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Differences in Virus-Replicating Capacity Among Plant Species Inoculated with Tobacco Mosaic Virus. P. C. Cheo, Chief, Research Division, Los Angeles State and County Arboretum, Arcadia, California 91006; John S. Gerard, Research Assistant, Research Division, Los Angeles State and County Arboretum, Arcadia, California 91006. Phytopathology 61:1010-1012. Accepted for publication 22 March 1971. DOI: 10.1094/Phyto-61-1010.

Fifty-eight plant species were artificially inoculated with tobacco mosaic virus (TMV). Their virus content was determined by means of spectrophotometric measurement at 260 nm and/or by biological assays on cucumber (Cucumis sativus L. ‘Chicago Pickling’) cotyledons. The results can be classified into 5 categories: I) very susceptible, having a virus content above 1,000 µg TMV/g fresh wt plant tissue, 11 species; II) susceptible, having a virus content from 10 µg to 1,000 µg TMV/g fresh wt plant tissue, 12 species; III) slightly resistant, having a virus content from 0.1 µg to 10 µg TMV/g fresh wt plant tissue, 12 species; IV) subliminally infected, resistant, having a virus content of less than 0.1 µg TMV/g fresh wt plant tissue, 20 species; and V) very resistant, probably immune with no recovery of TMV, 3 species.