부산대학교 도서관

Foot rot disease caused by Phytophthora capsici is a major problem in pepper cultivation in Indonesia and causes rapid plant death. Assembling resistant cultivars through hybridization is one strategy for combating foot rot disease. This study aims to evaluate the hybrid's response to in vitro inoculation with P. capsici isolates. Ten parents, including the wild relative resistance control (Piper colubrinum and P. hirsutum) and 33 hybrids of intra-and interspecific crosses were inoculated with four P. capsici isolates (R11, B37, LP41, K10, and K2) in vitro. The inoculation was performed on detached leaves in the laboratory and incubated at room temperature. Each treatment comprised three leaves and was duplicated thrice. To determine the severity of the disease, lesion size was measured with a leaf area meter 72 hours after inoculation. The results showed that P. colubrinum is highly resistant to all isolates, P. hirsutum, and BBL cultivar is highly resistant to all isolates, except the most virulent K2. Six parental cultivars are resistant to varying degrees to four isolates, but P1 and BBL are particularly highly susceptible to K2. Nine highly resistant hybrids showed improved resistance against their parents. Twelve hybrids showed resistance to highly resistant to all isolates, among them ten are the intervarietal hybrids. These hybrids have the opportunity to be developed as resistant varieties having a broad range of resistance against various isolates. Further tests are needed to confirm the resistance level by testing in vivo and the endemic land, before developing into resistant black pepper varieties. [ABSTRACT FROM AUTHOR]