Screening of Resistance Cultivar to Clubroot Caused by Plasmodiophora brassicae for Organic Cultivation of Chinese Cabbage

Research in Plant Disease 2012;18(2):123-128.
Published online June 30, 2012.

Min-Jeong Kim, Chang-Ki Shim*, Yong-Ki Kim, Sung-Jun Hong, Jong-Ho Park, Eun-Jung Han, Min-Ho Lee and Hyeong-Jin Jee

Organic Agriculture Division, National Academy of Agricultural Science, Suwon 441-707, Korea

Received: April 26, 2012 Revised: May 18, 2012 Accepted: May 23, 2012

Abstract

We investigated the resistance of 50 commercial Chinese cabbage cultivars against clubroot disease caused by Plasmodiophora brassicae in the three difference fields, Suwon, Hwacheon, and Pyeongchang. Wilting symptom on Chinese cabbage was first observed at 15 days after transplanting in Pyeongchang and Hwacheon, while disease symptoms appeared later in Suwon after the rainy season. Among 50 cultivars, eight cultivars, SC26, SC29, SC30, SC31, SC34, SC46, SC47 and SC50 showed highly susceptible symptoms like wilting and heavy root galls in all three fields. Meanwhile, seven cultivars such as SC05, SC06, SC07, SC09, SC11, SC17, and SC36 showed moderate resistance with delayed wilting and few root galls. Only two cultivars, Chuwol (CB22) and Gohyangssam (CB23) were highly resistant to clubroot disease until the harvest season in all of the three fields. These two commercial cultivars may be considered as candidate cultivars for cultivation of organic Chinese cabbage in Suwon, Hwacheon, and Pyeongchang.

Key Words: Bioassay, Brassica campestris ssp. pekinenesis, Plasmodiophora brassicae