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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
The Korean Society of Phycology
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Volume & Issues
Volume 15, Issue 6 - 00 2000
Volume 15, Issue 4 - 00 2000
Volume 15, Issue 3 - 00 2000
Volume 15, Issue 2 - 00 2000
Volume 15, Issue 1 - 00 2000
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Mixed-Phase Reproduction in Antithamnion sparsum Tokida(Ceramiaceae, Rhodophyta) from Korea
김광훈 ; 이인규 ;
ALGAE, volume 15, issue 4, 2000, Pages 183~183
The life history of Antithamnion sparsum Tokida (Ceramiaceae, Rhodophyta) was investigated in four different populations of Korea. Mixed-phase reproduction and bisexuality were observed in haploid and diploid phases of field collected as well as cultured plants. The spores from haploid male/tetrasporangial plants exhibited two kinds of sex differentiation; becoming all males or male and female plants showing 1:1 sex ratio. The haploid gametophytic plants showed male:female = 1:1 sex ratio independent of environmental factors. The occurrence of mixed-phase plants, however, was different depending on environmental factors and developmental stage of each plant. In diploid plants, the sexual reproductive structures occurred temporarily at early stage of spore germination. In haploid plants, however, it occurred consistently at mature male plants. Ploidy of nuclear phase of each isolate was examined by video interfaced image processor.
Developmental Aspects of Tetrasporogenesis and Tetraspore Release in Dictyopteris australis (Sonder) Askensay (Dictyotales, Phaeophyta)
Gunwant Bhamrah ; Inderdeep Kaur ;
ALGAE, volume 15, issue 4, 2000, Pages 195~195
The plants of Dictyopteris australis (Sonder) Askensay are large, ribbon-like, dichotomously branched with a distinct midrib : The wing portion of the thallus is 2 or 3 celled thick and midrib is about 5 celled thick. The deflexed lines of hairs borne on both surfaces of the thallus show tetrasporangia at various stages of development. Tetrasporangia are partially embeddded and possess at maturity, a three layered wall with varying amounts of alginic acid and sulphated polysaccharides. The tetrasporangial cytoplasm shows abundant physodes, sulphated polysaccharides and vacuoles of various shapes and sizes. A reduction division results in the formation of tetraspores which are released by a highly coordinated mechanism. The outer layer of the tetrasporangium ruptures and the middle layer forms a stalk, temporarily holding the released tetraspore mass to the parent thallus. The tetraspores which are initially enclosed in middle and inner layer are later set free. The older thalli also show the formation of vegetative plants that remain attached to the parent thallus by means of branched rhizoids.
Characterization of Novel Thioredoxin-like Proteins in Porphyra yezoensis
이은경 ; 김용진 ;
ALGAE, volume 15, issue 4, 2000, Pages 201~201
Red algae Prophyra are well adapted to environmental stress such as salt and drought stress. The expressed sequence tags of Porphyra yezoensis were previously generated in order to identify genes involed in stress-tolerant machinery. One of the EST clones, p254 clone, showed homology to thioredoxin and was called thioredoxin-like protein. The expression pattern of the thioredoxin-like protein under stress conditions was examined by RT-PCR. It was highly expressed under drought stress, whereas little changes were observed under salt stress. The multialignment of the amino acid sequence of thioredoxin family in various species including Prophyra indicated the thioredoxin-like protein was quite different from other thioredoxins. Futhermore, the thioredoxin-like protein revealed no substantial homology to chloroplast thrioredoxin of P. yezoensis. We obtained two transcripts of thioredoxin-like protein from RT-PCR process. Both of the transcripts contained identical N-terminal region but were quite different in C-terminal region. Based on the result, thioredoxin genes of P. yezoensis are presumed to exist as several isoforms like other thioredoxin genes.
Epilithic Diatom Flora of the Pukchong-Namdaechon River of North Korea
ALGAE, volume 15, issue 4, 2000, Pages 209~209
Epilithic diatoms, which are attached on the stones or pebbles, were collected in the Pukchong-Namdaechon River of North Korea to examine with the microsocopy. This study was conducted from October 1997 to July 1998. One hundred and forty-one taxa representing 29 genus were identified and presented with light microscopy photography, and their abundance and distribution were discussed. The importand diatom groups were genus Achnanthes, Fragilaria and Cymbella comprising 89% abundance of epilithic diatoms. Dominantly leading species were Achnanthes convergens H. Kob., A. minutissima K
tz., A. alteragracillima Lange-B., Fragilaria inaequalis (H. Kob) Lange-B. The seasonality of epilithic diatomas wasn't clear
Epipsammic Diatom Flora of the Pukchong-Namdaechon River of North Korea
ALGAE, volume 15, issue 4, 2000, Pages 233~233
Epipsammic diatoms, which are attached on the sand grains, were collected at the mouth of the Pukchong-Namdaechon River of North Korea, from October 1997 to July 1998. One hundred and fifty-two diatom taxa were identified and their abundance and distribution were discussed. Sand grains were primarily colonized by diatoms with raphe system below 20㎛ in their size. Important diatom taxa were as followed - Nitzschin sp. 3, Achnanthes alteragracillima (Meist). Lange-B., A. minutissima K
tz, A. lanceolata ssp. frequentissima Lange-B., A. delicatula (K
tz.) Grun., Navicula gregaria Donk., N. minima Grun., Fragilaria pinnata Ehr.
