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8. Investigating Occurrence of Duplicate Updates in BGP Announcements

Author

Park, Jong Han, Jen, Dan, Lad, Mohit, Amante, Shane, McPherson, Danny, Zhang, Lixia, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Krishnamurthy, Arvind, editor, and Plattner, Bernhard, editor

Published
2010
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39. Occurrence of Cercospora Leaf Spot Caused by Cercosporacf. flagellarison Melon in Korea

Author

Park, Mi-Jeong, Back, Chang-Gi, and Park, Jong-Han

Abstract

AbstractIn 2016, a cercosporoid fungus was found from leaf spot symptoms on melon in Korea. The fungus isolated from the plant was identified based on morphological characteristics and sequence analyses of five genes (ITS rDNA, translation elongation factor 1-α, actin, calmodulin, and histone H3). The fungal isolate was found to be pathogenic to melon. The results confirm that the fungus associated with leaf spot on melon was Cercosporacf. flagellaris. This is the first report of Cercosporacf. flagellariscausing Cercospora leaf spot on melon in Korea.

Published
2020
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40. Colletotrichum cymbidiicolaCausing Anthracnose on CymbidiumOrchids in Korea

Author

Park, Mi-Jeong, Back, Chang-Gi, and Park, Jong-Han

Abstract

AbstractA Colletotrichumspecies was isolated from leaves of Cymbidiumexhibiting symptoms of anthracnose. In this study, the isolates obtained were identified based on recent taxonomic approaches for the genus Colletotrichum. The identity of the causal pathogen was confirmed using morphological data and phylogenetic analysis of combined multi-gene dataset (internal transcribed spacer, glyceraldehyde 3-phosphate dehydrogenase, chitin synthase-1, actin, histone3, beta-tubulin, and calmodulin). Pathogenicity testing revealed that the isolates were pathogenic to Cymbidium. Based on these results, the fungal pathogen occurring on Cymbidiumorchids was identified as Colletotrichum cymbidiicola,which is a newly recorded species in Korea.

Published
2020
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41. Plant Diseases Occurring on Rose Stem

Author

Han Kyung-Sook, Park Jong-Han, Lee Jung-Sup, and Seo Sang-Tae

Subjects
Canker, fungi, food and beverages, Plant Science, Cut flowers, Biology, biology.organism_classification, Hydroponics, medicine.disease, Biochemistry, Horticulture, Colletotrichum gloeosporioides, Botany, Root rot, medicine, Blight, Pythium, Agronomy and Crop Science, Molecular Biology, Biotechnology, Botrytis cinerea
Abstract

The rose is one of the most important commercial cut flowers in the world. Recently stem blight symptoms have often found in hydroponics and soil cultured roses. These symptoms are appeared by four diseases; gray mold caused by Botrytis cinerea, common canker by Coniothyrium fuckelii, anthracnose by Colletotrichum gloeosporioides, and Pythium root rot by Pythium sp. Each symptom and its causal pathogen is described.

Published
2006
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42. Effect of Temperature on Pathogen Growth and Damage Analysis of Leaf Spot Disease on Grapevine Caused by Paeudocercospora vitis in Korea

Author

Jang Han-Ik, Park Jong-Han, Kim Heung-Tae, Lee Jung-Sup, Seo Sang-Tae, and Han KyeongSuk

Subjects
In vitro test, biology, Damage analysis, Plant Science, Fungus, biology.organism_classification, Biochemistry, Pseudocercospora vitis, Horticulture, Germination, Leaf spot, Agronomy and Crop Science, Molecular Biology, Pathogen, Biotechnology
Abstract

This study was carried out to know damages of the grapevine trees by the disease to the leaf spot from 2000 to 2003. The isolates collected from different varieties and locations were identified as Pseudocercospora vitis (.) Speg. based on the morphological and cultural characteristics. According to the in vitro test, the range of temperatures for the mycerial growth and the conidical germination of the fungus were from and optimum temperature was . There were remarkably different features between a low infection trees group and high infection trees group in terms of number of leaves per fruit branch, length and diameter of internode and leaf area.

Published
2006
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43. Induction of Disease Resistance by Acibenzolar-S-methyl, the Plant Activator against Gray Mold (Botrytis cinerea) in Tomato Seedlings

Author

Lee Jung-Sup, Kang Nam-Jun, Han Kyoung-Suk, Jang Han-Ik, Seo Sang-Tae, and Park Jong-Han

Subjects
chemistry.chemical_classification, biology, fungi, food and beverages, Plant Science, Oxidative phosphorylation, respiratory system, Plant disease resistance, musculoskeletal system, biology.organism_classification, Biochemistry, respiratory tract diseases, chemistry.chemical_compound, Horticulture, Enzyme, chemistry, biology.protein, Acibenzolar-S-methyl, Agronomy and Crop Science, Molecular Biology, Pathogen, Mycelium, Biotechnology, Peroxidase, Botrytis cinerea
Abstract

The plant defence activator, Acibenzolar-S-methyl [benzo (1,2,3) thiadiazole-7-carbothioic acid-S-methyl ester, ASM] was assayed on tomato seedlings for its ability to induce resistance against Botrytis cinerea, the causal agent of gray mold in tomato. Pre-treatment of plants with ASM reduced the severity of the disease as well as the growth of the mycelium in plants. In ASM treated plants, reduction in disease severity (up to 55%) was correlated with suppression of mycelia growth (up to 46.5%) during the time course of infection. In plants treated with ASM, activities of peroxidase were determined as markers of resistance. Applications of ASM induced Progressive and significant increase of the enzyme in locally treated tissues. Such responses were expressed earlier and with a much higher magnitude when ASM-treated seedlings were challenged with the pathogen, thus providing support to the concept that a signal produced by the pathogen is essential for triggering enhanced synthesis and accumulation of the enzymes. No such activities were observed in water-treated control plants. Therefore, the slower symptom development and reduction in mycelium growth in ASM treated plants might be due to the increase in activity of oxidative and antioxidative protection systems in plants.

Published
2006
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44. Control of Tomato Wilt Disease by Amending pH of Nutrient Solution in Hydroponic System

Author

Park Jong-Han, Choi Ji-Ho, Han Kyoung-Suk, Lee Jung-Sup, Seo Sang-Tae, and Jang Han-Ik

Subjects
Ralstonia solanacearum, education.field_of_study, biology, Inoculation, fungi, Population, food and beverages, Greenhouse, Plant Science, biology.organism_classification, Hydroponics, Biochemistry, Horticulture, Agronomy, Transplanting, education, Agronomy and Crop Science, Molecular Biology, Bacteria, Biotechnology, Wilt disease
Abstract

The effect of pH on the survival of R. solanacearum and its transmission via roots of tomato in hydroponic culture were studied in laboratory and greenhouse. In laboratory experiment, R. solanacearum could not survive for 24h in nutrient solution with pH of , while 1, 14, 51 and of inoculum survived at pH , respectively. When tomato plants were inoculated with R. solanacearum through wounds on the stems, the bacteria moved downward from the inoculation site to the roots and infectious bacteria were released from the roots into the nutrient solution. Of two pH regimes tested in greenhouse nutrient-film technique(NFT) culture, the R. solanacearum population was significantly lower in pH 5.0 than in pH 6.5 in most sampling data. In treatments in which R. solanacearum was introduced by transplanting two root-inoculated plants, significantly move plants developed wilt at pH (34 out of 48 plants) than at pH 5.0(11 out of 48 plants). In addition, when the bacterium was introduced by transplanting two stem-inoculated plants at pH , seven out of 24 plants developed wilt.

Published
2005
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