Elsevier

Virology

Volume 336, Issue 2, 5 June 2005, Pages 240-250
Virology

Poinsettia latent virus is not a cryptic virus, but a natural polerovirus–sobemovirus hybrid

https://doi.org/10.1016/j.virol.2005.03.020Get rights and content
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Abstract

The biochemical and genetic features of Poinsettia latent virus (PnLV, formerly named Poinsettia cryptic virus), which is spread worldwide in commercial cultivars of Euphorbia pulcherrima without inducing symptoms, have been determined using virus-purification, immunological techniques, electron microscopy, cloning, and sequencing. PnLV was found to be a chimeric virus with one 4652 bases, plus strand RNA showing a close relationship to poleroviruses within the first three quarters of its genome but to sobemoviruses in the last quarter. Thus, we propose to classify this virus as “polemovirus”. Similarities of protein and nucleic acid sequences at the 5′ and extreme 3′ end of its RNA suggest a replication mode like that of poleroviruses, whereas the coat protein sequence is closely related to that of sobemoviruses. Consistent with these results, PnLV forms stable icosahedra of 34 nm in diameter. The consequences for the taxonomy of PnLV and for gardeners' practice are discussed.

Keywords

Virus
Taxonomy
Cloning
Recombination

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