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Antigenic Relationships Between Isolates of Mild Dark-Green Tobacco Mosaic Virus, and the Problem of Host-Induced Mutation. C. Wetter, Professor, Department of Botany, University of Saarland, D 66-Saarbrücken, West Germany; Phytopathology 74:1308-1312. Accepted for publication 30 May 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/Phyto-74-1308.

With the exception of one isolate from pepper, many isolates of mild dark-green tobacco mosaic virus (MDGTMV) from different host plants at widely scattered locations of the world could not be distinguished in immunodiffusion tests using eight antisera against different isolates. Eryngium planum was found to be a systemic host of MDGTMV but immune to TMV. By contrast, tomato was found to be a systemic host of TMV but immune to MDGTMV. Experimental results did not support the hypothesis of host-induced mutation from the common strain of TMV into a strain very similar to the U2 strain of MDGTMV.