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When tobacco mosaic virus (TMV) and potato virus X (PVX) preparations were mixed with the sap from the halo zone (HZ) tissues surrounding homologous virus-induced local lesions in Datura stramonium and Gomphrena globosa leaves, respectively, and the mixtures were incubated for 18 h at 37 °C, the virus particles underwent destruction. Under the electron microscope abnormal (swollen and “thin”) virions were observed in the incubated virus preparations negatively stained with phosphotungstic acid. Sometimes the TMV particles were “cut” across into fragments. Treatment of the virus preparations with the sap from the healthy leaves or HZ surrounding heterologous virus-induced local lesions may cause certain destructive changes of virus particles but to a far lesser extent than treatment with the sap from the homologous virus-induced HZ. Possible mechanisms of destruction of the virus particles are discussed

Destruction of TMV and PVX caused by sap from the halo zones surrounding homologous virus-induced local lesions in leaves of host plants