Identification of a defective molecule derived from DNA-A of the bipartite begomovirus of East African cassava mosaic virus

Geminivirus defective interfering DNAs arise spontaneously in mechanically inoculated test plants, and have previously been found with DNA‐B of the bipartite cassava mosaic geminiviruses, but not DNA‐A. Reported here for the first time is the cloning and characterization of a naturally occurring tru...

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Bibliographic Details
Published in:Plant pathology 2006-02, Vol.55 (1), p.2-10
Main Authors: Ndunguru, J, Legg, J.P, Fofana, I.B.F, Aveling, T.A.S, Thompson, G, Fauquet, C.M
Format: Article
Language:English
Subjects:
Begomovirus
Biological and medical sciences
cassava
cassava mosaic geminivirus
defective (df)DNA
DNA‐A
EACMV
East African cassava mosaic virus
Fundamental and applied biological sciences. Psychology
Geminivirus
helper viruses
Manihot esculenta
molecular sequence data
Nicotiana benthamiana
nucleotide sequences
open reading frames
phylogeny
Phytopathology. Animal pests. Plant and forest protection
plant viruses
Plant viruses and viroids
polymerase chain reaction
Tanzania
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Summary:Geminivirus defective interfering DNAs arise spontaneously in mechanically inoculated test plants, and have previously been found with DNA‐B of the bipartite cassava mosaic geminiviruses, but not DNA‐A. Reported here for the first time is the cloning and characterization of a naturally occurring truncated form of cassava mosaic geminivirus DNA‐A, which at 1525 nt is around half the expected full size. Sequence analysis has shown it to be a defective (df) form of East African cassava mosaic virus (EACMV) DNA‐A that has retained its cis elements essential for replication by the helper virus, and it has been termed df DNA‐A 15. Phylogenetic comparisons placed the df DNA‐A 15 molecule close to mild and severe isolates of EACMV‐UG2. Biolistic inoculation of Nicotiana benthamiana with infectious df DNA‐A 15 clone and East African cassava mosaic Cameroon virus (EACMCV) resulted in symptom amelioration as compared with EACMCV singly inoculated plants, and there was an accumulation of df DNA‐A 15 in systemically infected leaves. In addition, the level of EACMV DNA‐B accumulation was reduced in the coinoculated plants compared with those inoculated with EACMCV alone. PCR and sequence analysis confirmed the helper virus as EACMV.
ISSN:0032-0862
1365-3059
DOI:10.1111/j.1365-3059.2005.01289.x