Kousik C S, Ritchie D F
Department of Plant Pathology, North Carolina State University, Raleigh 27695-7616.
Plant Dis. 1998 Feb;82(2):181-186. doi: 10.1094/PDIS.1998.82.2.181.
The effect of major resistance genes (Bs1, Bs2, and Bs3) or gene combinations for resistance to bacterial spot of bell peppers (Xanthomonas campestris pv. vesicatoria) in 15 commercial cultivars on disease reduction and yield were studied during 1995 and 1996. Reaction of cultivars to specific races (races 1, 2, or 3) of the pathogen corresponded with seed company claims for resistance against these races. Races 1 to 4 were used as initial inoculum in 1995, and races 1 to 6 in 1996 field experiments. Cultivars with no known resistance genes to bacterial spot (e.g., Camelot, Jupiter, and Valiant), a single resistance gene (X3R Camelot, King Arthur), or a combination of Bs1 and Bs3 genes (Guardian, Sentinel, and Admiral) were severely diseased. Yields were reduced in all inoculated cultivars compared to non-inoculated cultivars used as controls. Although races 4 and 6 caused significant disease in cultivars with only Bs1 (King Arthur) or Bs2 (X3R Camelot) genes, cultivars with a combination of Bs1 and Bs2 (Boynton Bell, PR9300-8) had much lower levels of bacterial spot. Roger 4178, a hybrid with a combination of Bs1, Bs2, and Bs3 genes, had the lowest disease ratings. Overall, race 3 was predominant during 1995, while races 3 and 6 were recovered most frequently in 1996.
1995年至1996年期间，研究了15个商业栽培品种中主要抗性基因（Bs1、Bs2和Bs3）或基因组合对甜椒细菌性斑点病（野油菜黄单胞菌疮痂病致病变种）的抗病效果及其对产量的影响。各栽培品种对病原菌特定小种（小种1、2或3）的反应与种子公司宣称的对这些小种的抗性相符。1995年田间试验以小种1至4作为初始接种体，1996年则为小种1至6。对细菌性斑点病无已知抗性基因的栽培品种（如Camelot、Jupiter和Valiant）、具有单个抗性基因的品种（X3R Camelot、King Arthur）或具有Bs1和Bs3基因组合的品种（Guardian、Sentinel和Admiral）均严重染病。与用作对照的未接种栽培品种相比，所有接种栽培品种的产量均有所降低。尽管小种4和6在仅具有Bs1（King Arthur）或Bs2（X3R Camelot）基因的栽培品种中引发了严重病害，但具有Bs1和Bs2组合的栽培品种（Boynton Bell、PR9300 - 8）的细菌性斑点病水平要低得多。具有Bs1、Bs2和Bs3基因组合的杂交品种Roger 4178的病害评级最低。总体而言，1995年小种3占主导地位，而1996年最常检测到的是小种3和6。
