The gene in tomato plants is dominant for suppression of mosaic symptoms caused by tobacco mosaic virus isolates designated as tomato strain o. Virus multiplication (measured either by virus RNA content or by virus coat protein content) was inhibited in plants containing . Inhibition was greater in hosts homozygous for (90 to 95%) than in hosts heterozygous for (65 to 75%). Thus, inhibition of tobacco mosaic virus multiplication is gene dosage-dependent; suppression of visible symptoms is not.

Inhibition of TMV RNA accumulation occurred in both directly inoculated and systemically-infected leaves of -containing hosts, and was consistent from experiment to experiment. inhibited accumulation of RNA of different isolates of strain 0 to different extents: two isolates causing yellow mosaic symptoms on susceptible plants were especially strongly inhibited.

In hosts, there was a delay between inoculation and the first detection of virus multiplication, measured either as increase in virus RNA content or recover-able infectivity. The delay was about 8 days in heterozygous hosts and about 16 days in homozygous hosts. The implications of these results for the mode of action of the gene resistance are discussed.


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