Antigenic Relationships Between Isolates of Mild Dark-Green Tobacco Mosaic Virus, and the Problem of Host-Induced Mutation

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Abstract
With the exception of 1 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 8 antisera against different isolates, Eryngium planum was a systemic host of MDGTMV, but immune to TMV. By contrast, tomato was 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.