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Resistance to Tobacco Mosaic Virus in Tomato: Effects of the Tm-1 Gene on Symptom Formation and Multiplication of Virus Strain 1

Biochemistry Section National Vegetable Research Station Wellesbourne, Warwick CV35 9EF, U.K.

The Tm-1 gene in tomato inhibits development of mosaic symptoms and multiplication of tobacco mosaic virus (strain o isolates). A virus isolate of strain 1 type caused mosaic symptoms on Tm-1 hosts almost as severe as those it caused on susceptible hosts. However, multiplication of strain 1 virus (measured as accumulation of virus RNA or coat protein) was still partly inhibited in Tm-1 hosts. Thus the two end effects of the Tm-1 gene were to some extent separable.

^* Present address: Department of Biological Sciences, Lanchester Polytechnic, Coventry, U.K.

Received 12 February 1980; accepted 1 April 1980.