국내 배추 뿌리혹병균, Plasmodiophora brassicae의 race와 그 우점 양상

다국어 초록 (Multilingual Abstract)

Single spores were isolated from infected roots of Chinese cabbage with a typical clubroot symptom, collected
from different Chinese cabbage cultivation areas in Korea. When the single spore isolates were inoculated on
Chinese cabbage, radish, turnip, kale, leaf mustard and Williams' differential varieties, among 321 roots harvested
two weeks after inoculation, a visual symptom was observed on only one root and light/uncommon
symptoms were done on 70 roots. These 71 individuals were homogenized and used as inocula. These inocula
caused generally higher pathogenicity than that of single spore. Finally 15 isolates, with enough growth for
conducting further experiment, were selected. These 15 individuals were grouped four, seven, two and two
into race 1, race 4, race 9 and race 11, respectively, using Williams' differential set. It was confirmed that race
4 were dominantly present in Korea. These 15 had been obtained from roots of Chinese cabbages, radishes
and turnips inoculated with single resting spores and had shown pathogenicity to Laurentian and Wilhelmsburger
belong to Rutabaga in Williams' differential variety set. Therefore, we assume that such characteristic
pathotypes including race 4, especially, of P. brassicae showing strong pathogenicity to Chinese cabbage, radish
and turnip may be dominant in Korea.

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