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2005 Fiscal Year Final Research Report Summary

Visualization of dehydration from hardwood fibers at maturation and an analysis of the mechanisms

Research Project

Project/Area Number 16580127
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 林産科学・木質工学
Research InstitutionHokkaido University

Principal Investigator

SANO Yuzou  Hokkaido University, Graduate School of Agriculture, Instructor, 大学院・農学研究科, 助手 (90226043)

Co-Investigator(Kenkyū-buntansha) KISHIMOTO Takao  Hokkaido University, Graduate School of Agriculture, Instructor, 大学院・農学研究科, 助手 (60312394)
Project Period (FY) 2004 – 2005
Keywordshardwood / wood fiber / tracheid / pit / dehydration / scanning electron microscopy
Research Abstract

In dicotyledonous trees, wood fibers are generally dehydrated at or soon after their maturation. The mechanism of this dehydration phenomenon has not been understood, to date. Thus, this study was carried out to visualize the dehydration from hardwood fibers as well as to gain clues to the elucidation of the mechanism. Cryo-scanning electron microscopy demonstrated that wood fibers with minutely bordered smaller pits were almost simultaneously dehydrated at or soon after maturation. In contrast, wood fibers with distinctly bordered larger pits (typical fiber-tracheids and vasicentric tracheids) retained water in their lumina after their maturation. Field-emission scanning electron microscopy revealed that pit membranes between the former type of fibers were often perforated, whereas those between the latter type of fibers were densely packed. These findings suggest that the presence of perforated interfiber pit membranes is a condition to allow the dehydration from the fiber cells at or soon after maturation. In addition, we investigated the composition of gases that are present in the outermost layer of xylem tissues. As a result, we failed to analyze the gas composition reproducibly because artificial leakage of gas samples took place in a tool (syringe) that we used for sample collection. However, it was very likely that the concentration of CO_2 was much higher in the xylem tissue than in atmosphere. Active respiration which would occur just before cell death of wood fibers might be involved in the dehydration from the fiber cells.

  • Research Products

    (6 results)

All 2006 2005 Other

All Journal Article (6 results)

  • [Journal Article] Histochemical study of the chemical composition of vestured pits in two species of Eucalyptus2006

    • Author(s)
      Watanabe Yoko
    • Journal Title

      International Association of Wood Anatomists Journal 27

      Pages: 33-43

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Perforated pit membranes in imperforate tracheary elements of some angiosperms2006

    • Author(s)
      Sano Yuzou
    • Journal Title

      Annals of Botany (印刷中)(2006年6月号掲載予定)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Histochemical study of the chemical composition of vestured pits in two species of Eucalyptus.2006

    • Author(s)
      Watanabe Y, Sano Y, Asada T, Funada R
    • Journal Title

      International Association of Wood Anatomists Journal 27

      Pages: 33-43

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Inter- and intraspecific structural variations among intervascular pit membranes, as revealed by field-emission scanning electron microscopy2005

    • Author(s)
      Sano Yuzou
    • Journal Title

      American Journal of Botany 92

      Pages: 1077-1084

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Inter- and intraspecific structural variations among intervascular pit membranes, as revealed by field-emission scanning electron microscopy.2005

    • Author(s)
      Sano Y
    • Journal Title

      American Journal of Botany 92

      Pages: 1077-1084

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Perforated pit membranes in imperforate tracheary elements of some angiosperms.

    • Author(s)
      Sano Y, Jansen S
    • Journal Title

      Annals of Botany (in press, will appear in june issue of 2006)

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

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Published: 2007-12-13  

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