• Animal cells and systems
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• v.8 no.4
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• pp.289-294
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• 2004

Bupleurum latissimum is a narrowly endemic and endangered plant, restricted to only two small populations on steep cliffs of a small island, Ulleung Island, in Korea. The genetic diversity and population differentiation in the two remnant populations of the species were investigated using RAPD (random amplified polymorphic DNA) analysis. The Neis gene diversities were 0.146 in the smaller population of 45 individuals, and 0.151 in the larger population of 61 individuals. The genetic variation was not significantly different between these two populations. Genetic diversity within populations was not low considering the very small size of populations. Analysis of molecular variance (AMOVA) revealed higher variation within populations (65.9%) than genetic differentiation between them (34.1%). B. latissimum revealed higher population differentiation than other outbreeding species. The differentiation of the populations corresponded to low gene flow (Nem = 0.482). The cluster and principal coordination analyses provide strong support for high population differentiation, showing that all individuals of the two populations have built up population-specific clusters. Although gene flow between the two populations of B. latissimum was limited, they have preserved relatively high levels of genetic variation.

• Korean Journal of Plant Resources
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• v.32 no.1
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• pp.86-107
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• 2019

The vascular plants of Island Dolsando, located in Yeosu-si, Jeollanam-do were surveyed 15 times from June 2017 to March 2018. Based on the collected specimens, there were 570 taxa; 113 families, 338 genera, 517 species, 1 subspecies, 49 varieties and 3 formas respectively. 18 taxa of Korean endemic species such as Asarum maculatum Nakai were found. There were total 90 taxa of floristic regional indicator plants specially designated by the Ministry of Environment (Level V to I), 4 taxa of rare plants and 8 taxa of endangered plants including Ligularia taquetii (H. $L{\acute{e}}v.$ & Vaniot) Nakai.

• Journal of the Korean Chemical Society
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• v.67 no.2
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• pp.150-155
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• 2023

Eurya emarginata is an evergreen tree growing in the southern regions of Korea including Jeju Island. In this study, antioxidant and anti-photoaging effects were investigated with the extracts of E. emarginata leaves. As comparative studies with the extract and five solvent fractions, the EtOAc fraction showed the most effective DPPH and ABTS⁺ radical scavenging activities. The EtOAc fraction also inhibited matrix metalloproteinase-1 (MMP-1) production most effectively. Phytochemical study on the EtOAC fraction resulted in the isolation of three compounds; eutigoside C (1), eutigoside B (2) and quercitrin (3). Among the isolates (1-3), quercitrin (3) showed excellent antioxidant activities and inhibitory properties on MMP-1 production. Based on these results, it was suggested that extracts of E. emarginata leaves could be developed as natural anti-photoaging agents in cosmetic formulations.

• Korean Journal of Plant Resources
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• v.25 no.1
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• pp.31-47
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• 2012

Distributional surveys for vascular plants were carried out in Daecheong island, Ongjin-gun, South Korea, from 2008 to 2010. The vascular plants recognized from the island were in tatal 402 taxa that were of 90 families, 269 genus, 350 species, 3 subspecies, 43 varieties, 6 forms. Among the investigated 402 taxa, 2 Korean endemic plants, 8 rare and endangered plants which was designated by Korea Forest Service, 35 specially plants designated by the Ministry of Environment were included. The naturalized plants were identified as 40 taxa and the percentage of naturalized plants index was 9.9%. In addition, an unrecorded species, Thyrocarpus glochidiatus Maxim (Boraginaceae), was recognized from the island.

• Journal of Ecology and Environment
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• v.33 no.2
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• pp.95-103
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• 2010

The archipelago in the southwest sea, Korea, was registered as Shinan Dadohae Biosphere Reserve by United Nations Educational, Scientific and Cultural Organization Man and the Biosphere (UNESCO MAB) on May 26, 2009. This study was conducted to determine a method of reconciling natural and anthropogenic processes and to enable sustainable development in the vicinity of the Shinan Dadohae Biosphere Reserve (SDBR). To accomplish this, the characteristics of SDBR with respect to biodiversity and cultural diversity were evaluated. In addition, a management plan regarding the wise use of the SDBR was developed while focusing on four parts: cultural support to induce motivation for native conservation and development; development and specification of fisheries and cultivation based on local community systems; restructuring of marine food products and resource transporting systems; activation and discovery of indigenous knowledge to enable networking between local residents, academia and the UNESCO-international society.

