SUMMARY 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.
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Fraser et al. (1980) studied this question.
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