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1992 Fiscal Year Final Research Report Summary

Studies on systematic relationship of diatoms based on their sexual reproduction in culture.

Research Project

Project/Area Number 03640578
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 植物形態・分類学
Research InstitutionUniversity of Tsukuba

Principal Investigator

HARA Yoshiaki  Univ. of Tsukuba, Biological Sciences, Associate Professor, 生物科学系, 助教授 (60111358)

Co-Investigator(Kenkyū-buntansha) CHIHARA Mitsuo  Japanese Red Cross College of Nursing, Professor, 教授 (60000147)
Project Period (FY) 1991 – 1992
KeywordsDiatoms / Life cycle / Systematic relationship / Sexual reproduction / Auxospore
Research Abstract

Objectives of this research project are the followings; 1)Inducing the gametogenesis of diatoms under laboratory culture conditions, 2)Analysis of the systematic relationship of diatoms based on their structures of auxospore coverings, 3) and based on their life cycle patterns, in particular to their sexual reproduction processes.
We could accumulate the significant results of four taxa; Melosila moniliformis var. octagona, Actinocyclus sp., Thalassiosira lacustris and Eunotia tropica, for analizing the systematic and phylogenetic relationship of diatoms. These are briefly reported, focusing on their sexual reproduction processes.
M. moniliformis var. octagona: monoecious, four sperms hologeneusly born from the mother cell(new finding), auxospore formed by a sperm with a flagellum penetrating into an oogonium, scally perizonia covering with the auxospore in which a large initial vegetative cell is produced.
Actinocyclus sp.: monoecious, four sperms merogenously formed from the mother cell(30-50um), auxospore formed by the same manner as M. moniliformis var. octagona, and covered with scally perizonia(new finding), bearing an initial of the vegetative cell(90-130um).
Thalassiosira lacustris: monoecious, eight sperms merogenously formed from the mother cell, auxospore(ca.30um) formed by the same manner as M. moniliformis var. octagona, and covered with scally perizonia(new finding), bearing an initial vegetative cell(ca.80um).
Eunotia tropica: dioecious(first case in the Protoraphidioideae), pairing cells producing a gamete in each, gametes fusing and becoming a auxospore covered with band-shaped perizonia which possess similar pattern of notches to those of scally ones in a part.

  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] IDEI,M.& CHIHARA,M: "Successive Obserrations on the Fertilization of a centric Diatom Melosira moniliformis var octagona" Bot.Mag.Tokyo. 105. 649-658 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] KAMIYA,M.DOI,K.HARA,Y & CHIHARA,M.: "Taxonomic studies onUlva pertusa(chlorophyceae).I. Morphological studies" Jpn.J Phycol.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] DOI,K.,KAMIYA,M.HARA,Y.& CHIHARA,M.: "Taxonomic studies Ulva pertusa(Chlorophyceae)II.Morphological studies." Jon.J.Phycol.

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 出井 雅彦,千原 光雄: "珪藻の有性生殖と系統" 遺伝. 45. 39-45 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 原 慶明,石田 健一郎,恵良田 真由美: "ヌクレオモルフ-新しい細胞像-" 植物細胞工学. 4(6). 9-18 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 原 慶明: "生物の世界を概観する" Agri-Bio.6. 12-14 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Idei, M. & Chihara, M.: "Successive observations on the fertilization of a centric diatom Melosira moniliformis var. octagona." Bot. Mag. Tokyo. 105. 649-658 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Idei, M. & Chihara, M.: "Sexual reproduction of diatoms and their systematics." Heredity. 45(5). 39-45 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kamiya, M., Doi, K., Hara, Y. & Chihara, M.: "Taxonomic studies on Ulva pertusa (Chlorophyceae). I. Morphological studies." Jpn. J. Phycol.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Doi, K., Kamiya, M.,Hara, Y. & Chihara, M.d: "Taxonomic studies on Ulva pertusa (Chlorophyceae). II. Isozyme analysis." Jpn. J. Phycol.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hara, Y., Erata, M. & Ishida, K.: "Nucleomorphs -- New plant cell images of an evolutinonary chimaera --" Plant cell technology. 4(6). 9-18 (1992)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1994-03-24  

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