• Korean Journal of Plant Taxonomy
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• v.51 no.1
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• pp.10-17
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• 2021

Invasive alien species management is pivotal for biodiversity conservation. Commelina caroliniana Walter, from the family Commelinaceae, is an alien plant native to the Himalayas and India, but it has been widely introduced around the world, including in the United States, Brazil, Philippines, and Japan. In Korea, the first population was found growing adjacent to agricultural land and farm roads on Jejudo Island, and field observations confirmed the presence of at least nine populations there. It is similar morphologically to C. diffusa Burm. f. but can be distinguished by involucral bracts that are ciliate at the base, hairs on the peduncle and obsolete upper cincinnus, brown spots on its 4-lobed antherode, and seed surfaces that are smooth to slightly alveolate. It was determined to have an invasiveness low score of 8 according to the Korean 'Invasive Alien Plant Risk Assessment', suggesting that it may spread to natural habitats. Although the current distribution of C. caroliniana is restricted to Jeju-si, it has spread dramatically in many other areas of the world. At present, it has had a limited impact on the local environment, but local and regulatory authorities should pay close attention to this plant and take measures to prevent its expansion in the future.

• Korean Journal of Plant Resources
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• v.30 no.4
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• pp.410-426
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• 2017

To identify the flora of the vascular plants in the Anmyeon Island, field surveys were conducted from June, 2015 to August, 2016. Based on the collected specimens, the vascular plants of the Anmyeon Island were summarized as 717 taxa: 119 families, 400 genera, 632 species, 5 subspecies, 73 varieties and 7 formas. Among the 717 identified taxa, 17 rare plants designated by the Koren Forest Service according to the IUCN valuation species were described: 3 taxa of critically endangered species (CR), 1 taxa of endangered species (EN), 6 taxa of least concerned species (LC), 7 taxa of vulnerable species (VU). 99 taxa of floristic regional indicator plants specially designated by Ministry of Environment also were identified. In addition, 6 Korean endemic species such as Forsythia koreana Nakai and Hemerocallis taeanensis S.S.Kang & M.G.Chung, and 91 naturalized plants such as Rumex acetocella L., Amaranthus lividus L. and Diodia teres Walter etc. were described.

• Journal of Marine Bioscience and Biotechnology
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• v.8 no.1
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• pp.30-38
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• 2016

The objective of this study was to investigate the useful components and potential antioxidant activities of 30 marine algae, collected from Jeju Island in Korea. The contents of bioacitve substance of extracts from marine algae, such total polyphenol and carbohydrate, were determined. The extract of Distromium decumbens had the highest amount of total polyphenol content (21.27%), and that of Gracilaria incurvata Okamura had the highest amount of total carbohydrate content (10.18%). The antioxidant activities of extracts obtained from algae were tested through the evaluation of DPPH radical and hydroxyl radical scavenging activity. The extracts of Distromium decumbens, Sargassum hemiphyllum (Turner) C.Agardh, Sargassum serratifolium (C. Agardh) C. Agardh and Acrosorium yendoi Yamada were found to have more than 80% DPPH radical scavenging activity and that of Dictyota okamurae (Dawson) $H{\ddot{o}}tning$, Schnetter, et Prud'homme van Reine, Myagropsis myagroides (Martens ex Turner) Fensholt, Sargassum serratifolium (C. Agardh) C. Agardh and Cladophora wrightiana Harvey showed more than 50% hydroxyl radical scavenging activity. These results suggest that algae collected from Jeju Island would be good raw materials for antioxidant.

• Korean Journal of Plant Resources
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• v.27 no.5
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• pp.485-500
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• 2014

This study was carried out to inventory the vascular plant flora in Oenarodo Island, Jeollanam-do, South Korea in 2011. The vascular plants collected from the survey sites consisted of 574 taxa in total; 7 forms, 62 varieties, 2 subspecies, 503 species, 342 genera and 117 families. Among them, 8 taxa of Korean rare plants were found distributed in the sites, including Peucedanum hakuunense Nakai, Cymbidium macrorrhizum Lindl. and Bupleurum falcatum L. 6 taxa of Korean endemic plants such as Hepatica insularis Nakai and Carex okamotoi Ohwi were collected. In addition 101 notable taxa designated by the Ministry of Environment were collected as well. 46 taxa of naturalized plants, such as Paspalum distichum var. indutum Shinners and Veronica hederaefolia L. were recognized widely distributed in the sites.

• Korean Journal of Plant Taxonomy
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• v.53 no.1
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• pp.69-77
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• 2023

Leuzea chinensis (S. Moore) Susanna (Asteraceae), a previously unrecorded species in Korea, was found in Yeongdeok-gun, Gyeongsangbuk-do. Symplocos nakaharae (Hayata) Masam. (Symplocaceae), which had been recorded in the literature but whose native habitat was yet to be identified, was found in Geojedo Island, Gyeongsangnam-do. It was confirmed that Epilobium parviflorum Schreb. (Onagraceae) grew naturally on the islands of Jeollanam-do. Detailed morphological descriptions and geographical distribution of the three taxa are provided.