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Natural isolates of Tobacco mild green mosaic virus (TMGMV) fail to infect tomato because the tomato tm-1 protein binds to the replication proteins of TMGMV and prevents RNA replication. Previously, we isolated a TMGMV mutant that overcomes tm-1-mediated resistance and multiplies in tomato plants. Here, we show that the causal mutations in the replication protein gene that abolish the interaction with tm-1 reduce its ability to suppress RNA silencing in host plant Nicotiana benthamiana. The results suggest that the multifunctionality of the replication proteins is an evolutionary constraint of tobamoviruses that restricts their host ranges.

Gaining Replicability in a Nonhost Compromises the Silencing Suppression Activity of Tobacco Mild Green Mosaic Virus in a Host