1887

Abstract

A full-length cDNA clone of the RNA genome of the cucurbit potyvirus zucchini yellow mosaic virus (ZYMV) was constructed downstream from a bacteriophage T7 RNA polymerase promoter. A single extra guanosine residue not present in ZYMV RNA was added to the 5′ and 3′ ends. Capped (mGpppG) ZYMV RNA transcripts were infectious in 10 of 91 test plants; uncapped RNA transcripts were not infectious. The appearance of symptoms in plants inoculated with the infectious transcript was delayed for more than a week compared to plants inoculated with native viral RNA. The progeny virions recovered from infected plants had the same biological properties (aphid non-transmissibility and typical symptoms) as the parental virus. The progeny virions also reacted positively with ZYMV antiserum and ZYMV-specific probes by dot blot hybridization. The authenticity of the progeny virus was verified by identifying a specific molecular marker (C substituted for T in the 3′ non-coding region) using nucleotide sequence analysis.

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1991-11-01
2021-10-19
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