Res. Plant Dis > Volume 25(3); 2019 > Article
Research in Plant Disease 2019;25(3):143-148.
DOI:    Published online September 30, 2019.
Didymella sp.에 의한 고사리 신규 마름병 발생 보고
이정은1 · 김기범2 · 박주은2 · 김다운2 · 신유경2 · 윤성환2* · 정영륜1*
2순천향대학교 의료생명공학과
First Report of a Bracken Blight Disease Caused by Didymella sp.
Jung Eun Lee1, Ki Beom Kim2, Ju Eun Park2, Da-Woon Kim2, Yoo-Kyoung Shin2, Sung-Hwan Yun2, Young-Ryun Chung1
1Research and Technology Development Institute, JGreen Inc., Jinju 52840, Korea
2Department of Medical Biotechnology, Soonchunhyang University, Asan 31538, Korea
Correspondence:  Young-Ryun Chung, Sung-Hwan Yun,*Y.-R. Chung
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*S.-H. Yun
Tel: +82-41-530-1288
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Sung-Hwan Yun
Received: August 16, 2019   Revised: September 11, 2019   Accepted: September 11, 2019
An outbreak of new disease with leaf and stem blight symptom occurred at bracken-growing fields in Namhae-gun, Gyeongsangnam-do, Korea during the last 4 years. This new disease caused significant yield losses on bracken production in this area. We have collected diseased leaves and stems showing the blight symptom in May, July, and October 2018 to investigate causal pathogens. A total of 92 fungal isolates were obtained from the diseased samples and their pathogenicity was tested on healthy bracken leaves. From the total isolates, 22 isolates were able to produce the leaf blight symptom similar to the original one found in the fields. To identify two fungal pathogens which showed higher virulence levels compared to other pathogenic isolates, we constructed phylogenetic trees using the nucleotide sequences of genes for ribosomal RNA, RNA polymerase beta subunit, beta tubulin, and internal transcribed region. Most phylogenetic trees constructed indicate that both isolates, which are identical to each other, reside in a clade of the genus Didymella and possibly similar to D. rumicicola or D. acetosellae. Nevertheless, the exact identification of these pathogens at the species level needs further investigations. This is the first report of a blight disease on bracken by Didymella sp.
Key Words: Bracken, Bracken blight disease, Didymella sp.

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