Table 1 List of dominant R genes against plant viruses, their protein structure, and corresponding avirulence factors

R gene	Host*	Pathogen†	Avr factor‡	Predicted domains§	Reference
N	N. tabacum	TMV	Helicase	TIR-NBS-LRR	Whitham et al., 1994(8)
HRT	A. thaliana	TCV	CP	CC-NBS-LRR	Cooley et al., 2000(9)
RCY1	A. thaliana	CMV	CP	CC-NBS-LRR	Takahashi et al., 2002(10)
RTM1	A. thaliana	TEV	-¶	Jacaline-like	Chisholm et al., 2000(11)
RTM2	A. thaliana	TEV	-	Small HSP-like	Whitham et al., 1994(8)
Rχ1	S. tuberosum	PVX	CP	CC-NBS-LRR	Bendahmane et al., 1999(12)
Rχ2	S. tuberosum	PVX	CP	CC-NBS-LRR	Bendahmane et al., 2000(13)
Nb	S. tuberosum	PVX	MP	-	Marano et al., 2002(14)
Nytbr	S. tuberosum	PVY	-	-	Celebi-Toprak et al., 2002(15)
Ry	S. tuberosum	PVY	NIaPro	-	Mestre et al., 2003(16)
Sw-5	L. esculentum	TSWV	-	CC-NBS-LRR	Brommonschenkel et al., 2000(17)
Tm-1	L. esculentum	ToMV	RdPp	-	Meshi et al., 1988(18)
Tm-2	L. esculentum	ToMV	MP	CC-NBS-LRR	Lanfermeijer et al., 2005(19)
Tm-22	L. esculentum	ToMV	MP	CC-NBS-LRR	Lanfermeijer et al., 2005(19)
Rsv1	G. max	SMV	HC-pro and P3	CC-NBS-LRR	Hayes et al., 2004(20)

^{*A. thaliana, Arabidopsis thaliana; N. tabavum, Nicotiana tabacum; S. tuberosum, Solanum tuberosum; L. esculentum, Lycopersicum esculentum; G. max, Glycine max.
†}TCV, Turnip crinkle virus; CMV, Cucumber mosaic virus; TMV, Tobacco mosaic virus; PVX, Potato virus X; PVY, Potato virus Y; TSWV, Tomato spooted wilt virus; ToMV, Tomato mosaic virus; SMV, Soybean mosaic virus; TEV, Tobacco etch virus.
^‡CP, coat protein; MP, movement protein; RdRp, RNA dependent RNA polymerase; NIaPro, protease domain of unclear inclusion; HC-Pro, helper component protease.
^§TIR-NBS-LRR, Toll-interleukin-1 receptor-nucleotide binding site-leucine-rich repeat; CC-NBS-LRR, coiled coil-nucleotide binding site-leucine-rich repeat; HSP, heat shock protein
^¶Not Known.