1887

Abstract

SUMMARY

In hybridization experiments, using complementary DNA (cDNA) copies of the two genome parts of tomato black ring virus (TBRV RNA-1 and RNA-2), no sequence homology between the two RNA species was detected.

When tobacco mesophyll protoplasts were inoculated with purified middle component particles, which contain only RNA-2, no replication of TBRV RNA could be detected. However, when they were inoculated with purified bottom component particles, which contain only RNA-1, extracts made 24 or 48 h later contained RNA that had the same mobility as RNA-1 in polyacrylamide-agarose gels, and that hybridized to cDNA copies of RNA-1. Thus RNA-1 can replicate in protoplasts that do not contain RNA-2. Moreover, this RNA-1 was capable, when mixed with nucleoprotein particles containing RNA-2, of inducing the formation of local lesions in leaves, and therefore was intact and attached to the genome-linked protein. The genome-linked protein of nepoviruses is probably virus-coded, and its production in protoplasts inoculated with bottom component particles therefore suggests that RNA-1 contains the gene for this protein.

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1980-12-01
2022-01-24
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