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Possible emergence of new geminiviruses by frequent recombination.
TLDR
Geminiviruses are a group of plant viruses characterized by a genome of circular single-stranded DNA encapsidated in twinned quasi-isometric particles and recombination is very frequent and occurs between species and within and across genera.
A Receptor Kinase-Like Protein Encoded by the Rice Disease Resistance Gene, Xa21
TLDR
The sequence of the predicted protein, which carries both a leucine-rich repeat motif and a serine-threonine kinase-like domain, suggests a role in cell surface recognition of a pathogen ligand and subsequent activation of an intracellular defense response.
Geminivirus strain demarcation and nomenclature
TLDR
The status of geminivirus species and strain demarcation is reviewed as well as providing updated isolate descriptors for a total of 672 begomovirus isolates, and several others previously classified as “strains” have been upgraded to “species”.
Molecular criteria for genus and species discrimination within the family Potyviridae
TLDR
A phylogenetic analysis of the optimised nucleotide (nt) alignment of the entire ORFs of each fully-sequenced species in the family Potyviridae provided strong support for several subgroups within the genus Potyvirus, suggesting that the continuum of variation that is theoretically available is constrained or disrupted by molecular barriers that must have some biological significance.
Classification and Nomenclature of Viruses
The results of the meetings of the International Committee on Taxonomy of Viruses, held in Madrid, September 1975, are briefly reported: rules of viral nomenclature, composition of the new Executive
Recombination, pseudorecombination and synergism of geminiviruses are determinant keys to the epidemic of severe cassava mosaic disease in Uganda.
TLDR
Analysis of naturally infected cassava plants showed various assortments of DNA-A and DNA-B of the Ugandan viruses, suggesting the occurrence of natural inter- and intraspecies pseudorecombinations and a pattern of cassava mosaic disease (CMD) more complex than previously reported.
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