Abstract
When an isolate of tobacco mosaic virus (TMV) strain 0, uniquely labelled with a genetic marker governing symptom expression, was used to infect the susceptible component of an intergrafted pair of susceptible (Tm-0/Tm-0) and resistant (Tm-2/+) tomato plants, the virus moved through the graft union and established a systemic infection in the Tm-2/+ component. Subsequently, a new virus identified as TMV strain 2 was detected in the resistant plant. Since the new virus also possessed the genetic marker which characterized the original inoculum, it is inferred that the new strain did not preexist but was derived from the parent virus during host passage.
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