Fig. 4

Emergence and evolution of L and R3a genes in the pepper and potato genomes. Models for the evolution of L and R3a in the pepper and potato are depicted. The gene names in the R3a cluster are from the previous analysis of Huang et al. [33]. The model proposes that L and R3a gene ancestors were first created by retroduplication, followed by the accumulation of point mutations and tandem duplication, respectively. DNA sequence indicative of a poly(A) tail and flanking terminal repeat (TR) sequences are depicted in the diagram as genomic evidence for a retroduplicated origin of L