1887

Abstract

Sequence comparison of a non-biologically active full-length cDNA clone of (ORSV) pOT1 with a biologically active ORSV cDNA clone pOT2 revealed a single nucleotide change of T→C at position 211. This resulted in the change of Phe50 in OT2 to Ser50 in OT1. It was not the nucleotide but the amino acid change of Phe50 that was responsible for the inability of OT1 to replicate. Time-course experiments showed that no minus-strand RNA synthesis was detected in mutants with a Phe50 substitution. Corresponding mutants in (TMV) showed identical results, suggesting that Phe50 may play an important role in replication in all tobamoviruses. Complementation of a full-length mutant OT1 was demonstrated in a co-infected local-lesion host, a systemic host and protoplasts by replication-competent mutants tORSV.GFP or tORSV.GFPm, and further confirmed by co-inoculation using tOT1.GFP+tORSV (TTC), suggesting that ORSV contains no RNA sequence inhibitory to replication . Surprisingly, a small number of exact revertants were detected in plants inoculated with tOT1+tORSV.GFPm or tOT1.GFP+tORSV (TTC). No recombination was detected after screening of silent markers in virus progeny extracted from total RNA or viral RNA from inoculated and upper non-inoculated leaves as well as from transfected protoplasts. Exact reversion from TCT (OT1) to TTT (OT2), rather than recombination, restored its replication function in co-inoculated leaves of .

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2004-08-01
2019-11-19
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