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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Korean Society of Phycology
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Volume 16, Issue 4 - 00 2001
Volume 16, Issue 3 - 00 2001
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Volume 16, Issue 1 - 00 2001
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New Records of Intertidal Epilithic Cyanobacteria from Hong Kong Shores
Sanjay Nagarkar ;
ALGAE, volume 16, issue 4, 2001, Pages 343~343
As a part of species richness survey of intertidal, epilithic cyanobacteria around Hong Kong shores, the morphology and ecology of seven coccoid species are described, namely Aphanothece microscopica Nageli, Dactylococcopsis raphidioides Hansgirg, Gloeocapsa decorticans (A. Braun) Richter, Gomphosphaeria aponina Kutzingk, Merismopedia elegans A. Braun, Myxosarcina burmensis Skuja, and Synechococcus aeruginosus nageli. Myxosarcina burmensis Skuja belongs to Pleurocasaceae, Pleurocapsales, wheres the remaining species bolong to the order Chroococcales and family Chroococcaceae. All seven species are new records from hong Kong. Except for Gomphosphaeria aponina and Merismopedia elegans, they are recorded for the first time as epiliths from the marine environment. Most of the species were present only during winter and in the mid-and lower eulittoral zones.
A Comparative Stydy of the Morphological Characters and Sequence Data of rbcL Gene in Cosmarium Species
남미라 ; 이옥민 ;
ALGAE, volume 16, issue 4, 2001, Pages 349~349
Casmarium is one of earlist described genera of the placoderm desmids, and one of the largest genera, including over 1,000 species. In this genus, species are traditionally grouped into sections according to the wall features and the shape of semicells. Sequence data for the large subunit of RUBISCO(rbcL) was employed to compare with the section system of this genus based on morphological characters. Parsimony analysis of the rbcL. Sequences data representing 18 taxa, with all positions and changes weighted equally, did not agree with the section system except for a few sections. According to current sequence analysis, most taxa in section I were shown to be in a same clade with those in section II, which were classified by the wall features. Most taxa in section A through F, the system based on the shape of semicells, also turned out to be in a same clade with taxon of another section. Therefore, further study was suggested in the morphological characters of genus Cosmarium.
A Comparative Study of Morphological Characters and Sequences of rbcL Gene in Staurastrum of Desmid
남미라 ; 이옥민 ;
ALGAE, volume 16, issue 4, 2001, Pages 363~363
The genus Staurastrum Meyen includes more recoreded species and subspecific taxa than any of the desmids except Cosmarium. Because of the great morphological variations exhibited by radiate semicells, workers proposed subdivisions of Staurastrum to form either separate genera, or subgenera, This genus has been assigned to two divisions, with sections in each, based on the elongated processes at angles of semicells, the morphology of semicell, the sculpture of cell wall and the shape of sinums. Sequence data for the large subunit of RUBISCO(rbcL) were employed to compare with taxa of two divisions, with sections in each, for evaluating the taxonomic stability of these morphological characters, Parsimory analysis of the rbcL data, with all positions and changes weighted equally, was consistant with two divisions of this genus, but not with sections. Therefore, it isbelieved that the feature of the elongated processes at angles of semicells was a character reflecting the phylogenetic relationships in genus Staurastrum. The morphology of semicell, the sculpture of cell wall and the shape of sinus, which devided each division to sections, are not appropriate characters to be used in section system.
A Taxonomic and Morphological Study on the Freshwater Diamom Genus Synedra in Korea
이경 ; 윤숙경 ;
ALGAE, volume 16, issue 4, 2001, Pages 369~369
The freshwater species of the diatom genus Synedra collected in Korea have been examined by light microscopy. The length and width of the valve, ratio of the valve length/width, number of the striae, shape of the spices, shape of the pseudoraphe and shape of the central area were examined. As a result of these, 19 taxa of Synedroids could be classified 5 types with morphological features: S. cyclopum type 9curved form of the apical axis), S. ulna type (developed form of the valve), S. acus type (delicate and needle shaped form of the valve), S. rumpens type (bilaterally developed form of the central area) and S. pulchella type (developed form of the striae).
