The four RNA species of a French strain of beet necrotic yellow vein virus (BNYVV) have lengths of 7100, 4800, 1800 and 1500 nucleotides, as measured by agarose gel electrophoresis in denaturing conditions. Translation of purified RNA in a reticulocyte cell-free system revealed that RNA-2 encodes the 22000 mol. wt. coat protein. Cloned cDNA copies of each of the four viral RNA species have been used to show that BNYVV RNA-3 and RNA-4 share no sequence homology with RNA-1 and RNA-2. Thus, RNA-3 and RNA-4 cannot be subgenomic messengers derived from the larger RNA species.

Keyword(s): BNYVV , cDNA , sequence homology and translation

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