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J Gen Virol 78 (1997), 2347-2353
© 1997 Society for General Microbiology
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Journal of General Virology, Vol 78, 2347-2353, Copyright © 1997 by Society for General Microbiology

ARTICLES

Infectious cDNA clone used to identify strawberry mild yellow edge- associated potexvirus as causal agent of the disease

S Lamprecht and W Jelkmann
Federal Biological Research Centre for Agriculture and Forestry, Institute for Plant Protection in Fruit Crops, Dossenheim, Federal Republic of Germany.

A full-length in vivo infectious cDNA clone of strawberry mild yellow edge-associated potexvirus (SMYEaV) was constructed and used to inoculate Fragaria vesca 'Alpine' seedlings and Rubus rosifollus. Both host plants could be infected using particle bombardment or agroinoculation, but not by mechanical inoculation. A method that used potted strawberry plants for particle bombardment resulted in high survival and infection rates. The plants developed systemic infection and virus particles were detected by ELISA and immunoelectron microscopy. Mechanical inoculation of Chenopodium quinoa and C. foetidum with the 35S construct resulted in localized infections. F. vesca 'Alpine' indicator plants produced symptoms that were indistinguishable from control plants inoculated with a naturally occurring isolate of strawberry mild yellow edge by graft or aphid transmission. These results suggest that SMYE potexvirus is the causal agent of strawberry mild yellow edge disease. As this virus is capable of causing the disease, we propose the name strawberry mild yellow edge potexvirus, with the acronym SMYEPV, to replace the name strawberry mild yellow edge-associated potexvirus.


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