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First Report of Bacterial Root Rot Caused by Serratia plymuthica on Panax ginseng
Res. Plant Dis. 2018;24:332-338
Published online December 31, 2018
© 2018 The Korean Society of Plant Pathology.

Won Kwon Jung1, Young Soo Kim2, Jin Kook Choi1, Seung-Han Kim1, Myeong-Hwan Jang1, Tae Lyong Kwon1, and Yongho Jeon2*

1Punggi Ginseng Research Institute, Gyeongsangbuk-do Agricultural Reseach & Extension Services, Yeongju 36052, Korea
2Department of Plant Medicals, Andong National University, Andong 36729, Korea
*Tel: +82-54-820-5507 Fax: +82-54-820-6320 E-mail: yongbac@andong.ac.kr
Received October 9, 2018; Revised November 5, 2018; Accepted November 10, 2018.
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
In August of 2011, a wilting disease of ginseng was observed at Bongwha, Gyeongbuk province, Korea. Affected plants initially show withering symptoms on leaves of ginseng. As the disease progresses, withering leaves spread downward, eventually encompassing the whole plant. Leaves lose vigor but remain pale green. Symptoms of roots were brown, and soft rots characterized by moist and watery decay of the whole ginseng root, which initiated as small brown, water-soaked lesions of hairy roots and enlarged to the entire roots. The causal organism isolated from the infected roots was identified as Serratia plymuthica based on its physiological and biochemical characteristics, by cellular fatty acid composition (GC-FAME), the utilization of carbon sources (BioLog System), and 16S rRNA sequence of the isolated bacterium were 99% homologous to those of Serratia plymuthica strains. Artificial inoculation of the bacterium produced the same brown or soft rot symptoms on the ginseng roots, from which the same bacterium was isolated. This is the first report of bacterial root rot caused by the Serratia plymuthica in ginseng in Korea. Serratia plymuthica has been used as antagonistic microorganism for biological control on several crop plants. But it was proved pathogen of ginseng at humid condition in this study.
Keywords : Bacterial root rot disease, Biolog system, ginseng, Panax ginseng, Serratia plymuthica


December 2018, 24 (4)