RNA-dependent RNA polymerase activities in tomato plants susceptible or resistant to tobacco mosaic virus
1985
Evans, D.M.A. | Fraser, R.S.S. | Bryant, J.A.
RNA-dependent RNA polymerase activities were measured in healthy and tobacco mosaic virus (TMV)-infected tomato plants, to investigate the possibility that altered activity might be involved in the operation of the Tm-I gene for resistance to TMV. Healthy, susceptible and resistant plants had similar levels of enzyme activity. Infection with TMV strain 0, which is inhibited by Tm-I, caused a 2-fold increase in activity in susceptible plants but no increase in Tm-I plants. Infection with a number of strain 1 isolates, which overcome Tm-I resistance, led to a 2 to 4-fold increase in enzyme activity in resistant plants.
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