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Phylogenetic analysis of chromophyte-related colorless flagellates

Research Project

Project/Area Number 08640880
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 系統・分類
Research InstitutionUniversity of Tsukuba

Principal Investigator

INOUYE Isao  Inst. Biol. Sci., University of Tsukuba professor, 生物科学系, 教授 (70168433)

Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1997: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1996: ¥1,600,000 (Direct Cost: ¥1,600,000)
Keywordschromophytes / algae / heterotrophic flagellates / oomycetes / stramenopiles / bicosoecids / 18SrDNA / flagellar apparatus / 黄金色藻 / 食作用 / 卵菌類 / Cafeteria / Developaella
Research Abstract

The chromophytes or hetrokoint algae is a huge assemblage of autotrophic eukaryotes and as big as the green plants. It comprises various classes of chlorophyll c containing algae such as the Chrysophyceae, Bacillariophyceae, Xanthophyceae, Raphidophyceae and Phaeophyceae. In the lineage of the chromophytes, heterotrophic taxa are also included. These are oomycete fungi (pseudofungi), hyphochytrids, labyrhintulids (net slime molds), which were traditionally classified as fungi, and protozoan flagellates bisocoecids. The taxon including both autotrophic chromophytes and heterotrophic fungi and flagellates is called the stramenopiles, and the chromophytes is believed to have arisen from heterotrophic members through acquisition of the chloroplast by secondary endosymbiosis of red-algae related eukaryote.
General ultrastructure and the flagellar apparatus of Cafeteria, a member of the bicosoecids, was examined and compared with chromophyte algae. It was revealed that Cafeteria had homologou … More s flagella/basal bodies and flagellar rootlets. The R3 was especially important, because it was responsible for feeding food particles and food uptake took place in the area between two split bundles of microtubules of the R3 just as in Ochromonas and allied genera (Ochromonadales) in the Chrysophyceae. This result suggested that the phagocytotic ability known in the Chrysophyceae was a symplesiomorphy which appeared in early evolution of the stramenopiles.
Developayella sp. nov. (taxon incertae sedis) was also examined. It also had the R3 similar to Cafeteria and food uptake took place at the same portion of the cell, suggesting the R3-mediated feeding is widely distributed in heterotrophic flagellates of the stramenopiles. In Developayella double helix, a structure similar to that of the oomycete fungi, is present. Phylogenetic analysis suggested that Developayella was a close relative of the oomycete fungi. Based on ultrastructural comparison and 18SrDNA analyses, early evolution of the stramenopiles was discussed. Less

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Inouye,I: "Systematics of Haptophyte Algae in Asia-Pacific Waters"Algae. 12(4). 247-261 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakayama,T.,Marin,B.,Kranz,H.D.,Surek,B.,Huss,V.A.R.,Inouye,I.and Melkonian,M..: "The ancestral position of scaly green flagellates among the green algae (Cholorophyta) is revealed by analyses of nuclear-encoded SSU rRNA sequences"Protista. 149. 368-380 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 井上勲: "藻類の多様性の生物学"内田老鶴圃. 386 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 井上勲: "プランタ 藻類の多様性"研生社. 19-25 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Inouye, I.: "Systematics of Haptophyte Algae in Asia-Pacific Waters."Algae. 12(4). 247-261 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Nakayama, T., Marin, B., Kranz, H. D., Surek, B., Huss, V. A. R., Inouye, I. and Melkonian, M: "The ancestral position of scaly green flagellates among the green algae (Chlorophyta) is revealed by analyses of nuclear-encoded SSU rRNA sequences."Protista. 149. 367-380 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Inouye, I.: "Algal Biodiversity (in Japanese)"Planta. 56. 19-25 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Inouye, I.: "Biology of Algal Biodiversity (in Japanese)"Uchida Rokakuho, Tokyo. 386 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Inouye,I.: "Systematics of Haptophyte Algae in Asia-Pacific Waters." Algae. 12(4). 247-261 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 井上勲: "藻類多様性の生物学" 内田老鶴圃, 386 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Zhang,X.,Watanabe,M.M.and Inouye,I.: "Light and electron microscopy of grazing by Poterioochromonas marhamensis (Chrysophyceae) on a range of phytoplankton taxa." Journal of Phycology. 32. 37-46 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Nakayama,T.,Watanabe,S.,Mitsui,K.,Uchida,H.&Inouye,I.: "The phylogenetic relaitionship between the Chlamydomonadales and Chlorococcales inferred from 18SrDNA sequence data." Phycological Research. 44. 47-55 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] Nakayama,T.,Watanabe,S.and Inouye,I.: "Phylogeny of wall-less green flagellates inferred from 18SrDNA sequence data." Phycological Research. 44. 151-162 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 井上勲: "真核光合成生物の多様性をもたらしたもの" 科学. 66. 225-263 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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