Resistance to Multiple Tuber Diseases Expressed in Somaclonal Variants of the Potato Cultivar Russet Burbank

Table 4

Susceptibility to Rhizoctonia stolon pruning of selected potato cv. Russet Burbank variants in glasshouse (GH1—2010; GH2 and GH3—2011) trials. Rhizoctonia solani AG3 isolates R299, R422, and TAS1 were tested separately in each trial.

Variants	Mean stolon pruning^a—GH1			Mean stolon pruning—GH2			Mean stolon pruning—GH3
	R299 ^b	R422	TAS1	R299	R422	TAS1	R299	R422	TAS1
A380	0.75	0.88	1.25	0.33	0.00	0.33	0.67	0.33	0.33
A168a	2.88	0.88	1.63	—	—	—	—	—	—
TC-RB8	2.00	1.25	0.75	0.00	0.00	0.00	0.33	0.67	1.00
A362	2.50	1.88	2.13	—	—	—	—	—	—
Russet Burbank (parent)	1.50	0.88	1.38	0.33	0.00	0.00	0.67	1.00	1.00
𝑃	0.11	0.47	0.56	0.69	—	0.44	0.79	0.44	0.11
LSD (0.05)	ns	ns	ns	ns	ns	ns	ns	ns	ns

—: lines not tested within the specified trial.
^aStolon pruning disease score—0: no disease, 1: 1 or 2 stolons with lesions, 2: 1 or 2 stolons girdled, 3: 3 stolons girdled, and 4: 4 or more stolons girdled.
^bMeans followed by the same letter within the same column are not significantly different at 𝑃=0.05 using Fisher’s LSD test; ns: non-significant.