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Molecular mechanisms of phototropism of higher plants

Research Project

Project/Area Number 10440242
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 植物生理
Research InstitutionOsaka City University

Principal Investigator

IINO Moritoshi  Osaka City University, Graduate School of Science, 大学院・理学研究科, 助教授 (50176054)

Co-Investigator(Kenkyū-buntansha) TARUI Yutaka  Osaka City University, Graduate School of Science, 大学院・理学研究科, 講師 (00236770)
UEMATSU Chiyomi  Osaka City University, Graduate School of Science, 大学院・理学研究科, 講師 (30232789)
TAKANO Makoto  National Institute of Agrobiological Sciences, Department of Plant Biology, 生理機能研究グループ, チーム長 (20355754)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥12,900,000 (Direct Cost: ¥12,900,000)
Fiscal Year 2000: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1999: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1998: ¥8,400,000 (Direct Cost: ¥8,400,000)
Keywordsphototropism / blue light responses / light signal transduction / coleoptiles / rice / auxin / 光信号伝達 / トウモロコシ
Research Abstract

The purpose of the proposed study was to resolve the light signaling mechanism underlying phototropism of higher plants. For this purpose, we undertook molecular genetic investigation using rice (Oryza sativa L) as an experimental material. Mutants impaired in phototropism of coleoptile phototropism were isolated from Y-ray-mutagenized japonica-type rice (cv. Nihonmasari). One of the isolated mutants, named coleoptile phototropism1 (cpt1), showed no coleoptile phototropism and severely reduced root phototropism after continuous stimulation. A map-based cloning strategy and transgenic complementation test were applied to demonstrate that a NPH3-like gene deleted in the mutant corresponds to CPT1. Phylogenetic analysis of putative CPT1 homologs of rice and related proteins indicated that CPT1 has an orthologous relationship with Arabidopsis NPH3. These results, along with those for Arabidopsis, demonstrate that NPH3/CPT1 is a key signal transduction component of higher plant phototropism … More . In an extended study with the cpt1 mutant, it was found that phototropic differential growth, is accompanied by a CPT1-independent inhibition of net growth. Kinetic investigation further indicated that a small phototropism occurs in cpt1 coleoptiles. This response, induced only transiently, was thought to be caused by the CPT1-independent growth inhibition. The ^3H-IAA applied to the coleoptile tip was asymmetrically distributed between the two sides of phototropically responding coleoptiles. However, no asymmetry was induced in cpt1 coleoptiles, indicating that lateral translocation of auxin occurs downstream of CPT1. It is concluded that the CPT1-dependent major phototropism of coleoptiles is achieved by lateral auxin translocation and subsequent growth redistribution. We further characterized another distinct mutant, coleoptile phototropism2 (cpt2). This mutant showed reduced coleoptile phototropism and normal root phototropism. Detailed analysis indicated that the mutant is specifically impaired in the ability to perceive and/or transduce light signal at the coleoptile tip. Map-based cloning of CPT2 gene is now in progress. Less

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (19 results)

All 2005 2004 2003 2001 Other

All Journal Article (8 results) Book (1 results) Publications (10 results)

  • [Journal Article] The rice COLEOPTILE PHOTOTROPISM1 gene encoding an ortholog of Arabidopsis NPH3 is required for phototropism of coleoptiles and lateral translocation of auxin.2005

    • Author(s)
      Haga, K., Takano, M., Neumann, R., Iino, M.
    • Journal Title

      The Plant Cell 17

      Pages: 103-115

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Journal Article] Two distinct signalling pathways participate in auxin-induced swelling of pea epidermal protoplasts.2004

    • Author(s)
      Yamagami, M., Haga, K., Napier, R.M., Iino, M.
    • Journal Title

      Plant Physiology 134

      Pages: 735-747

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Journal Article] Photomorphogenesis of rice seedlings : a mutant impaired in phytochrome-mediated inhibition of coleoptile growth.2003

    • Author(s)
      Biswas, K.K., Neumann, R., Haga, K., Yatoh, O., Iino, M.
    • Journal Title

      Plant and Cell Physiology 44

      Pages: 242-254

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Journal Article] Auxin- and abscisic acid-dependent osmoregulation in protoplasts of Phaseolus vulgaris pulvini.2001

    • Author(s)
      Iino, M., Long, C., Wang, X.
    • Journal Title

      Plant and Cell Physiology 42

      Pages: 1219-1227

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Journal Article] Blue light-dependent osmoregulation in protoplasts of Phaseolus vulgaris pulvini.2001

    • Author(s)
      Wang, X., Haga, K., Nishizaki, Y., Iino, M.
    • Journal Title

      Plant and Cell Physiology 42

      Pages: 1363-1372

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Journal Article] Light-dependent osmoregulation in pea stem protoplasts. Photoreceptors, tissue specificity, ion relationships, and physiological implications.2001

    • Author(s)
      Long, C., Iino, M.
    • Journal Title

      Plant Physiology 125

      Pages: 1-16

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Journal Article] Auxin- and abscisic- acid-dependent osmoregulation in protoplasts of Phaseolus vulgaris pulvini.2001

    • Author(s)
      Iino, M., Long, C., Wang, X.
    • Journal Title

      Plant and Cell Physiology 42

      Pages: 1219-1227

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Journal Article] Phototropism in higher plants.2001

    • Author(s)
      Iino, M.
    • Journal Title

      In EPS Comprehensive Series in Photosciences, Vol.1 Photomovement Elsevier Science

      Pages: 659-811

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Book] Phototropism in higher plants. In EPS Comprehensive Series in Photosciences, Vol.1, Photomovement2001

    • Author(s)
      Moritosh Iino
    • Total Pages
      153
    • Publisher
      Elsevier Science
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Long,C.and Iino,M.: Plant Physiology. 125/1. 1-16 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Iino,M.: "Phototropism in higher plants.In : EPS Comprehensive Series in Photosciences,Photomovement(eds.,D.-P.Hader & M.Lebert)"Elsevier Science. 154 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 飯野盛利: "分担「光を求めて曲がる-光屈性」光が拓く生命科学,第3巻,生命を支える光(佐藤公行・和田正三共編)"共立出版. 13 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Y. Tarui and M. Iino: Advance in Space Research. 24/6. 743-753 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] M. Iino: "Phototropism in higher plants. In:Comprehensive Series in Photosciences (Eds., D.-P. Hader and G. Jori)"Elsevier Science (発表予定). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] 飯野盛利: "分担「光を求めて曲がる-光屈性」光が拓く生命科学、第3巻、生命を支える光(佐藤公行・和田正三編)"共立出版 (発表予定). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] X.Wang and M.Iino: "Interaction of cryptochrome 1,phytochrome and ion fluxes in blue-light-induced shrinking of Arabidopsis hypocotyl protoplasts" Plant Physiology. 117/4. 1265-1279 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] K.Haga and M.Iino: "Auxin-growth relationship in maize coleoptiles and pea internodes and control by auxin of the tissue sensitivity to auxin" Plant Physiology. 117/4. 1473-1486 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Tarui and M.Iino: "Autotropic straightening:occurrence during gravitropism and phototropism of oat coleoptiles" Advance in Space Research. (発表予定). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Iino: "Phototropism in higher plants.In:Comprehensive Series in Photosciences(Eds.,D.-P.Hader and G.Jori)" Elsevier Science(発表予定), (1999)

    • Related Report
      1998 Annual Research Report

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

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