Suquence Analysis of Nuclear 18S rDNA from Porphyra pseudolinearis (Rhodophyta) in Korea
Long-Guo Jin ; 김명숙 ; 김영대 ; 김형근 ; 홍용기 ;
ALGAE, volume 16, issue 4, 2001, Pages 379~379
The red alga Porphyra pseudolinearis has dioecious lanceolate fronds that can be collected on rocky shores in upper intertidal zone during winter. Nuclerar 18S ribosomal RNA gene(18S rDNA or SSU rDNA)from the algal tissue was amplified and sequenced. Complete 18S rDNA has an 1823 bp exon and a 584 bp intron. The G+C contents of exon and intron were 49% and 53%, respectively. The exon sequence showed 97.6% homology to the GenBank accession number AB013185 of the Japancese P. pseudolinearis. The intron region that is inserted in downstream between 1805 and 1806 showed 96.4% honology to the AB013185.
Morphology and Reproduction of Heterosiphonia pulchra and H. japonica (Ceramiales, Rhodophyta)
ALGAE, volume 16, issue 4, 2001, Pages 387~387
Two species of Heterosiphonia(Dasyaceae, Ceramiales), H. pulchra (Okamura) Falkenberg and H. japonica Yendo were reported in Korea. The aim of this study was to re-evaluate taxonomic criteria for these two species, based on anatomical features of vegetative and reproductive structures. Samples were collected in places from the lower intertidal to the subtidal zone on coasts of Korea. Heterosiphonia pulchra occurred throughout the year with tetrasporangia and cystocarps, while H. japonica scarcely showed the female and male reproductive structures in the field. Two species share stable and typical characteristics of the family Dasyaceae such as sympodial growth and formation of tetrasporangial stichidia with tetraspores being formed acropetally and whorledly. Heterosiphonia pulchra has some diagnostic features: mono- and polysiphonous pseudolateral branches emerging at every two to four segments, the pericentral cells forming in rhodomelacean sequence, polysiphonous pedicellate stichidia and procarps formed on the determinate branches, which are commonly found in other Heterosiphonia spp. Heterosiphonia japonica, however, shows other characteristics: monopodial pseudolaterals produced at every segment, monosiphonous pedicellate stichidia and procarps formed on the indeterminate branches, which are features seen in Dasysiphonia spp. The latter species has a unique feature with the pericentral cells formed in laterally transverse sequence within the Dasyaceae. The taxonomy of the two species of heterosiphonia and the related species within the genus is discussed.
Phylogenetic Relationships of the Dasyaceae 9Ceramiales, Rhodophyta) Based on Anatomical Characters
ALGAE, volume 16, issue 4, 2001, Pages 411~411
The aim of the current clasdistic analysis was to evaluate the phylogenetic relationships among the 13 genera of the Dasyaceae based on 20 anatomical characters. The results indicated that the Dasya-group (Dasya, Dasysiphonia, Eupogodon and Rhodoptilum) and the heterosiphonia-guoup (Heterosiphonia, Dictyrus and thuretia) would form the two distinct lineages in the Dasyacease. The former shares the several important diagnostic features: the presence of monosiphonous pseudolateral branches, adventitious branches and post-sporangial cover cells as well as procarps formed on the indeterminate branches, and the absence of pericarp initials begore fertilization, whereas the latter has the altermative features for them: having mono-/polysiphonous pseudolateral branches, the absence of adventitious branches, and the formation of presporangial cover cells, the presence of procarps formed on the determinate branches and pericarp initials before fertilization. The phylogenetic relationships among the 13 genera within the Dasyaceae were discussed.
Occurrence and Seasonal Changes of Silica-scaled Chrysophytes in Kachang Dam Reservoir
김한순 ; 황기주 ;
ALGAE, volume 16, issue 4, 2001, Pages 421~421
Occurrence and seasonal changes of silica-scaled chrysophytes in kachang dam reservoir were investigated with using electron microscopy (EM0 and a light microscope. Total ten species were identified by an EM. Diversity of species was high in late spring and autumn and was very low during the summer and winter. Mallomonas caudata was found throughout the year and was present as an abundant population during the short period summer. Whereas the other species were appeared as only a few cells or scales during other sampling periods.
