Jung-Wook Yang
Rural Development Administration
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Featured researches published by Jung-Wook Yang.
Korean Journal of Food Science and Technology | 2013
Seon-Kyeong Han; Yeon-Sang Song; Hyeong-Un Lee; Seung-Hyun Ahn; Jung-Wook Yang; Joon-Seol Lee; Mi-Nam Chung; Sae-Jung Suh; Keun-Hyung Park
We investigated out the effect of cultivation region on the physicochemical characteristics of starch in six sweetpotato cultivars. The following sweetpotato cultivars were analyzed: Daeyumi, Shingeonmi, Jinhongmi, Shinyulmi, Yulmi, and Yeonhwangmi. Samples were cultivated in Muan, Iksan, Nonsan, Boryeong and Hamyang. The soil texture was found to be sandy loam in Muan, Iksan, and Boryeong, sandy clay loam in Nonsan, and loam in Hamyang. The starch content of the sweetpotato was higher in Muan than in Hamyang. The amylose content was 22.3-30.9%, and the highest amylose content was found in samples from Iksan. Rapid viscosity analysis showed that the samples from Hamyang had the lowest values of pasting temperature, while samples of the Daeyumi cultivar had the highest values. Thermal analysis with a differential scanning calorimeter showed that the Muan samples had the highest values of onset temperature, maximum peak temperature, and completion temperature, and the samples from Hamyang had the lowest values. There was no difference between the cultivation regions or the cultivar in the X-ray pattern of the starch or its appearance in scanning electron micrographs. Therefore, the results of this study confirm that cultivation region and cultivar play an important role in determining the quality of sweetpotato and the physicochemical characteristics of sweetpotato starch.
Acta Physiologiae Plantarum | 2017
Joon Ha; Jong Chan Won; Yong Hak Jung; Jung-Wook Yang; Hyeong-Un Lee; Ki Jung Nam; Sung-Chul Park; Jae Cheol Jeong; Shin-Woo Lee; Dong Woon Lee; Jung-Sung Chung; Jeung Joo Lee; Yun-Hee Kim
As a major root-knot nematode (RKN), Meloidogyne incognita causes serious losses in the yield of sweet potato (Ipomoea batatas L.). To successfully colonize the host plant, RKNs elicit changes of dramatic physiological and morphological features in the plants. The expression of several genes is regulated as the nematode establishes its feeding site. Therefore, in this study, we analyzed the proteomes in the fibrous roots of sweet potato plants by an infection of RKN to understand the effect of the infection on the plant root regions. This study revealed differences in proteomes of the RKN-resistant sweet potato cultivar Juhwangmi and RKN-sensitive cultivar Yulmi. During plant growth, Juhwangmi plants were shown to be more resistant to M. incognita than Yulmi plants. No M. incognita egg formation was observed in Juhwangmi plants, whereas 587 egg masses were formed in Yulmi plants. Differentially expressed 64 spots were confirmed by proteomic analysis using 2-D gel electrophoresis with three spots up-regulated in the two cultivars during RKN infection. Of these 64 protein spots, 20 were identified as belonging to such different functional categories as the defense response, cell structure, and energy metabolism. This study provides insight into the molecular and biochemical mechanics of the defense response and metabolism of sweet potato plant during nematode invasion. We anticipate that this study will also provide a molecular basis for useful crop breeding and the development of nematode-tolerant plants.
Korean Journal of Food Science and Technology | 2014
Seon-Kyeong Han; Yeon-Sang Song; Seung-Hyun Ahn; Jung-Wook Yang; Hyeong-Un Lee; Joon-Seol Lee; Mi-Nam Chung; Sang-Sik Nam; In-Hoo Choi; Keun-Hyung Park
This study was performed to understand the effect of cultivation periods on the physicochemical characteristics of the starch of five sweetpotato cultivars, cultivated in Muan, Korea. Starch, protein, and ash contents increased with increased cultivation period, whereas amylose content decreased. Rapid viscosity analysis showed that the pasting temperature, peak viscosity, breakdown, setback and final viscosity increased with increased cultivation period. However, trough and final viscosity decreased. Although the onset temperature and peak temperature values increased, the conclusion temperature did not show any consistent patterns by differential scanning calorimetry. X-ray diffraction showed that the starch samples had C-type crystallinity irrespective of the cultivation period and cultivar. The starch granules were dominantly round and oval, or polygonal irrespective the cultivation period. The bigger the particle size was, the longer the cultivation period was.
