of growth. Partial dimers in binary plasmids pGA472 and pBin19 with RK2 replicon underwent deletion while those in pPZP with pVS1 replicon did not undergo deletion. Deletion was observed in A. tumefaciens strains C58, A136, A348 and A281 with C58 chromosome background, but not in Ach5 and T37. Interestingly, deletion did not occur in A. tumefaciens strain AGL1 with a recA mutation in C58 chromosome, implying a clear role for recombination in deletion. These observations suggest the choice of Agrobacterium strains and binary vectors for agroinoculation of geminiviruses. This article was published in J Virol Methods and referenced in Journal of Plant Pathology & Microbiology

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