Allopolyploidy and the evolution of plant virus resistance

Table 2 Grapevine fanleaf virus and Tomato ringspot virus resistance ratings of Nicotiana species and synthetic allopolyploids

Section^a	Origin	x=	*Nicotiana*species	GFLV-GHu^b	GFLV-F13^c	ToRSV-AP
Tomentosae	Bolivia	12	N. otophora	5	2	3
	Bolivia	12	N. tomentosiformis	2	2
	Bolivia	12	N. kawakamii	2		3
	Peru	12	N. setchelii	3		3
Paniculatae	Peru	12	N. paniculata	3	1
Noctiflorae	Bolivia	12	N. glauca	2
Sylvestres	Bolivia	12	N. sylvestris	2
Undulatae	Peru	12	N. glutinosa	3
Trigonophyllae	SW US	12	N. obtusifolia	2
Petunioides	SW US	12	N. attenuata	6
Suaveolentes	Australia	16	N. suaveolens	5
	Australia	19	N. benthamiana	6	6	6
	Australia	20	N. goodspeedii	6
	Australia	24	N. debneyi	4	2
Polydicliae	SW US	24	N. clevelandii	6	6
Rusticae	Bolivia	24	N. rustica	4
Nicotiana	Domesticated	24	N. tabacum	2	1 or 2	3
Wide crosses (synthetic allopolyploids)		24	4x(N. sylvestris x N. otophora)	3	1	3
		24	4x(N. sylvestris x N. tomentosiformis)	3	1	3
		36	4x(N. glutinosa x N. tabacum)	3	1
		43	2x(N. tabacum x N. benthamiana)	4	3	5
		48	4x(N. quadrivalvis x N. tabacum)	3	3	6
		48	4x(N. rustica x N. tabacum)	4	2	3
		48	4x(N. debneyi x N. clevelandii)	5	4

^aSpecies and synthetic allopolyploids are referenced by their sections within the genus Nicotiana, primary location of origin, and their haploid chromosome numbers according to [10].
^bCategories of resistance (1, most resistant, through 6, most susceptible) are indicated for each virus-host combination tested.
^cBoxes without resistance ratings represent virus-host combination not tested.

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