• ALGAE
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• v.17 no.3
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• pp.135-144
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• 2002

Scytosiphonaceae is an acetocarpalean brown algal family, that is a recent focus of synstematics and marine biodiversity. We describe Petalonia zosterifolia and Scytosiphon gracilis from Korea for the first time. P. zosterifolia occurred on the East coast, and had flat, linear and solid thalli. S. gracilis was found in Jeju, and had cylindircal to flat and hol-low thalli. However, these two species are so similar that it is difficult to identify by morphology alone. In order to determine if the nuclear DNA reveals the distinctness of both species and to know their phylogenies, the ITS region sequences were newly detrmined in 22 samples of P. zosterifolia, Scytosiphon gracilis, and other three members of the genera from Korea. We found 0.12% variation among samples of P. zosterifolia from different locations, and no variation between S. gracilis samples from diferent years, but extensive interspecific divergences (13.62-22.83%) of each species to other members in Petalonia and Scytosiphon . The ITS sequence dta consistently showed a close relationship between P. zosterifolia and S. gracilis. This result is congruent with morphology and with the published data of plastid rbc and partial nrDNA large subunit gene sequences, and suggests that P. zosterifolia and S. gracilis might have diverged from the most recent common ancestor.

• Proceedings of the Korea Society of Environmental Biology Conference
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• 2002.05a
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• pp.23-23
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• 2002

• Journal of Plant Biology
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• v.34 no.1
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• pp.45-51
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• 1991

Morphological variability was quantified for Endarachne binghamiae J. Agardh from five local populations collected in December, 1989 and in March, 1990. The sampling sites were chosen at intervals of 50'N along the east coast of Korea. Fifty individuals were haphazardly collected for the relationship between the blade length and reproduction, among which twenty five individuals were randomly selected for morphological variation. The Korean plants of E. binghamiae had the capacity of reproduction at an early stage of growth. The holdfast diameter and the plurangial length showed clinal variation of increment from the north to the south whereas the cryptostomata from the south to the north. The holdfast diameter, the blade thickness, the number of plurangial blades and the cryptostomata increased from December to March, when the blade length decreased. Endarachne is distinguished by the densely interwoven hypha I cells in the medulla, [our to eighteen rows of the plurangial compartments, and absence of paraphyses between plurangia. Therefore E. binghamiae should not be combined into Petalonia, but rather the Soviet plants of P. zosterijolia may be renamed as a taxon belonging to the genus Endarachne.rachne.

• Natural Product Sciences
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• v.18 no.2
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• pp.130-136
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• 2012

In the present work, we have collected 19 species of macroalgae (9 Phaeophta and 10 Rhodophyta) f rom all around of Korea: Dictyopteris divaricata, D. prolifera, Myelophycus cavus, Papenfussiella kuromo, Petalonia zosterifolia, Petrospongium rugosum, Rugulopteryx okamurae, Sargassum fulvellum, S. muticum, Callophyllis japonica, Gloiopeltis tenax, Gracilaria longissima, Gracilaria vermiculophylla, Grateloupia asiatica, Grateloupia lanceolata, Grateloupia sparsa, Grateloupia turuturu, Grateloupia sp, and Polyopes affinis. The macroalgal species were extracted by 70% ethanol (EtOH) for 24 h and evaluated its inhibitory effects on ${\alpha}$-glucosidase. Among ethanol extracts, Myelophycus cavus showed the most effectively inhibitory activity ($IC_{50}$, 2.17 ${\mu}g/ml$) against ${\alpha}$-glucosidase, followed by Sargassum fulvellum (<$IC_{50}$, 8.13 ${\mu}g/ml$), Dictyopteris prolifera ($IC_{50}$, 16.66 ${\mu}g/ml$), Rugulopteryx okamurae ($IC_{50}$, 50.63 ${\mu}g/ml$), and Petrospongium rugosum ($IC_{50}$, 101.62 ${\mu}g/ml$). Furthermore, MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) assay showed no cytotoxicity on mouse pre-adipocytes cell line (3T3-L1). These results suggest that some edible macroalgae merit further evaluation for clinical usefulness as anti-diabetic functional foods.