Sugarcane yellow leaf virus: a novel member of the Luteoviridae that probably arose by inter-species recombination.
The 5895 nucleotide long single-stranded RNA genome of Sugarcane yellow leaf virus Florida isolate (SCYLV-F) includes six major ORFs. All but the first of these are homologous to genes of known function encoded by viruses of the three newly defined genera in the LUTEOVIRIDAE: ('luteovirids'), i.e. poleroviruses, luccccteoviruses and the enamoviruses. SCYLV-F ORFs 1 and 2 are most closely related to their polerovirus counterparts, whereas SCYLV-F ORFs 3 and 4 are most closely related to counterparts in luteovirus genomes, and SCYLV-F ORF5 is most closely related to the read-through protein gene of the only known enamovirus. These differences in affinity result from inter-species recombination. Two recombination sites in the genome of SCYLV-F map to the same genomic locations as previously described recombinations involving other luteovirids. A fourth type of luteovirid, Soybean dwarf virus, has already been described. Our analyses indicate that SCYLV-F represents a distinct fifth type.
Smith
G R
GR
David North Plant Research Centre, Bureau of Sugar Experiment Stations, PO Box 86, Q 4068 Indooroopilly, Australia. GSmith@bses.org.ua
Borg
Z
Z
Lockhart
B E
BE
Braithwaite
K S
KS
Gibbs
M J
MJ
D001483:Base Sequence; D017793:Luteovirus / Q000145:classification* / Q000235:genetics; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D010802:Phylogeny; D011995:Recombination, Genetic