• Title/Summary/Keyword: bioenergy crop

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Screening of Selected Korean Sweetpotato (Ipomoea batatas) Varieties for Fusarium Storage Root Rot (Fusarium solani) Resistance

  • Lee, Seung-yong;Paul, Narayan Chandra;Park, Won;Yu, Gyeong-Dan;Park, Jin-Cheon;Chung, Mi-Nam;Nam, Sang-Sik;Han, Seon-Kyeong;Lee, Hyeong-Un;Goh, San;Lee, Im Been;Yang, Jung-Wook
    • The Korean Journal of Mycology
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    • v.47 no.4
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    • pp.407-416
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    • 2019

  • A common post-harvest disease of sweetpotato tuber is root rot caused by Fusarium solani in Korea as well as the other countries. Storage root rot disease was monitored earlier on sweetpotato (Ipomoea batatas) in storehouses of different locations in Korea. In the present study, an isolate SPL16124 was choosen and collected from Sweetpotato Research Lab., Bioenergy Crop Research Institute, NICS, Muan, Korea, and confirmed the identification as Fusarium solani by conidial and molecular phylogenetic analysis (internal transcribed spacer ITS and translation elongation factor EF 1-α gene sequences). The isolate was cultured on potato dextrose agar, and conidiation was induced. The fungus was screened for Fusarium root rot on tuber of 14 different varieties. Among the tested variety, Yenjami, Singeonmi, Daeyumi, and Sinjami showed resistant to root rot disease. Additionally, the pathogen was tested for pathogenicity on stalks of these varieties. No symptom was observed on the stalk, and it was confirmed that the disease is tissue specific.

  • https://doi.org/10.4489/KJM.20190045 인용 PDF KSCI

Phylogenetic Placement and Morphological Characterization of Sclerotium rolfsii (Teleomorph: Athelia rolfsii) Associated with Blight Disease of Ipomoea batatas in Korea

  • Paul, Narayan Chandra;Hwang, Eom-Ji;Nam, Sang-Sik;Lee, Hyeong-Un;Lee, Joon-Seol;Yu, Gyeong-Dan;Kang, Yong-Gu;Lee, Kyeong-Bo;Go, San;Yang, Jung-Wook
    • Mycobiology
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    • v.45 no.3
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    • pp.129-138
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    • 2017

  • In this study, we aimed to characterize fungal samples from necrotic lesions on collar regions observed in different sweetpotato growing regions during 2015 and 2016 in Korea. Sclerotia appeared on the root zone soil surface, and white dense mycelia were observed. At the later stages of infection, mother roots quickly rotted, and large areas of the plants were destroyed. The disease occurrence was monitored at 45 and 84 farms, and 11.8% and 6.8% of the land areas were found to be infected in 2015 and 2016, respectively. Fungi were isolated from disease samples, and 36 strains were preserved. Based on the cultural and morphological characteristics of colonies, the isolates resembled the reference strain of Sclerotium rolfsii. Representative strains were identified as S. rolfsii (teleomorph: Athelia rolfsii) based on phylogenetic analysis of the internal transcribed spacer and large subunit genes along with morphological observations. To test the pathogenicity, sweetpotato storage roots were inoculated with different S. rolfsii strains. 'Yulmi' variety displayed the highest disease incidence, whereas 'Pungwonmi' resulted in the least. These findings suggested that morphological characteristics and molecular phylogenetic analysis were useful for identification of S. rolfsii.

  • https://doi.org/10.5941/MYCO.2017.45.3.129 인용 PDF KSCI