Cm. Hayden et al., VIRION PROTEIN-SEQUENCE VARIATION AMONG AUSTRALIAN ISOLATES OF TURNIPYELLOW MOSAIC TYMOVIRUS, Archives of virology, 143(1), 1998, pp. 191-201
The virion protein genes, and 3' untranslated regions, of six variants
of turnip yellow mosaic tymovirus (TYMV) that produced different symp
toms in their native host Cardamine robusta and in Chinese cabbage pla
nts, have been sequenced. The sequences have been compared with each o
ther, and with the same region of the pBL-16 clone of the Blue Lake is
olate of TYMV. The sequences of the virion protein genes differed by a
mean of 1.89% (range 0-2.82%), and the encoded proteins by a mean of
1.71% (range 0-3.17%). The nucleotide differences were confined to the
5'-most 60% of the gene, whereas there were amino acid differences on
ly among residues 12 to 29 and residue 102 (numbered from the N-termin
us) of the virion protein involving only hydrophobic residues at the s
urface of the protein. The amino acid and nucleotide differences betwe
en the seven isolates did not correlate with differences in the sympto
ms they caused, but confirmed earlier estimates of genetic variability
in the wild populations of the virus.