Up-regulation of OEC complex proteins in the BRB-TMV plants, and their downregulation in the the ARB plants may thus relate to the induced defense condition in the BRB-TMV plants. In the TMVi plants the transcriptome was altered much less than in the transgenic BRB and ARB plants. Interestingly, while induction of defense-related genes is not typical to TMVi plants due to the compatible interaction, this reaction was quite opposite in the BRB and ARB transgenic plants. Induced expression of SAR- and HR-associated proteins in the BRB transgenic plants, and their down-regulation after resistance break or virus infection indicates the incompatible host-virus interactions and induction of the active resistance pathways in the BRB plants. This was also indicated by the expression of the non-functional allele of the N-resistance gene and of other Rgenes, observed in the BRB transgenic plants. All these activated defence-related genes and pathways are likely to contribute to the strong TMV resistance condition in the BRB plants. An interesting feature in the transcript profile was the strong down-regulation of the multiple transcripts coding for different components of the translation machinery. The strong reduction of the 40S and 60S Climbazole ribosomal RNAs, and of other ribosomal genes in the BRB plants, compared to their strong upregulation in the TMV infected wt plants, and also to their normal expression in the ARB transgenic plants, suggest that the availability of host translational machinery is actively restricted in the BRB transgenic plants. This may directly suppress the accumulation of viral proteins. Furthermore, the reduction of the eIF3 and eEF1A and eEF1B translation initiation and elongation factors, which are known to be needed for the TMV-specific Beta-Lapachone replicase complex, may, to some extent, directly suppress the TMV replication. Many viruses modify the host translational machinery to increase the viral protein synthesis but not host protein synthesis. In the case of TMV, the viral genomic and coat protein RNAs are stronger translational templates than host mRNAs.