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Evidence that DNA-A of a geminivirus associated with severe cassava mosaic disease in Uganda has arisen by interspecific recombination.
UgV isolates were detected in severely mosaic-affected plants from all 11 widely separated locations sampled, and the probable role of recombination in geminivirus evolution in the short to medium term is discussed.
A similarity between viral defense and gene silencing in plants.
It was found that nepovirus infection of nontransgenic plants induces a resistance mechanism that is similar to transgene-induced gene silencing.
Virology division news: Revision of taxonomic criteria for species demarcation in the family Geminiviridae, and an updated list of begomovirus species
Members of the family Geminiviridae characteristically have circular single-stranded DNAgenomes packaged within twinned (so-called geminate) particles that cause yield losses to many crop plants throughout the world.
Role of a novel type of double infection in the geminivirus‐induced epidemic of severe cassava mosaic in Uganda
The evidence indicates that UgV is probably of relatively recent origin, that such variants do not appear often, and that the current epidemic has resulted from the rapid spread of UgV to infect plants and to invade regions in which ACMV already occurred.
Nucleotide sequence evidence for the occurrence of three distinct whitefly-transmitted geminiviruses in cassava.
The differences between ACMV-K, ACMv-M and ICMV are considered great enough to justify their separation as isolates of three distinct WTGs: African cassava mosaic virus, East African cassva mosaic virus and Indian cassava mosa virus.
Four DNA-A variants among Pakistani isolates of cotton leaf curl virus and their affinities to DNA-A of geminivirus isolates from okra.
Complete DNA-A sequences of nine Pakistani geminivirus isolates from leaf curl-affected cotton (CLCuV-PK) or from okra, and the partial sequences of several additional isolates were determined, suggesting that recombination had occurred and that the origin of replication was a favoured recombination site.
Detection and differentiation of whitefly-transmitted geminiviruses in plants and vector insects by the polymerase chain reaction with degenerate primers
Summary Degenerate oligonucleotide primers, designed for amplification of an approx. 500 bp fragment of DNA-A of five well characterised whitefly-transmitted geminiviruses, were used in the…
Virus variation in relation to resistance-breaking in plants
- B. Harrison
- 1 March 2002
The ability to identify, and potentially to create, durable virus resistance is increasing steadily, and the type of resistance and number of resistance genes to be overcome are increasing steadily.