ISHS Acta Horticulturae 110: V International Symposium on Virus diseases of Ornamental Plants
ISOLATION OF TWO RHABDOVIRUSES FROM PITTOSPORUM AND PELARGONIUM |
| Authors: | G.L. Rana, A. Di Franco |
| Abstract:
Two rhabdoviruses associated with vein clearing disease of Pittosporum tobira (Thunb.) Ait. (Pittosporum vein clearing virus, PVCV) (Plavšic et al., 1976) and Pelargonium peltatum Ait. (Pelargonium vein clearing virus, PlVCV, isolate PP) (Russo et al., 1979), were successfully transmitted by inoculation of sap from naturally infected plants to herbaceous hosts. PlVCV (isolate PZ) was also obtained from Pelargonium zonale Willd. showing chlorotic vein banding of the leaves (Quacquarelli and Gallitelli, 1980). Both viruses had experimental host range virtually restricted to Solanaceae (several Nicotiana species, Capsicum annuum L., Lycopersicon esculentum Mill., Solanum melongena L., Petunia hybrida Vilm.), in which they caused very similar symptoms. These consisted of chlorotic to yellow (sometimes necrotic) local lesions, extensive yellowing of the veins of non inoculated upper leaves, with curling and puckering of the blades. The only non solanaceous hosts infected were Gomphrena globosa L., which reacted with reddish local lesions to PVCV and both isolates of PlVCV, and Chenopodium amaranticolor Coste et Reyn., which was systemically infected by the two viruses. Expressed sap of N. glutinosa L. infected by PlV-CV-PP lost infectivity at a dilution between 10-5 and 10-6, | |
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