Striking differences in biological and molecular properties between onion and garlic isolates of Onion yellow dwarf virus

MARCOS GIOVANI CELLI; ADA KARINA TORRICO; MIRTA KIEHR; VILMA CECILIA CONCI

ARCHIVES OF VIROLOGY

SPRINGER WIEN

Lugar: Viena; Año: 2013 vol. 158 p. 1377 - 1382

0304-8608

Complete nucleotide (nt) and deduced amino acid sequences of two Onion yellow dwarf virus (OYDV) isolates showing mild and severe symptoms in onion but being unable to infect garlic were determined. The genomes consisted of 10459 and 10461 nt [without 3´ poly(A) tail] and were 92.2% identical. Comparison of their whole genomes, polyproteins and P1, HC-Pro, P3, CI, VPg and NIa-Pro regions with those of garlic isolates previously identified as OYDV gave percentage values below those proposed as molecular threshold for potyvirus species demarcation. This and the striking differences in host range between onion and garlic isolates suggest that they represent different virus species.