genes from three or more plant species were nested in different clades, suggesting different evolutionary patterns between these two gene types. Non-TIR-NBS-encoding genes were poly- or paraphyletic, i.e. In addition, we observed extensive species-specific expansion in TIR-NBS-encoding genes. duplication and recombination could serve to generate novel resistance specificities. These duplication events, together with a higher probability of recombination revealed in this study, could compensate for the longer generation time in woody perennial species e.g. These results suggested that recent tandem duplication played a major role in NBS-encoding gene expansion in perennial species. Consequently, we observed higher nucleotide identity among paralogs and a higher percentage of NBS-encoding genes positioned in numerous clusters in the grapevine and poplar. We found significant excesses of recent duplications in perennial species, compared with those of annuals, represented by rice and Arabidopsis. We subsequently investigated protein motif composition, phylogenetic relationships and physical locations. Here, we identified 459 and 330 respective NBS-LRRs in grapevine and poplar genomes. However, in woody species, little is known about the evolutionary history of these genes. Most disease resistance genes in plants encode NBS-LRR proteins.
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