Epiphytic Diatom Flora of Lakes around Kumho District of North Korea
ALGAE, volume 15, issue 4, 2000, Pages 255~255
Eipipytic diatoms were collected from October 1997 to July 1998 in three lakes- Lake Hyunkum, Lake Daein and Lake Homanpo-around the Kumho District, which is the nuclear power contruction site in North Korea. One hundred and eighty six taxa were identified and presented as light microscopy photography, and their abundance and distribution were discussed. The important diatom taxa were Nitzschia paleaceae Grun., Achnanthes minutissima K
Dynamics of Epilithic Algal Community in the Geum River, Korea
김지환 ; 이석준 ; 오희목 ;
ALGAE, volume 15, issue 4, 2000, Pages 287~287
Species composition and standing crops of epilithic algae were investigated at six stations in the Geum River in 1999. A total of 160 species (49 Chlorophyceae, 5 Euglenophyceae, 92 Chrysophyceae, and 14 Cyanophyceae) was identified. The standing crops of epilithic algal species renged 17.3-776.1 × 10³ cells·
, and averaged 227.2 × 10³ cells·
. The minmum standing crops of epilithic algae was recorded in July (averaged 105.5×10³ cells·
) and the maximum in November (322.0×10³ cells·
). Diatoms significantly contributed to the proportion of standing crops during the investigated period. Among 17 dominant species in standing crops, Aulacoseira granulata, Cyclotella meneghiniana, Melosira varians, Navicula pupula, Nitzschia palea, Oscillatoria tenuis, Scenedesmus quadricauda, and Synedra ulna have been known as typical algal indicators for organic pollution of water. The species diversity index (H') of epilithic algal community showed the minimum in September as 1.56 and the maximum in November as 2.11.
Effects of Planktivorous Fish and Zooplankton on the Morphology of the Small Cryptomonad Plagioselmis prolonga var. nordica (Crytophyceae)
김백호 ; 최민규 ; Noriko Takamura ;
ALGAE, volume 15, issue 4, 2000, Pages 299~299
Two morphs of the small cryptomonad Plagioselmis prolonga var. nordica with a posterior tail, were observed during summer and fall in Lake Kasumigaura, Japan. The tail shortened in mesocosms stocked with planktivorous silver carp (Hypophthalmichthys molitrix Val.) and elongated by more than 50% in mesocosms from which silver carp were removed. The density of Plagioselmis cells increased significantly upon fish stocking and decreased upon fish removal. The tail. length was negatively correlated with algal abundance and positively correlated with crustacean densities, but there was no correlation with nutrient levels or physical environment parameters in the mesocosms. The variation in fail length was induced by the presence / absence of fish, but was not related to their density. However, silver carp manipulation strongly affected the density of the majority of zooplankters and, interestingly, there was a strong correlation between zooplankton density and tail-length change in Plagioselmis. We propose a possible herbivore-induced defense mechanism triggered by the top predator, silver carp. Further research is necessary to better understand the underlying mechanisms. Most importantly, the effect of silver carp on Plagioselmis morphology needs to be differentiated from those of zooplankton and Plagioselmis densities.
Quantification of DSP Toxins in the Mussels of the Jinhae Bay by Fluorometric HPLC Analysis and Protein Phosphatase Inhibition Assay
안득균 ; 박영식 ; 박종규 ; 이종수 ; 이진애 ;
ALGAE, volume 15, issue 4, 2000, Pages 307~307
The diarrhetic shellfish toxins in the midgut of mussels (Mytilus edulis) were quanitified by fluorometric high performance liquid chromatography analysis (HPLC-FD) and protein phosphatase inhibition assay (PPIA) during the summer 1999 at the 4 stations in the Jinhae Bay, Korea. Dinophysis acuminata and D. fortii were identified in the present study and the cell density of Dinophysis was up to 1,650 cells /l. Dimophysis acuminata was the dominant species with the relative abundance ranging from 94% to 100%. The contents of okadaic acid (OA) and dinophysistoxin -1 (DTX-1) were not detectable in all samples by HPLC-FD analysis. However, total DSP in the mussel varied from 13.5 to 96.7 ng/g midgut gland by PPIA. The detection limit of the PPIA was 20 pg/g midgut gland, and the assay will be useful for routine monitoring of DSP toxins at trace level. The cell density of Dinophysis in the water column was not responsible for the OA concentrations in the mussels in the present study.