The Simultaneous Transmission of a Plant-Pathogenic Bacterium and a Virus From Rose by Grafting and Mechanical Inoculation

Abstract

Fulton (1952) reported the transmission of rose mosaic virus (RMV) by mechanical inoculation from Rosa setigera Michx. to cucumber and thereafter to other herbaceous plants. This made possible the characterization of the virus, and later, its purification (Fulton 1967). In South Australia we have been unable to transmit viruses from rose leaves, flowers, or roots by mechanical inoculation directly to herbaceous plants. However, we have transmitted several virus isolates by patchbark grafting rose material to young peach seedlings and then mechanically transmitting virus from young peach leaves to cucumber seedlings (Basit and Francki, unpublished data). From at least one rose plant we have consistently isolated two pathogens via peach seedlings to cucumber seedlings, both of which were at first thought to be viruses but later one of the pathogens was identified as a species of Pseudomonas.