Young Jin Koh

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A bacterial pathogen, Pseudomonas syringae pv. actinidiae (Psa), is a causal agent of kiwifruit bacterial canker worldwide. Psa biovar 3 (Psa3) was first detected in 2011 at an orchard in Dodeok-myeon, Goheunggun, Jeonnam Province in Korea. In this study, we present the results of an epidemiological study regarding Psa3 occurrence on kiwifruit orchards in(More)
Usnea longissima has long been used as a traditional medicine in China, India, Turkey, Canada and Europe. This lichen can produce several bioactive compounds that primarily belong to the polyketide family. The enzymes responsible for the production of these compounds are the polyketide synthases, but the biosynthetic processes in lichens are still unclear.(More)
The molecular features of Pseudomonas syringae pv. actinidiae strains isolated in Korea were compared with strains isolated in Japan and Italy. Sequencing of eight P. syringae pv. actinidiae and three P. syringae pv. theae strains revealed a total of 44 single nucleotide polymorphisms across 4,818 bp of the concatenated alignment of nine genes. A multiplex(More)
Based on a literature survey and assessment of the important features of lichen genus Buellia (spore shape and size, anatomy of the exciple as well as analysis of the lichen substances), the present paper describes four new records of B. maritima, B. polyspora, B. spuria and B. stellulata from South Korea. Among them, B. maritima and B. polyspora are(More)
The paper describes nine new records of macro- and micro-lichens from Korea. A brief taxonomic description and comments are presented for all the studied taxa (Catapyrenium squamellum, Chrysothrix candelaris, Endocarpon pallidulum, Endocarpon petrolepideum, Lecanora oreinoides, Leprocaulon albicans, Parmotrema saccatilobum, Verrucaria glaucina and Xanthoria(More)
This study was aimed at evaluating the antioxidant activities of methanol extract of Thamnolia vermicularis. The antioxidant activity, reducing power, superoxide anion radical scavenging and free radical scavenging activities were studied. The antioxidant activity of the extract correlated with its concentration (0.2~2 mg/ml) in the reaction mixtures(More)
Bryophytes comprise one of the richest microfungal microhabitats in the Antarctic environment. The maritime Antarctic is very vulnerable to rapid environmental change caused by global warming. The aim of this study was to investigate the importance of bryophytes as a microhabitat for fungal species in the maritime Antarctic by surveying endophytic fungal(More)
The effect of plant hormones on the growth of lichen-forming fungi (LFF) was evaluated. The use of 2,3,5-triiodobenzoic acid and indole-3-butyric acid resulted in a 99% and 57% increase in dry weight of the lichen-forming fungus Nephromopsis ornata. The results suggest that some plant hormones can be used as inducers or stimulators of LFF growth for(More)
A taxonomic study of Peltigera in South Korea was performed. The phylogenetic analysis based on nr DNA internal transcribed spacer sequences suggests that Peltigera is a well-supported monophyletic group. Important characteristics are the phycobiont type of thallus and the vein type at the lower cortex (wide and flat, or narrow and ridged). The vertical or(More)
— A study on taxonomy and phylogeny of Heterodermia in South Korea is presented for the first time. Phenotypic analysis was based on morphological, anatomical, and chemical characters, and phylogenetic analysis was based on nrDNA ITS sequences. The results suggest that the genus Heterodermia is monophyletic. Some characters (e.g. corticate vs. ecorticate(More)