Journal of Taiwan Agricultural Research

Author:Chien-Yih Lin, Shiow-Huey Hseu, San-Tai Wang, Shing-Jy Tsao, Jyh-Hemg Yen, and Chi-Hsiung Hsiao

Abstract:

    Two sets of pepper materials, totally 123 cultivars or lines, were screened for their resistance to bacterial wilt caused by Ralstonia solanacearum using a leaf-clip inoculation method. The first set of tested materials included 13 local commercial cultivars and 22 TARI inbreeding lines, which were all hot pepper type. Among them, the disease index of the lowest was 11.4% and the highest was 100%. The number of cultivars or lines rated as highly resistant, resistant, susceptible and highly susceptible were 2, 19, 11, and 3, respectively. The two highly resistant peppers were the inbreeding lines: ‘4207-5-37-4-2-2-5’ and ‘4207-16-45-2-2-1-1’, and the three highly susceptible peppers were all commercial varieties: ‘Long Chili’, ‘New Comer’, and ‘Hungariana’. However, the commercial varieties, ‘Smatra’, ‘Hot Beauty’, ‘Delicacy’, ‘Avon Eg’, and ‘Ever Flavor’ showed resistance. The ratios of highly resistant, resistant, susceptible and highly susceptible among TARI inbreeding lines were 9.2, 63.6, 27.2, and 0%, respectively and the commercial varieties were 0, 38.5, 38.5, and 23%, respectively. This indicated that the TARI inbreeding lines were more resistant to bacterial wilt than the commercial varieties. The second set of tested materials were samples obtained from the Office of Plant Germplasm totally including 88 cultivars or lines of sweet and hot pepper types. Among these materials, the lowest disease index was 1.4% and the highest was 90.0%. The number of cultivars or lines rated as highly resistant, resistant, susceptible and highly susceptible were 28, 27, 26, and 7, respectively. The seven highly susceptible varieties (lines) were all sweet pepper type and the 28 highly resistant cultivars (lines) were all belonged to hot peppers.

Key words:Capsicum spp., bacterial wilt, resistance screening, Ralstonia solanacearum

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