Genetic Diversity of Cultivated Undaria pinnatifida Populations from Korea Based on Allozyme VBariation Analysis
허만규 ; 허홍욱 ; 문성기 ; 최철만 ; 이학영 ;
ALGAE, volume 16, issue 4, 2001, Pages 429~429
The study of genetic diversity was carried out in the cultivated brown algae, undaria pinnatifida (Harvey) suringar. Although this species has bee nregarded as ecologically and economically important one, there is noreport on population structure in Korea. Starch gel electrophoresis was used to investiagate the allozyme variation and genetic structure of ten Korean populations of this species. Of the 18 gentic loci surveyed, six (33.3%) was polymorphic in at leat one population. Genetic diversity was high at the species level (
=0.146), wheres, that of the population level was relatively low ((
=0.068). Nearly 86% of the total genetic diversity in U. pinnatifida was apportioned within populations. The sexual reproduction, high fecundity, and colonization process are proposed as possible factors contributing to high genetic diversity. The indirect estimated of gene flow based on (
Mixed-phase Reproduction o Dasysiphonia chejuensis from Korea: Nuclear DNA Contents and Environmental Factors
최한구 ; 김광영 ;
ALGAE, volume 16, issue 4, 2001, Pages 437~437
Dasysiphonia chejuensis I.K. Lee et West (Dasyaceae, Ceramiales0 showed a mainly Polysiphomia-type history in culture but female plants occasionally formed tetrasporangia. Nuclear DNA contents of tetrasporangial mother cells from normal tetrasporophytes and female/tetrasporangial mixed=phae plants as well as cells of carpogonial branches were estimated from DAPI-staining, using image processing. In frequency distribution patterns, the DAPI-stained nuclear volume(NV) of tetrasporanginal mother cells from female/tetrasporangial mixed-phase plants and normal tetrasporophytes three peaks corresponding to 4C/8C/16C and 8C/16C/32C, respectively. A carpogonium has one nucleus showed three cells of the carpogonial branch have two nuclei. The NV of four cells in carpogonial branches showed two peaks corresponding to 2C and 4C. The polygenomy of the nuclear genome in uninucleate reproductive cells such as tetrasporangia and carpogonia may provide red algae with a genetic buffering mechanism that protects them form potentially lethal mutations during fertilization and meiosis. The most favorable condition for the occurrence of mixed phases was 15℃, 20umol photos m-² ·s-¹ and 16:8 LD, which was also one of the most favorable conditions for the growth of tetraspore germlings, The occurrence of mixed-phase plants, however, was different depending on various environmental factors and developmental stages of each plant in culture and it was generally high in the old stage of plants cultured.
Photosynthetic Activities of a Roof-Top Desiccation Tolerant Cyanobacterium Scytomema geitleri at Varying Hydration Levels
S.N. Tripathi ; J.N. Maurya ;
ALGAE, volume 16, issue 4, 2001, Pages 445~445
Photosynthetic activities of a diazotrophic desiccation tolerant cyanobacterium Scytonoema geitleri growing on rooftops of buildings of the Unibersity campus were studied by monitoring
-fixation, O₂evolution/consumption, DCPIP photoreduction and chlorophyll fluorescence (Fv/Fm) behaviour at various durations and levels of hydration of dry and growing mats. 0 MPa osmotic water potential has been found most favourable for maximum recovery in these parameters. Thylakoids isolated from dry mats when grown at different osmotic water potentials (including 0 MPa) maintained by different sucrose solutions showed more recovery of PS I, than PS II and whole chain electron transports, Matric treatment was found fless effective than osmotic water potential during rehydration. On dehydration, all those parameters, excepting Fv/Fm, which showed faster recovery on rehydration, were found more sensitive to lowering of matric water potentials, hydroxylamine (
) and diphenyl carbazide (DPC) treatments have reflected about repairable changes in the PS II during dehydration.
Screening for Toxic Compounds in the Red Tide Dinoflagellate Cochlodinium polykrikoides: Is It Toxic Plankton?
김창숙 ; 이삼근 ; 김학균 ; 이종수 ;
ALGAE, volume 16, issue 4, 2001, Pages 457~457
In order to confirm the existence of inchthyotoxins in thered tide dinoflagellate Cochlodinium polykrikoides, screening for toxins in the extracts of this cells was conducted by a various bioassay systems and HPLC analysis. The aqueous and lipid-soluble fractions of Cochlodinium extractes did not showed toxicity against mice and fish. In addition, ichthyotoxicity was also not observed in the C. polykrikoides-free media. Particularly, no effects of algal extracts on the growth of lymphoid cells as well as the mammalian mitochondrial respiration were observed. Even through hemolytic activity was detected in lipid-soluble fractions of C. polykrikoides (>100 ug·ml-¹), however, this activity was also appeared in the extracts of the Heterosigma akashiwo which is a well-known non-toxic algae. Moreover, these hemolytic compounds-mediated toxic effects such as fish kill were not found. In the PSP analysis by the fluorometric HPLC system, the test sampes showed peaks indistinguishable from the standard toxins, but all of them wer regarded as false peaks by the HPLC systems withough an oxiaizing reagents. These results fuggest that the mechanism of fish kill by a live C. polykrikoides is distinct from the special ichthyotoxic compounds-mediated effects and C. polykrikoides is one of the non-toxic dinoflagellates.