title: Evaluation of Resistance to Ralstonia solanacearum in Tomato Genetic Resources at Seedling Stage.
abstract: Bacterial wilt of tomatoes caused by Ralstonia solanacearum is a devastating disease that limits the production of tomato in Korea. The best way to control this disease is using genetically resistant tomato plant. The resistance degree to R. solanacearum was evaluated for 285 tomato accessions conserved in the National Agrobiodiversity Center of Rural Development Administration. These accessions of tomato were originated from 23 countries. Disease severity of tomato accessions was investigated from 7 days to 14 days at an interval of 7 days after inoculation of R. solanacearum under greenhouse conditions. A total of 279 accessions of tomato germplasm were susceptible to R. solanacearum, resulting in wilt and death in 70 to 90% of these plants. Two tomato accessions were moderately resistant to R. solanacearum. Only four accessions showed high resistance against R. solanacearum. No distinct symptom of bacterial wilt appeared on the resistant tomato germplasms for up to 14 days after inoculation of R. solanacearum. Microscopy of resistant tomato stems infected with R. solanacearum revealed limited bacterial spread with thickening of pit membrane and gum production. Therefore, these four resistant tomato germplasms could be used in tomato breeding program against bacterial wilt.
authors.affiliation: National Agrobiodiversity Center, National Academy of Agricultural Science, Rural Development Administration, Jeonju 54874, Korea.
authors.forename: Sang Gyu
authors.initials: SG
authors.lastname: Kim
authors.affiliation: National Agrobiodiversity Center, National Academy of Agricultural Science, Rural Development Administration, Jeonju 54874, Korea.
authors.forename: On-Sook
authors.initials: OS
authors.lastname: Hur
authors.affiliation: National Agrobiodiversity Center, National Academy of Agricultural Science, Rural Development Administration, Jeonju 54874, Korea.
authors.forename: Na-Young
authors.initials: NY
authors.lastname: Ro
authors.affiliation: National Agrobiodiversity Center, National Academy of Agricultural Science, Rural Development Administration, Jeonju 54874, Korea.
authors.forename: Ho-Cheol
authors.initials: HC
authors.lastname: Ko
authors.affiliation: National Agrobiodiversity Center, National Academy of Agricultural Science, Rural Development Administration, Jeonju 54874, Korea.
authors.forename: Ju-Hee
authors.initials: JH
authors.lastname: Rhee
authors.affiliation: National Agrobiodiversity Center, National Academy of Agricultural Science, Rural Development Administration, Jeonju 54874, Korea.
authors.forename: Jung Sook
authors.initials: JS
authors.lastname: Sung
authors.affiliation: National Agrobiodiversity Center, National Academy of Agricultural Science, Rural Development Administration, Jeonju 54874, Korea.
authors.forename: Kyoung-Yul
authors.initials: KY
authors.lastname: Ryu
authors.affiliation: National Agrobiodiversity Center, National Academy of Agricultural Science, Rural Development Administration, Jeonju 54874, Korea.
authors.forename: Sok-Young
authors.initials: SY
authors.lastname: Lee
authors.affiliation: National Agrobiodiversity Center, National Academy of Agricultural Science, Rural Development Administration, Jeonju 54874, Korea.
authors.forename: Hyung Jin
authors.initials: HJ
authors.lastname: Baek
keywords: Ralstonia solanacearum; bacterial wilt; genetic resource; resistance; tomato