Contribution of uneven distribution of genomic RNA variants of citrus tristeza virus (CTV) within the plant to changes in the viral population following aphid transmission

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Abstract
The population of genomic RNA sequence variants of citrus tristeza virus (CTV) isolates was characterized by single‐strand conformation polymorphism (SSCP) analysis of complementary DNA (cDNA) of the genes p18 and p20. Comparison of field and aphid‐transmitted isolates showed that aphid transmission frequently altered the single‐strand conformation polymorphism (SSCP) pattern of both genes, indicating changes in the population of genomic RNA variants. SSCP analysis of the cDNA of RNA extracted from small pieces of tissue sampled at different sites of the same plant sometimes yielded different patterns, indicating uneven distribution of the genomic RNA variants within the infected plant. Different SSCP patterns were also obtained when the RNA extracted from individual aphids probing in the same infected leaf was used as a template. Uneven distribution of the genomic RNA variants within the infected plant and sorting of some of these variants by individual aphids probably contribute to changes observed in the CTV population following aphid transmission.