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Cowpea (Vigna sinensis) seedlings failed to develop tumors after being inoculated with crown gall bacteria (Agrobacterium tumefaciens) if, at times earlier than 1 day later, they were inoculated on the primary leaves with a cowpea mosaic virus that systemically infects them. Inoculation with buffer or with a virus that is restricted to a localized infection, or to which the cowpea is immune, did not interfere with the subsequent development of tumors. The virus infection did not appear to affect directly the titer of A. tumefaciens in the inoculation sites. Nor did mixing of virus particles with A. tumefaciens prevent subsequent appearance of tumors. The influence of virus infection extended across grafts (into tissue that is not susceptible to the virus) and there prevented tumor formation. The sap from infected plants, but not purified virus, decreased tumor formation on carrot disks. Systemic virus infection may induce in cowpeas a translocated substance that prevents tumor induction by A. tumefaciens.

Tumor induction by Agrobacterium tumefaciens prevented in Vigna sinensis seedlings systemically infected by ribonucleic acid viruses