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Comparative Studies on Two Strains of Tobacco Rattle Virus

Department of Plant Pathology, University of California, Riverside, California, U.S.A.

Differences in symptom expression and growth curve exist between two California strains, B and C of tobacco rattle virus, each of which possesses 3 components of different particle lengths and is serologically related to two English strains. With increasing age of infection from 3 to 35 days, the particle populations of strains B and C show a shift in the middle to bottom component ratio from about 2 to 0·9. An unstable 1600 to 1700 Å fraction recovered during periods of most rapid synthesis of the strain C may be implicated in the appearance of normally present 800 to 900 Å rods.

Received 26 August 1966; accepted 2 November 1966.