Sugarcane yellow leaf virus: a novel member of the Luteoviridae that probably arose by inter-species recombination

Author:

Smith Grant R.12,Borg Zara12,Lockhart Ben E. L.3,Braithwaite Kathryn S.12,Gibbs Mark J.4

Affiliation:

1. Cooperative Research Centre for Tropical Plant Pathology, The University of Queensland, Q 4070 St Lucia, Australia2

2. David North Plant Research Centre, Bureau of Sugar Experiment Stations, PO Box 86, Q 4068 Indooroopilly, Australia1

3. Department of Plant Pathology, University of Minnesota, MN 55108 St Paul, USA3

4. Research School of Biological Sciences, Australian National University, GPO Box 475, ACT 2601 Canberra, Australia4

Abstract

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.

Publisher

Microbiology Society

Subject

Microbiology

Reference21 articles.

1. Gapped BLAST and PSI-BLAST: a new generation of protein database search programs;Altschul;Nucleic Acids Research,1997

2. Notes on the occurrence of yellow leaf syndrome of sugarcane in southern Africa;Bailey;Proceedings of the South African Sugar Technologists Association,1996

3. Applying motif and profile searches;Bork;Methods in Enzymology,1996

4. Yellow leaf syndrome appears on the United States mainland;Comstock;Sugar Journal,1994

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