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Evolutionary Morphological and Molecular Systematical Study of Rheophytes

Research Project

Project/Area Number04640637
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 Tokyo

Principal Investigator

KATO Masahiro  University of Tokyo, Faculty of Science ; Associate Professor, 理学部, 助教授 (20093221)

Project Period (FY) 1992 – 1993
Project Status Completed(Fiscal Year 1993)
Budget Amount *help
¥2,100,000 (Direct Cost : ¥2,100,000)
Fiscal Year 1993 : ¥800,000 (Direct Cost : ¥800,000)
Fiscal Year 1992 : ¥1,300,000 (Direct Cost : ¥1,300,000)
KeywordsRheophyte / Morphological Evolution / Adaptation / Heterochrony / Leaf / Gametophyte / 比較形態 / ヤシャゼンマイ / 幼胞子体
Research Abstract

1.A Comparative leaf anatomical study of tropical rheophytes and closely related dryland species demonstrated that the rheophytes have smaller mesophyll cells, epidermal cells, and intercellular space as well as the thicker cuticular layr and epicuticular waxs, than the dryland species. These anatomical features are strongly correlated to the narrow leaves of rheophytes.
2.During the leaf development of the rheophytic Osmunda lancea and the dryland O.japonica, whereas they are similar at the cell increment stage, there is a distinct difference in the cell enlargement stage. The cell increment stage in O.lancea is shorter than in O.japonica, suggesting heterochrony(progenensis).
3.In order to examine the adaptive strategy of rheophytic gametophytes, a comparative developmental study of gametophytes of O.lancea and O.japonica was made. The gametophytes of O.lancea grow faster to reach reproductive maturity and produce sporophytes at higher frequency than those of O.japonica. The rheophytic gametophyte takes a strategy different from that of the dryland gametophyte.
4.In the field the dryland O.japonica is removed from a rheophytic zone during a young (1-year old) developmental stage of sporophyte. Morphological and anatomical differences of leaves between O.lancea and O.japonica appear at the 5th or 6th youngest leaf stage, corresponding with the populational change in the field.
5.A broad-leaved variant of the rheophytic Tectaria lobbii shows quite a small genetic divergence from the rheophyte and a remarkable anatomical similarity to dryland species.

Report

(3results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report

Research Products

(11results)

All Other

All Publications

  • [Publications] Kato,M.: "Leaf anatomy of tropical fern rheophytes,with its evolutionary and ecological implications" Canadian Journal of Botany. 70. 165-174 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Imaichi,R.: "Comparative leaf development of Osmunda lancea and O.japonica(Osmundaceae):heterochronic origin of rheophytic stenophylly" Botanical Magazine Tokyo. 105. 199-213 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hiyama,T.: "Comparative development of gametophytes of Osmunda lancea and O.japonica(Osmundaceae):adaptation of rheophilous fern gametophyte" Botanical Magazine Tokyo. 105. 215-225 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Kato,M.: "A broad-leaved variant of the fern rheophyte,Tectaria lobbii" International Journal of Plant Science. 153. 212-216 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Imaichi,R.: "Comparative leaf morphology of young sporphytes of rheophytic Osmunda lancea and dryland O.japonica" Journal of Plant Research. 106. 37-45 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Kato, M.& Imaichi, R.: "Leaf anatomy of tropical fern rheophytes, with its evolutionary and ecological implications" Can.J.Bot.70. 165-174 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Imaichi, R.& Kato, M.: "Comparative leaf development of Osmunda lancea and O.japonica (Osmundaceae) : heterochronic origin of rheophytic stenophylly" Bot.Mag.Tokyo. 105. 199-213 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Hiyama, T., Imaichi, R.& Kato, M: "Comparative development of gametophytes of Osmunda lancea and O.japonica (Osmundaceae) : adaptation of rheophilous fern gametophytes" Bot.Mag.Tokyo. 105. 215-225 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Kato, M.& Imaichi, R.: "A broad-leaved variant of the fern rheophyte, Tectaria lobbii" Int.J.Plant Sci.153. 212-216 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Imaichi, R.& Kato, M.: "Comparative leaf morphology of young sporophytes of rheophytic Osmunda lancea and dryland O.japonica" J.Plant Res.106. 37-45 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] R.Imaichi and M.Kato: "Comparative Leaf Morphology of Young Sporophytes of Rheophytic Osumnda lancea and Dryland O.japonica" Journal of Plant Research. 106. (1993)

    • Related Report
      1992 Annual Research Report

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Published : 1992-04-01   Modified : 2016-04-21  

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