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ISHS Acta Horticulturae 901: XII International Symposium on Virus Diseases of Ornamental Plants

POTENTIAL IMPACT AND RISKS OF ENDOGENOUS PLANT VIRUSES IN CULTIVATION OF PETUNIA ILLUSTRATED BY ENDOGENOUS PETUNIA VEIN CLEARING (PARARETRO-) VIRUS (EPVCV)

Authors:   F. Noreen, T. Schwarzacher, R. Akbergenov, G. Harper, T. Hohn, K.R. Richert-Pöggeler
Keywords:   Petunia, Petunia vein clearing virus (PVCV), endogenous plant pararetroviruses (EPRV), tissue culture, induction of EPRV
Abstract:
Cultivation of ornamental crops is dominated by vegetative propagation and tissue culture. Both technologies have been found to induce endogenous plant para-retroviruses (EPRVs, reviewed by Staginnus and Richert-Pöggeler, 2006). Their exogenous counterparts, the plant pararetroviruses, belong to the family of Caulimoviridae that comprise dsDNA viruses and that replicate through an RNA intermediate. Caulimoviridae consist of 6 genera: Caulimo-, Cavemo-, Petu- and Soymoviruses with isometric particles and Badna- and Tungroviruses with bacilliform particles. Integrated sequences with homology to Caulimo-, Cavemo-, Petu-, Badna- and Tungroviruses have been found in their respective host plants.
We use as a model system for our studies the type member of the genus Petuvirus, Petunia vein clearing virus (PVCV) and its natural host Petunia. An overview on current knowledge of PVCV and its endogenous forms (Staginnus et al., 2009) with regard to virus transmission and replication, and its relevance for Petunia cultivation and breeding is presented.
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