Planta | 2018
Il Hwan Lee; Donghwan Shim; Jea Cheol Jeong; Yeon Woo Sung; Ki Jung Nam; Jung-Wook Yang; Joon Ha; Jeung Joo Lee; Yun-Hee Kim
Main conclusionTranscriptome analysis was performed on the roots of susceptible and resistant sweetpotato cultivars infected with the major root-knot nematode species Meloidogyne incognita. In addition, we identified a transcription factor-mediated defense signaling pathway that might function in sweetpotato–nematode interactions.Root-knot nematodes (RKNs, Meloidogyne spp.) are important sedentary endoparasites of many agricultural crop plants that significantly reduce production in field-grown sweetpotato. To date, no studies involving gene expression profiling in sweetpotato during RKN infection have been reported. Therefore, in the present study, transcriptome analysis was performed on the roots of susceptible (cv. Yulmi) and resistant (cv. Juhwangmi) sweetpotato cultivars infected with the widespread, major RKN species Meloidogyne incognita. Using the Illumina HiSeq 2000 platform, we generated 455,295,628 pair-end reads from the fibrous roots of both cultivars, which were assembled into 74,733 transcripts. A number of common and unique genes were differentially expressed in susceptible vs. resistant cultivars as a result of RKN infection. We assigned the differentially expressed genes into gene ontology categories and used MapMan annotation to predict their functional roles and associated biological processes. The candidate genes including hormonal signaling-related transcription factors and pathogenesis-related genes that could contribute to protection against RKN infection in sweetpotato roots were identified and sweetpotato–nematode interactions involved in resistance are discussed.
Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie | 2018
Jung-Wook Yang; Sang-Sik Nam; Hyeong-Un Lee; Kyu-Hwan Choi; Se-Gu Hwang; Narayan Chandra Paul
Abstract Fusarium species are important post-harvest pathogens of sweet potato worldwide. A root rot disease was observed on sweet potato (Ipomoea batatas) at storage houses in different locations in South Korea during 2016–2017. The disease was characterized by circular lesions with dark and light brown concentric rings along with cavities in the inner part of the root. Seven isolates were recovered from diseased samples. Two representative isolates were cultured on potato dextrose agar and the morphology was studied. Macroconidia were cylindrical and slightly curved with blunt and rounded apical cells. The size of the macroconidia was 28.3 (15.0–44.3) × 5.8 (4.2–8.3) μm. The microconidia were fusiform to ovoid, variable in size and aseptate or rarely with single septa. Microconidial size varied from 9.2 (5.2–16.1) × 3.6 (2.6–4.5) μm. The fungal isolates were identified as Fusarium solani (Martius) Appel & Wollenweber emend. Snyder & Hansen on the basis of the morphological and cultural characteristics. The isolates were confirmed as F. solani on the basis of molecular identification by rDNA–ITS and translation elongation factor (EF 1-α) gene sequence analysis. The pathogenicity of the organism was confirmed by fulfilling Koch’s postulates. To our knowledge, this is the first report of F. solani root rot of sweet potato in South Korea.
Mycobiology | 2017
Narayan Chandra Paul; Eom-Ji Hwang; Sang-Sik Nam; Hyeong-Un Lee; Joon-Seol Lee; Gyeong-Dan Yu; Yong-Gu Kang; Kyeong-Bo Lee; San Go; Jung-Wook Yang
Abstract 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.
The Korean Journal of Crop Science | 2015
Hyeong-Un Lee; Mi-Nam Chung; Seon-Kyeong Han; Seung-Hyun Ahn; Joon-Seol Lee; Jung-Wook Yang; Yeon-Sang Song; Jae-Myung Kim; Sang-Sik Nam; In-Hu Choi
The Korean Journal of Crop Science | 2015
Jung-Wook Yang; Jea-Myung Kim; Hyeong-Un Lee; Seon-Kyeong Han; Joon-Seol Lee; Sang-Sik Nam; Mi-Nam Chung; Yeon Sang Song; Seung-Hyun Ahn; In-Hu Choi
Journal of Plant Biotechnology | 2015
Ung-Han Yoon; Jae Cheol Jeong; Sang-Soo Kwak; Jung-Wook Yang; Tae-Ho Kim; Hyeong-Un Lee; Sang-Sik Nam; Jang-Ho Hahn
Korean Journal of Breeding | 2018
Hyeong-Un Lee; Mi-Nam Chung; Joon-Seol Lee; Seung-Hyun Ahn; Jae-Myung Kim; Seon-Kyeong Han; Jung-Wook Yang; Yeon-Sang Song; Hyun-Man Shin; Jin-Young Moon; Kyu-Hwan Choi; Sang-Hyun Lim; and In-Hu Choi