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RISS 인기검색어
- 검색키워드
- 저자 : Taizo Motomura (검색결과 4 건)
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Cho, Tao Oh,Taizo Motomura,Boo, Sung Min 한국식물학회 2001 Journal of Plant Biology Vol.44 No.1
We compared the morphology of all four members of Pelvetia and Silvetia (Fucaceae, Phaeophyta), with an emphasis on phylogenetic relationships. Silvetia is segregated from Pelvetia because it has two, longitudinally divided eggs in the oogonium. In contrast, the eggs of the genus Pelvetia are transversally divided. A cladistic analysis, based on 17 morphological features, shows that Pelvetia is closely related to Hesperophycus and Pelvetiopsis, as are three species of Silvetia. We can infer from the cladistic tree and biogeographic information that some silvetian ancestor populations from the northern Pacific region likely evolved to S. babingtonii in northern Japan and then moved to Korea and California (USA), where S. siliquosa and S. compressa, respectively, diverged. Our morphological study corroborates the DMA-based phylogeny and the ensuing taxonomy for the two genera. These results demonstrate the necessity for systematically revising the family Fucaceae to emphasize egg development, rather than egg number, in the oogonium, as a diagnostic character.
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Tatyana A. Klochkova,곽민석,한종원,Taizo Motomura,Chikako Nagasato,김광훈 한국조류학회I 2013 ALGAE Vol.28 No.2
A new cold-adapted Arctic strain of Haematococcus pluvialis from Blomstrandhalvøya Island (Svalbard) is described. This strain is predominantly always in non-motile palmelloid stage. Transmission electron microscopy showed the presence of very thick cell wall and abundant lipid vesicles in the palmelloids, including red and green cells. The external morphology of the non-motile palmelloid and motile bi-flagellated cells of our strain is similar to H. pluvialis; however it differs from H. pluvialis in physiology. Our strain is adapted to live and produce astaxanthin in the low temperature (4- 10°C), whilst the usual growth temperature for H. pluvialis is between 20-27°C. Phylogenetic analysis based on 18S rRNA gene data showed that our strain nested within the Haematococcus group, forming a sister relationship to H. lacustris and H. pluvialis, which are considered synonymous. Therefore, we identified our Arctic strain as H. pluvialis.
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Klochkova, Tatyana A.,Kwak, Min Seok,Han, Jong Won,Motomura, Taizo,Nagasato, Chikako,Kim, Gwang Hoon The Korean Society of Phycology 2013 ALGAE Vol.28 No.2
A new cold-adapted Arctic strain of Haematococcus pluvialis from Blomstrandhalv${\o}$ya Island (Svalbard) is described. This strain is predominantly always in non-motile palmelloid stage. Transmission electron microscopy showed the presence of very thick cell wall and abundant lipid vesicles in the palmelloids, including red and green cells. The external morphology of the non-motile palmelloid and motile bi-flagellated cells of our strain is similar to H. pluvialis; however it differs from H. pluvialis in physiology. Our strain is adapted to live and produce astaxanthin in the low temperature ($4-10^{\circ}C$), whilst the usual growth temperature for H. pluvialis is between $20-27^{\circ}C$. Phylogenetic analysis based on 18S rRNA gene data showed that our strain nested within the Haematococcus group, forming a sister relationship to H. lacustris and H. pluvialis, which are considered synonymous. Therefore, we identified our Arctic strain as H. pluvialis.
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Intercellular transport across pit-connections in the filamentous red alga Griffithsia monilis
Kim, Gwang Hoon,Nagasato, Chikako,Kwak, Minseok,Lee, Ji Woong,Hong, Chan Young,Klochkova, Tatyana A.,Motomura, Taizo The Korean Society of Phycology 2022 ALGAE Vol.37 No.1
Intercellular nutrient and signal transduction are essential to sustaining multicellular organisms and maximizing the benefits of multicellularity. It has long been believed that red algal intercellular transport of macromolecules is prevented by the protein-rich pit plug within pit-connections, the only physical connection between cells. Fluorescein isothiocyanate-dextran and recombinant green fluorescence protein (rGFP) of various molecular sizes were injected into vegetative cells of Griffithsia monilis using a micromanipulator, and intercellular transport of the fluorescent probes was examined. Pit-connections were found to provide intercellular transport of tracers at rates comparable to plasmodesmata in other organisms. The time necessary for the transport to an adjacent cell was dependent on the molecular size and the direction of the transport. Fluorescent dextran of 3 kDa was transported to adjacent cells in 1-2 h after injection and migrated to all cells of the filament within 24 h, but fluorescent dextran of 10-20 kDa took 24 h to transfer to neighboring cells. The migration occurred faster towards adjacent reproductive cells and to apical cells than basally. Fluorescent tracers above 40 kDa and rGFP was not transported to neighboring cells, but accumulated near the pit plug. Our results suggest that pit-connections are conduit for macromolecules between neighboring cells and that these size-specific conduits allow intercellular communication between the vegetative cells of red algae.
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