Nitzan Nadav, Cummings Tom F, Johnson Dennis A, Miller Jeff S, Batchelor Dallas L, Olsen Chris, Quick Richard A, Brown Charles R
USDA-ARS, Prosser, WA 99350.
Washington State University, Pullman, WA 99164.
Plant Dis. 2008 Dec;92(12):1643-1649. doi: 10.1094/PDIS-92-12-1643.
Potato (Solanum tuberosum) selections (clones and commercial cultivars) were examined for resistance to root galling, caused by the powdery scab pathogen Spongospora subterranea f. sp. subterranea in seven field trials conducted between 2003 and 2007 in the states of Washington and Idaho. Four industry reference cultivars-Shepody, Russet Burbank, Russet Ranger, and Umatilla Russet-were used as susceptible standards. Every year, selections less susceptible than the standards were considered resistant and progressed to the next season. Selections that did not demonstrate resistance in at least two consecutive trials were discarded. Eight potato selections were more resistant to root galling than the susceptible standards in two or more trials: PA98NM38-1 was more resistant than the susceptible standards in 5 of 5 trials, PO94A009-10 in 4 of 5 trials, PA95B2-4 and PA98N5-2 in 3 of 5 trials, POR00HG5-1 in 2 of 5 trials, PO94A009-7 in 3 of 4 trials, PO94A012-2 in 2 of 3 trials, and Summit Russet in 2 of 2 trials. POR00HG5-1 has Solanum hougasii in its ancestry, while the other selections have the Mexican wild species Solanum bulbocastanum and the commercial cultivar Summit Russet appearing in their ancestry. Summit Russet is the most plausible source of resistance.
在2003年至2007年于华盛顿州和爱达荷州进行的七次田间试验中，对马铃薯（Solanum tuberosum）的选系（无性系和商业品种）进行了抗根瘤病研究，该病由粉状疮痂病病原菌Spongospora subterranea f. sp. subterranea引起。选用了四个行业参考品种——谢泼蒂、褐皮伯班克、褐皮游侠和尤马蒂拉褐皮——作为感病对照品种。每年，比对照品种感病程度低的选系被视为抗病品种，并进入下一季试验。在至少连续两次试验中未表现出抗性的选系被淘汰。八个马铃薯选系在两次或更多次试验中比感病对照品种更抗根瘤病：PA98NM38 - 1在5次试验中的5次比感病对照品种更抗病，PO94A009 - 10在5次试验中的4次，PA95B2 - 4和PA98N5 - 2在5次试验中的3次，POR00HG5 - 1在5次试验中的2次，PO94A009 - 7在4次试验中的3次，PO94A012 - 2在3次试验中的2次，以及Summit Russet在2次试验中的2次。POR00HG5 - 1的谱系中有Solanum hougasii，而其他选系的谱系中出现了墨西哥野生种Solanum bulbocastanum和商业品种Summit Russet。Summit Russet是最有可能的抗性来源。
