But two PepMV strains in the United States show a distinct divergence from the European varieties.
PepMV strains, he observed a strong similarity to the South American strains.
In contrast, South American and European PepMV strains did not exhibit
The strain of PepMV that's currently found in the United States was probably introduced accidentally into North America by tomato seeds produced in Chile.
Ling also observed that tomato plants developed milder symptoms after infection with Chilean strains of PepMV than after exposure to the European strains.
Plants that developed no symptoms and showed little to no detectable levels of PepMV virus accumulation were saved for their seeds and for additional resistance tests.