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1994 Fiscal Year Final Research Report Summary

Studies on fine structure and function of rice photosynthetic apparatus

Research Project

Project/Area Number 05454046
Research Category

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

Allocation TypeSingle-year Grants
Research Field 作物学
Research InstitutionOchanomizu University

Principal Investigator

TOYAMA Susumu  Department of Biology Ochanomizu University Professor, 理学部, 教授 (20017213)

Project Period (FY) 1993 – 1994
Keywordschloroplasts / thylakoids / degreening / dedifferentiation / proplastids / epibrassinolide / plastoglobules / plastid-proteins
Research Abstract

Interconversion of rice plastids was studies by electron microscopy and SDS-PAGE of plastid proteins. From electron microscopic observation, degreening process from chloroplasts to proplastids was a reverse change of greening from proplastids to chloroplasts. During the structural changes of plastids, distinctive proteins are synthesized and decomposed. It is suggested that these proteins are concernde in structural support and interconversion of plastids.
To analysis a participation of brassinolide in photosynthesis, the intercellular distribution of 14-C-epibrassinolide in plant cells was investigated. The radioactivity was high in chloroplast fraction. Secondly, localization of 14-C in chloroplasts was determined. The radioactivity of thylakoid fraction was highest in plastid fraction and increased with the passage of time.
A distinctive feature of plastid development in rice cultured cells i starch grain production synchronized with thylakoid formation. Starch grains remain through developmental process of plastids, but disappear in dedifferentiation stage. Another one is plastoglobule-less proplastids which resulted from chloroplast dedifferentiation.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] N.Nishikawa,S.Toyama: "The uptake and transport of ^<14>C-labeled epbrassinolide in intact seedling" J.Plant Res.107. 125-130 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Toyama,R.Kitagawa: "Localization of ^<14>C-epibrassinolide in epicotyls of cucumber." Jpn.J.Crop.Sci.63(ext 2). 213-214 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Ikeda,M.Fujita,S.Toyama: "Fine structural analysis on interconversion of plastids in cullus cultures." Jpn.J.Crop.Sci.63(ext 2). 261-262 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Nishikawa and S.Toyama: "The uptake and transport of 14-C epibrassinilide in intact seedlings" J.Plant Research. 107. 125-130 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Toyama and R.Kitagawa: "Localization of 14-C epibrassinolide in epicotyls of cucumber" Jpn.J.Crop Sci.63 (ext2). 213-214 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Ikeda, M.Fujita and S.Toyama: "Fine structural analysis on interconversion of plastids in cullus cultures" Jpn.J.Crop Sci.63 (ext2). 261-262 (1994)

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

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Published: 1996-04-15  

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