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Non-viral Lesions Formed in Non-inoculated Upper Leaves of Local Lesion Hosts Following Inoculation of the Lower Leaves with Tobacco Mosaic Virus

Institute for Plant Virus Research, 959 Aobacho, Chiba, Japan

When the lower leaves of Nicotiana glutinosa or Samsun NN tobacco, local lesion hosts for tobacco mosaic virus (TMV), were inoculated with TMV and kept at 20 °C in continuous light, non-viral lesions began to appear on non-inoculated upper leaves about 8 days later. It is postulated that these non-viral lesions might be induced by substances that move through stem tissues from the inoculated leaves bearing local lesions.

Received 21 October 1974; accepted 15 January 1975.