Abstract
Potato virus Y (PVY) and tobacco mosaic virus (TMV) could be adsorbed on hydrated calcium phosphate gel (HCP). When sap from a PVY-infected plant was treated with HCP, a noninfective solution was obtained. This solution contained an antiviral factor, markedly decreasing the infectivity of TMV or PVY. A similar antiviral factor was produced in plants under the stimulus of TMV; this factor was systemically distributed in the plant. The “antiviral factor” was produced in all plants tested that were infected with one of these two viruses; the factor is nonspecific to the host plant to which it is applied.
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