Sahin F, Miller S A
Department of Plant Pathology, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster 44691.
Plant Dis. 1998 Jul;82(7):794-799. doi: 10.1094/PDIS.1998.82.7.794.
One hundred seventy Capsicum spp. germplasm accessions were evaluated as potential sources of resistance to X. campestris pv. vesicatoria pepper race 6 (P6). This race has been identified recently in Ohio and overcomes all three known resistance genes in cultivated pepper. Only C. pubescens plant introduction (PI) 235047 was found to be resistant to X. campestris pv. vesicatoria P6 strains using hypersensitivity and pathogenicity tests. Further studies using PI 235047 as a differential line showed that strains classified as X. campestris pv. vesicatoria races P1 and P3 were heterogeneous in terms of virulence. Strains of X. campestris pv. vesicatoria P1 and P3 that were compatible with PI 235047 were reclassified as two new pepper races, designated X. campestris pv. vesicatoria P7 and P8, respectively. According to the new race classification, PI 235047 plants are incompatible with X. campestris pv. vesicatoria pepper races P0, P1, P3, P4, and P6, but compatible with races P2, P5, P7, and P8.
对170份辣椒属种质资源进行了评估，以确定其作为对野油菜黄单胞菌辣椒致病变种6号小种（P6）的潜在抗性来源。该小种最近在俄亥俄州被发现，能克服栽培辣椒中所有已知的三个抗性基因。通过过敏反应和致病性测试，仅发现毛辣椒植株引进种（PI）235047对野油菜黄单胞菌辣椒致病变种P6菌株具有抗性。使用PI 235047作为鉴别品系的进一步研究表明，被归类为野油菜黄单胞菌辣椒致病变种P1和P3的菌株在毒力方面具有异质性。与PI 235047相容的野油菜黄单胞菌辣椒致病变种P1和P3菌株被重新归类为两个新的辣椒小种，分别命名为野油菜黄单胞菌辣椒致病变种P7和P8。根据新的小种分类，PI 235047植株与野油菜黄单胞菌辣椒致病变种P0、P1、P3、P4和P6不相容，但与P2、P5、P7和P8小种相容。
