Peach asteroid spot (PAS) and peach sooty ringspot (PSRS) are two diseases of stone fruit trees of unknown aetiology. The use of a cRNA probe of the newly described Apricot latent virus (ApLV), a tentative member of the Foveavirus genus, indicated the presence of cross-hybridizing agents in PAS isolate LA2 and in PSRS isolates Caserta 12 and Clava J4. Analysis of dsRNA patterns revealed in each case the presence of a major dsRNA band of about 9.6 kbp. The purified dsRNAs were used to obtain cDNA clones for isolates LA2 and Caserta 12. Sequence analysis of a 1.1 kbp cDNA clone from isolate LA2 showed very high homology with the known ApLV sequence, indicating that this isolate represents a closely related variant of ApLV. Sequence analysis of a 3.06 kbp Caserta 12 cDNA clone representing the 3′ region of the genome revealed a genomic organization similar to that reported for other members of the Foveavirus genus, including the triple gene block and a large, 43.6 kDa coat protein. Sequence comparison with the CP gene of ApLV, the only sequenced region so far for this virus, showed an overall homology of 78%. These results indicate that the foveavirus represented by the Caserta 12 isolate of PSRS disease may be regarded as a distant variant of ApLV. The present results indicate that the viral agents associated with peach asteroid spot and peach sooty ringspot diseases might be variants of the recently described ApLV.
Archives of Virology – Springer Journals
Published: Aug 1, 2001
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