1887

Abstract

Full-length cDNA to RNA 1, RNA 2 and RNA 3 of cucumber mosaic virus strain Q (CMV-Q) was amplified using the polymerase chain reaction (PCR). The first-strand primer contained a HI site and sequences complementary to the 3′ terminus of the RNA, The second-strand primers contained a HI site, a T7 promoter and sequences corresponding to the 5′ terminus of each RNA. After cleavage with HI, the PCR products were cloned into the HI site of the vector pEMBL9(+). Five clones of each RNA were selected and RNA transcripts were synthesized from each clone using T7 RNA polymerase. The constructs were designed to allow transcription to initiate precisely at the 5′ terminus of each RNA. All the transcripts were found to be infectious when inoculated onto cv. Samsun plants in sets of three, corresponding to RNA 1, RNA 2 and RNA 3. Of the transcript sets, four induced symptoms indistinguishable from symptoms induced by CMV-Q RNAs. However a fifth transcript set induced much more severe symptoms. Plasmids were also constructed to allow synthesis of transcripts with one or two additional G residues at the 5′ terminus of each RNA. Although the yields of such transcripts synthesized with T7 RNA polymerase were higher, their infectivity was lower than that of those with no additional residues at their 5′ termini.

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1990-11-01
2022-01-26
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