Identification of NB-LRR gene family in Capsicum annuum

The the nucleotide binding and leucine-rich repeat (NB-LRR) are the majority of resistance genes, comprising the hundreds in plant genome. The NB-LRR gene family has been studied extensively to unravel the role of their function and evolution in plants. Here, the diversity of NB-LRR genes was investigated in the Capsicum annuum ‘CM334’ draft genome sequence. We performed a conserved NB domain based search of the annotated pepper genome and identified 486 NB-LRR type genes among the 35,269 pepper gene models. Based on our pipeline, 74 were TNL type contain an N-terminal toll/interleukin 1 receptor (TIR)-like domain, 708 were non-TNL type and some of them contain an N-terminal coiled-coil (CC) domain. The physical and genetic map positions of those NB-LRR genes were assigned to the pepper pseudo-chromosome molecules. Comparative genomics studies on evolution and function of NB-LRR genes in Solanaceous genomes is on progress. These data could provide a major source of candidates for improving defense mechanism and understanding R gene evolution and diversity in pepper and other Solanaceae species.