Resistance to Phytophthora capsici, Restorer-of-fertility Genotype for Cytoplasmic Male Sterility and Chemical Quality Components of Breeding Lines Developed for Improvement of Subicho, a Land Race of Pepper in Yeongyang

Over the last 25 years, a breeding line of pepper (Capsicum spp.) PVR Subi has been bredby the introduction of the Phytophthora capsici resistance found in pepper line PI201234 andthe field resistance to viruses found in pepper accession KC00406 into a small-fruited, earlymaturing,and good-tasting land race, Subicho, in Yeongyang. In 2009, PVR Subi was crossedwith a new version of Subi (New Subi) and an accession, KC01522, with mild and good dryfruit quality. This was done to meet growers’ demands for larger-fruited, open-pollinated localcultivars adapted to conditions in the Subi area of Yeongyang. Twenty-nine F5 and 37 F6 linesthat developed from the two crosses were evaluated for resistance to P. capsici by pathogeninoculation at the seedling stage. Selected lines were grown to record horticultural charactersin F5 and to analyze chemical quality components such as capsaicinoids, sugar and color in F6. Most of the breeding lines carried pathogen resistance comparable with the commercial resistanthybrid control cultivar, ‘Baerota’, and many lines were found to contain higher capsaicinoid andsugar levels, as well as ASTA color value, than the commercial control. All the breeding lineswere identified as restorer-of-fertility lines with N(S)RfRf genotype, producing stable malefertile F1 plants in crosses with a cytoplasmic male sterile line (CMS). These breeding linesare promising as basic materials for selection of open-pollinated cultivars adapted to grow inYeongyang, and as pollen parents for a hybrid seed production system using cytoplasmic malesterility. KCI Citation Count: 2