title: Occurrence of Clubroot on Pak-Choi Caused by Plasmodiophora brassicae.
abstract: Clubroot symptoms occurred severely on roots of Pak-Choi (Brassica campestris ssp. chinensis) grown in greenhouses in Gwangju city, Gyeonggi province, Korea in September, 2008. The incidence of the disease symptoms reached as high as 90% in three greenhouses investigated. The root galls collected from the greenhouses were sectioned using a scalpel and observed by light microscope. Many resting spores were found in the cells of the root gall tissues. Suspension of resting spores was prepared from the root galls and inoculated to roots of healthy Pak-Choi plants. Each of five resting spore suspensions caused clubroot symptoms on the roots, which were similar to those observed during the greenhouse survey. Resting spores of the pathogen were observed in the cells of the affected roots. The clubroot pathogen was identified as Plasmodiophora brassicae based on its morphological and pathological characteristics. This is the first report that Plasmodiophora brassicae causes clubroot of Pak-Choi.
authors: Agricultural Microbiology Division, National Academy of Agricultural Science, Rural Development Administration, Suwon 441-707, Korea.
authors: Wan Gyu
authors: WG
authors: Kim
authors: Mi Hwa
authors: MH
authors: Moon
authors: Jin Hee
authors: JH
authors: Kim
authors: Hyo Won
authors: HW
authors: Choi
authors: Sung Kee
authors: SK
authors: Hong
keywords: Brassica campestris ssp. chinensis; Clubroot; Pak-Choi; Pathogenicity; Plasmodiophora brassicae
references: Plant Dis. 1998 Jan;82(1):129
references: 30857059