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Studies on the biological significance of the spiral architecture of sperms of plants assigned to the land-plant lineage.

Research Project

Project/Area Number 09440272
Research Category

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

Allocation TypeSingle-year Grants
Section一般
Research Field 生物形態・構造
Research InstitutionUniversity of Tsukuba

Principal Investigator

HORI Terumitsu  Institute of Biological Sciences, University of Tsukuba, Professor, 生物科学系, 教授 (90057563)

Co-Investigator(Kenkyū-buntansha) NOZAKI Hisayoshi  Department of Biological Sciences, Graduate School of Science, University of Tokyo, Associate Professor, 大学院・理学系研究科, 助教授 (40250104)
MIYAMURA Shin-ichi  Institute of Biological Sciences, University of Tsukuba, Assistant Professor, 生物科学系, 講師 (00192766)
INOUYE Isao  Institute of Biological Sciences, University of Tsukuba, Professor, 生物科学系, 教授 (70168433)
Project Period (FY) 1997 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥13,000,000 (Direct Cost: ¥13,000,000)
Fiscal Year 2000: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1999: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1998: ¥5,700,000 (Direct Cost: ¥5,700,000)
Fiscal Year 1997: ¥2,900,000 (Direct Cost: ¥2,900,000)
Keywordsmale gamete / sperm / bryophyte / peridophyte / green alga / gymnosperm / 藻類
Research Abstract

This project was conducted to evaluate the biological significance of the spiral architecture of sperms in sexual reproduction of plants which are assigned to the land-plant lineage.
(1) All sperms produced by plants belonging to the land-plant evolutional lineage are fundamentally spiral either in their external architecture or intracellular organization, or both. The most ovbious features are found in their coiled streamlined body of sperm cell and spiral arrangement of flagella on the surface of cell body. The internal ones are reflected on the intracellular arrangement of various cell organelles, including cell nucleus, anterior giant mitochondrion, and basal bodies.
(2) Biflagellate sperms are produced in charophytes, mosses, liverworts, and a few lycophytes.. In biflagellate sperms two flagella are inserted at the cell anterior and their basal bodies are positioned slightly downward from the cell tip, thus resulting in an asymmetrical profile of cell architecture. Two basal bodies … More are monomorphic and parallel, staggered in an anterior to posterior fashion in contrast to those of sperms of other photosynthetic organisms.
(3) Multiflagellated sperms are found in most ferns and a few gymnosperms, including Ginkgo and cycads. In multiflagellated sperms flagella and their basal bodies are arranged in spiral fashion with several rows. The cell body coils to the left when viewed from the anterior. Basal bodies are distributed on the MLS in different manners, indicating the difference of their role in swimming movement.
(4) The sperm that have such structural features only swimm forward in spiral fashion, but does not have ability of back-swimming to avoid material as those of green algal swarmers of other evolutionary lineages.
(5) The coiled structure of body and spiral arrangement of flagella may effectively work to drill down through the neck and ventral canals of the archegonium in the archegoniate fertilization, but significance of these morphological characteristics in male gametes of some charophytes, including Coleochaete, Klebsormidium, is uncertain. Less

Report

(5 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • 1997 Annual Research Report

Research Products

(27 results)

All Other

All Publications

  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2000 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2000 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2000 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2000 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2000 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(和文)」より

    • Related Report
      2000 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2000 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2000 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2000 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2000 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2000 Final Research Report Summary
  • [Publications] 「研究成果報告書概要(欧文)」より

    • Related Report
      2000 Final Research Report Summary
  • [Publications]

    • Related Report
      2000 Annual Research Report
  • [Publications]

    • Related Report
      2000 Annual Research Report
  • [Publications]

    • Related Report
      2000 Annual Research Report
  • [Publications]

    • Related Report
      2000 Annual Research Report
  • [Publications]

    • Related Report
      2000 Annual Research Report
  • [Publications]

    • Related Report
      2000 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
      1997 Annual Research Report
  • [Publications]

    • Related Report
      1997 Annual Research Report
  • [Publications]

    • Related Report
      1997 Annual Research Report
  • [Publications]

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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