Reference R-Genes, manually curated
(Li Y, Tessaro MJ, Li X, Zhang Y. Regulation of the expression of plant resistance gene SNC1 by a protein with a conserved BAT2 domain. Plant Physiol. 2010 Jul;153(3):1425-34 PMID:20439546)
R-genes have been isolated from a variety of plants. R-genes encode for resistance proteins (R-proteins), a class of proteins that activate signaling cascade to promote the initial plant defense responses to impair pathogen devlopment. R-proteins would be expressed in healthy plants to ready detect an external attack. R-proteins are characterized by rapid evolution of specificity, a mechanism leading to an effective response to the regular evolution of pathogens and resist to new virulent pathogens.
(Hammond-Kosack KE, Jones JD.PLANT DISEASE RESISTANCE GENES. Annu Rev Plant Physiol Plant Mol Biol. 1997 Jun;48:575-607. PMID:15012275)
Generally, R-genes share homologous functional domains and can occur either as isolated genes or (as commonly occurs) as tandem clusters.
(de Meaux J, Mitchell-Olds T. Evolution of plant resistance at the molecular level: ecological context of species interactions. Heredity (Edinb). 2003 Oct;91(4):345-52. PMID:14512948)
In PRG database is published a R-gene list