Plant viruses cause considerable economic losses and are a threat for sustainable
agriculture. The frequent emergence of new viral diseases is mainly due to international …

Citrus tristeza virus (CTV)(genus Closterovirus, family Closteroviridae) is the causal agent of
devastating epidemics that changed the course of the citrus industry. Adapted to replicate in …

Superinfection exclusion, a phenomenon in which a preexisting viral infection prevents a
secondary infection with the same or a closely related virus, has been described for various …

Amongst the Closteroviridae, Citrus tristeza virus (CTV) is almost unique in possessing a
number of distinct and characterized strains, isolates of which produce a wide range of …

The severe economic consequences of emerging plant viruses highlights the importance of
studies of plant virus evolution. One question of particular relevance is the extent to which …

Horizontal gene transfer (HGT) is the stable transfer of genetic material from one organism to
another without reproduction or human intervention. Transfer occurs by the passage of …

RNA viruses have a great potential for genetic variation, rapid evolution and adaptation.
Characterization of the genetic variation of viral populations provides relevant information on …

Superinfection exclusion or homologous interference, a phenomenon in which a primary
viral infection prevents a secondary infection with the same or closely related virus, has …

The structure of Potato virus Y (PVY) populations causing potato tuber necrotic ringspot
disease (PTNRD) was analysed. The full-length sequences of the genomic RNAs of five …

Potyviruses have variable single-stranded RNA genomes and many show clear evidence of
recombination. This report studied the distribution of recombination sites in the genomes of …