Complete genome sequence of a putative new caulimovirus which exists as endogenous pararetroviral sequences in Angelica dahurica.

A virus isolate designated Angelica bushy stunt virus (AnBSV), provisionally representing a new species in the genus Caulimovirus, was discovered in the medicinal plant Angelica dahurica. The complete 8,300-nt genomic DNA of AnBSV had seven putative open reading frames containing conserved domains/motifs, which are typical features of caulimoviruses, and showed the greatest nucleotide sequence identity (74% identity and 27% query coverage) to a lamium leaf distortion virus isolate. Interestingly, the new caulimovirus exists as endogenous pararetroviral sequences in the host plant and is considered to have multiple defective plant genome-integrated copies that may lead to the generation of subgenomic DNA species.

Identification and characterization of a new virus in the genus Potyvirus from wild populations of Angelica lucida L. and A. genuflexa Nutt., family Apiaceae.

A novel potyvirus was discovered in Angelica lucida L. (wild celery) and A. genuflexa Nutt. (kneeling Angelica) (family Apiaceae) in the Matanuska- Susitna Valley, Alaska. The experimental plant host range of the virus included species in three families: Chenopodiaceae (Chenopodium amaranticolor Coste et Reyn and Chenopodium quinoa Willd.), Solanaceae (Nicotiana benthamiana Domin, and N. clevlandii Gray.), and Apiaceae (Anethum graveolens L., Apium graveolens L. var. dulce (Miller)), Daucus carota L. subspecies sativus (Hoffm.) Arcang., and Petroselinum crispum (Miller) Nyman ex A. W. Hilland). The virus contained flexuous rods with an ssRNA genome approximately 9.5-10 k nts and a CP ( approximately 35 kDa) that reacted to a universal potyvirus monoclonal antibody in Western blot analysis. The sequenced genomic 3'-end ( approximately 1850 nt) contained a potyvirus genomic arrangement that included the 3'-terminus of the NIb (nuclear inclusion) gene, the CP (coat protein) gene, and a 3'-UTR (untranslated region) attached to a poly(A)tail. The CP amino acids had between 54 and 70% identity with 12 selected members from the genus Potyvirus. Phylogenetically, the Alaskan potyvirus clustered with three other apiaceous potyviruses from Australia. The novel Alaskan virus was confined to A. lucida L. and A. genuflexa Nutt. in nature, and was classified in the genus Potyvirus, family Potyviridae, and in part named after its natural plant hosts, angelica virus Y (AnVY).