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Studies on the species evolution in Paramecium caudatum

Research Project

Project/Area Number 10041155
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field 遺伝
Research InstitutionInstitute of Biological Sciences, University of Tsukuba

Principal Investigator

TAKAHASHI Mihoko  Inst. Biol. Sci., Univ. Tsukuba, Professor, 生物科学系, 教授 (90006453)

Co-Investigator(Kenkyū-buntansha) TSUKII Yuuji  Institute of Biology, Hosei University, Professor, 第一教養部, 教授 (20163777)
MIKAMI Kazuyuki  Environmental Education Center, Miyagi College of Education, Professor, 環境教育実践研究センター, 教授 (90009177)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 1999: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 1998: ¥3,200,000 (Direct Cost: ¥3,200,000)
KeywordsParamecium / syngen / Mating type / Species evolution / RAPD pattern / Natural strains / ゾウリムシのシンゲン / 種分化 / 種間雑種 / 種問雑種
Research Abstract

To study the species evolution in Paramecium caudatum, many natural strains at different geographic places are necessary, and establishment by recovery of the lost syngen (genetical species) is essential. Therefore, I carried out collection of natural strains in USA, Canada and Uruguay Republic.
1. The collections were carried out at 197 points around the Five lakes and the eastern part of USA, and at 78 points in Uruguay Republic. P. caudatum was obtained from 34 sampling points, and 222 isolation lines were established.
2. Three groups consisting in complementary mating types, that is "syngen", were discovered. These three syngens are independent from known syngens. They are tentatively called as syngen a, syngen b and syngen d. New strains belonging to syngen 1, syngen 3, syngen 5 and syngen 12 were also obtained.
3. Surprisingly, a problem in identification of species revealed from the analyses of some strains, for example UC131 or UC151. They look like P. caudatum very much in size of cells and external morphology, but their RAPD patterns are quite different from many strains of P. caudatum. They have 2-5 vesicular type micronuclei, two contractile vacuoles and living in fresh water. These characteristics are not identical to the known biological species. Further studies are necessary whether they are really new biological species or not.
4. Some strains show inter-syngen mating reactions. This evidence emphasizes an importance of establishment of the syngen standard strains.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report

Research Products

(28 results)

All Other

All Publications

  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1999 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1999 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1999 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1999 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1999 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1999 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      1999 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1999 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1999 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1999 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1999 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1999 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1999 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      1999 Final Research Report Summary
  • [Publications]

    • Related Report
      1999 Annual Research Report
  • [Publications]

    • Related Report
      1999 Annual Research Report
  • [Publications]

    • Related Report
      1999 Annual Research Report
  • [Publications]

    • Related Report
      1999 Annual Research Report
  • [Publications]

    • Related Report
      1999 Annual Research Report
  • [Publications]

    • Related Report
      1999 Annual Research Report
  • [Publications]

    • Related Report
      1998 Annual Research Report
  • [Publications]

    • Related Report
      1998 Annual Research Report
  • [Publications]

    • Related Report
      1998 Annual Research Report
  • [Publications]

    • Related Report
      1998 Annual Research Report
  • [Publications]

    • Related Report
      1998 Annual Research Report
  • [Publications]

    • Related Report
      1998 Annual Research Report
  • [Publications]

    • Related Report
      1998 Annual Research Report
  • [Publications]

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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