1887

Abstract

Isolates of groundnut rosette umbravirus (GRV) contain a satellite RNA(sat-RNA), about 900 nucleotides (nt) in length, different variants of which are responsible for the symptoms of different forms of rosette disease in groundnuts and, in the particular instance of sat-RNA YB3b, for the production of yellow blotch symptoms in . Sat-RNA YB3b does not affect the accumulation of GRV genomic or subgenomic RNAs in infected plants. Replication of sat-RNA YB3b and induction of yellow blotch symptoms do not require the production of any sat-RNA-encoded proteins. Experiments with deletion mutants identified three functional untranslated elements in sat-RNA YB3b. One (designated R) comprises nt 47–281, is essential for sat-RNA replication and appears to be cis-acting. The other two (designated A and B) comprise nt 280–470 and 629–849, respectively, are both involved in yellow blotch symptom production and can act in . Element A contains the determinant that is unique to sat-RNA YB3b. The process of symptom induction by sat-RNA YB3b apparently involves a novel type of specific interaction of two untranslated RNA elements, which can complement each other, with a host factor or factors.

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1997-06-01
2022-05-29
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