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http://dx.doi.org/10.5423/RPD.2010.16.3.279

Convenient Screening Method of Chinese Cabbage for Resistance to Plasmodiophora brassicae Using Soil-Drenching Inoculation  

Jo, Su-Jung (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology)
Jang, Kyoung-Soo (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology)
Choi, Yong-Ho (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology)
Kim, Jin-Cheol (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology)
Choi, Gyung-Ja (Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology)
Publication Information
Research in Plant Disease / v.16, no.3, 2010 , pp. 279-284 More about this Journal
Abstract
Clubroot caused by Plasmodiophora brassicae is a widespread disease that causes serious problems in many brassica growing areas. To establish more simple and reliable clubroot screening method of Chinese cabbage to P. brassicae using soil-drenching inoculation, the development of clubroot on Chinese cabbage according to several conditions such as soil type, inoculum concentration of P. brassicae GN-1 (race 9), plant growth stage and incubation period was studied. In a commercial horticulture nursery media soil (CNS), disease severity of the seedling according to inoculum concentration increased in a dose-dependent manner, but did not in mixture of CNS and upland soil (1:1, v/v). To facilitate and acquire precise result of resistance screening of Chinese cabbage to clubroot, 10-day-old seedlings should be inoculated by drenching the spore suspension of P. brassicae to give inoculum density of $4.0{\times}10^8$ spores/pot. To develop the disease, the inoculated seedlings were incubated in a growth chamber at $20^{\circ}C$ for 3 days, and then cultivated in a greenhouse ($25{\pm}5^{\circ}C$) for five weeks. Under the optimum conditions, 25 clubroot-resistant (CR) and 3 clubroot-susceptible (CS) cultivars were tested for resistance to P. brassicae. All CR cultivars showed very clear resistance response, on the other hand all CS cultivars severly infected with the pathogen. The results suggest that this method is efficient screening method of Chinese cabbage for resistance to clubroot disease.
Keywords
Breeding; Clubroot; Crucifer crops; Cultivar; Resistant;
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Times Cited By KSCI : 6  (Citation Analysis)
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