Virus Inclusions Formed by the PM2 Mutant of TMV

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Abstract
Plants infected with the flavum or the ni-118 strain of TMV contain electron-dense cytoplasmic X-bodies (Kolehmainen, Zech & Von Wettstein, 1965; Kassanis & Milne, 1971), whereas plants infected with the type strain do not. Strain ni-118 produces insoluble coat protein, especially in infected plants that are kept at temperatures above 30° (Jockusch, 1966; Kassanis & Bastow, 1971), and it is possible that the X-bodies contain this protein. We thought that information about the nature of the X-bodies might be obtained by comparing the behaviour of the two variants of pm 2 only one of which forms insoluble coat protein. pm 2 was originally obtained by treating type TMV with nitrous acid and produces a defective protein unable to coat its RNA (Siegel, Zaitlin & Sehgal, 1962). The original pm 2 has a soluble protein, but a variant, isolated at Rothamsted from it, from a single local lesion, produces insoluble coat protein (Kassanis & Bastow, 1971).

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