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Ocurrence of Clubroot Caused by Plasmodiophora brassicae on Kohlrabi in Korea
Res. Plant Dis. 2019;25:33-37
Published online March 31, 2019
© 2019 The Korean Society of Plant Pathology.

MinA Song1, InYoung Choi2* , JeongHeub Song1, KuiJae Lee3, HyeonDong Shin4, and Victor Galea5

1Eco-friendly Agricultural Research Department, Jeju-do Agricultural Research and Extension Services, Jeju 63556, Korea, 2Agricultural Environment Division, Jeollabuk-do Agricultural Research and Extension Services, Iksan 54591, Korea, 3Division of Biotechnology, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan 54596, Korea, 4Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Korea, 5School of Agriculture and Food Sciences, The University of Queensland, QLD 4343, Australia
Tel: +82-63-290-6182, Fax: +82-63-290-6198, E-mail:choiiy21@korea.kr, ORCID http://orcid.org/0000-0003-1804-6747
Received January 10, 2019; Revised February 7, 2019; Accepted February 8, 2019.
cc This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
From 2016 to 2018, approximately 15% of kohlrabi were observed displaying significant clubroot symptoms in farmer’s fields in Jeju, Korea. The initial infection appeared as hypertrophy of root hairs, and as the disease progressed, galls formation occurred on the main roots, finally disease progress resulted in yellowing and wilting of leaves. Pathogenicity was proven by artificial inoculation of plants with resting spore suspension, fulfilling Koch’s postulates. The resting spore is one-celled, spherical and subspherical, colorless, and 3-5 µm in diameter. On the basis of the morphological characteristics and phylogenetic analyses of internal transcribed spacer rDNA, the causal agent was identified as Plasmodiophora brassicae. To our knowledge, this is the first report on the occurrence of P. brassicae on kohlrabi in Korea.
Keywords : Clubroot, Kohlrabi, Plasmodiophora brassicae, Resting spore


March 2019, 25 (1)