Abstract
Bacterial wilt, which is a serious problem for Solanaceae crops, is caused by Ralstonia solanacearum (Smith, 1896) Yabuuchi et al. 1995. To protect against this disease, planting a resistant cultivar and using biological pest control have been considered effective. However, because the trait of resistance to bacterial wilt is assumed to be influenced by multiple genes, selective breeding of the resistant cultivar is very difficult. Therefore, we attempted to breed a new rootstock cultivar with resistance to pepper bacterial wilt disease. First we carried out inoculating test to the resistant line (MZC-180) and six newly inbred potential lines (Shikou Nos. 1–6). Inoculation test with R. solanacearum race 2-d showed MZC-180 and its six breeding lines possessed obviously higher resistance to the disease than the sweet pepper cultivar used for comparison. Furthermore, MZC-180 and Shikou Nos. 3, 4, 5 and 6 showed higher resistance than the resistant rootstock cultivar of sweet pepper ‘Daisuke’. On inoculation tests with five strains of the disease, MZC-180 and Shikou Nos. 3, 4, 5 and 6 also showed higher resistance than ‘Daisuke’ to all strains. In comparison with several Solanaceous plants, MZC-180 and Shikou No. 3 showed higher resistance than all the other tested plants.
