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2007 Fiscal Year Final Research Report Summary

Elucidation of gas diffusion mechanisms in mangroves for adapting to high salinity and application of the mechanisms for developing afforestation methods

Research Project

Project/Area Number 17380193
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Boundary agriculture
Research InstitutionOsaka Prefecture University

Principal Investigator

KITAYA Yoshiaki  Osaka Prefecture University, Graduate School of Life and Environmental Sciences, Professor (60169886)

Co-Investigator(Kenkyū-buntansha) SHIBUYA Toshio  Osaka Prefecture University, Graduate School of Life and Environmental Sciences, Assistant Professor (50316014)
Project Period (FY) 2005 – 2007
KeywordsManaroves / O_2 / Hypocotyls / Roots / Leaf conductance / Afforestation / Transpiration / Photosynthesis
Research Abstract

Hypocotyls of the seedlings can play an important role for early seedling growth. In the present study, we examined the function of oxygen supply from hypocotyls to roots. We determined photosynthetic activity of the hypocotyls of the seedlings, and O_2 concentrations and gas diffusion characteristics in the hypocotyls using young seedlings of Rhizophora mucronata, which is a dominant species in mangrove forests in Southeast Asia.
The gross photosynthetic rates of hypocotyls increased with an increase in light intensity and reached the maximum value of 0.4 μmolCO_2 m^<-2> s^<-1> at a PPFD of 300 μmol m^<-2> s^<-1>, which was 80% of the CO_2 release rate from the hypocotyls in the darkness. The O_2 concentrations in an inner tissue system of hypocotyls were lower than the atmospheric O_2 concentration and lower at the regions closer to roots. The O_2 concentrations in the hypocotyls were 20%, 11%, and 1% when exposed to the air in the light, submerged in the light, and submerged in the darkness, respectively. The longitudinal gas-diffusion rate in hypocotyls was about 10 nmol O_2 s^<-1> in the light regardless of submergence.
Extended submersion of hypocotyls under water and shading of hypocotyls suppressed the leaf conductance and retarded growth of young seedlings. In conclusion, the hypocotyls generate O_2 with photosynthetic action and could transport O_2 to the roots during daytime even when the hypocotyls were submerged under water at a high tide. This function would allow seedlings of mangroves such as Rhizophoraceae having well developed hypocotyls to grow under muddy anaerobic soil conditions in estuaries.

  • Research Products

    (6 results)

All 2007 2006

All Journal Article (1 results) Presentation (4 results) Book (1 results)

  • [Journal Article] Hypocotyls Play an Important Role to Supply Oxygen to Roots in Young Seedlings of Mangroves2006

    • Author(s)
      Y. Kitaya
    • Journal Title

      (In "Greenhouse Gas and Carbon Balances in Mangrove Coastal Ecosystems, Edt. Y. Tateda)

      Pages: 109-117

    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Function of mangrove hypocotyls to supply O2 from the hypocotyls to the roots2007

    • Author(s)
      Y.Kitaya, H.Yoshii, T.Kataoka, T.Shibuya and M.Kiyota
    • Organizer
      日本マングローブ学会2007年度大会
    • Place of Presentation
      東京農業大学
    • Year and Date
      20071124-25
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Function of mangrove hypocotyls to supply O2 from the hypocotyls to the roots2007

    • Author(s)
      Y. Kitaya, H. Yoshii, T. Kataoka, T. Shibuya, M. Kiyota
    • Organizer
      Annual Conference of Japanese Society of Mangrove Sciences in 2007
    • Place of Presentation
      Tokyo, Japan
    • Year and Date
      20071124-25
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] The function of young seedling hypocotyls of the mangrove,Rhizophora mucronata,in a flooded condition2007

    • Author(s)
      Y.Kitaya, H.Yoshii, T.Shibuya and M.Kiyota
    • Organizer
      9th Conference of the International Society for Plant Anaerobiosis
    • Place of Presentation
      宮城県宮城郡松島町
    • Year and Date
      20071119-23
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] The function of young seedling hypocotyls of the mangrove, Rhizophora mucronata, in a flooded condition2007

    • Author(s)
      Y. Kitaya, H. Yoshii, T. Shibuya, M. Kiyota
    • Organizer
      9th Conference of the, International Society for Plant Anaerobiosis
    • Place of Presentation
      Matsusima, Japan
    • Year and Date
      20071119-23
    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] Greenhouse Gas and Carbon Balances in Mangrove Coastal Ecosystems (分担:Hypocotyls Play an Important Role to Supply Oxygen to Roots in Young Seedlings of Mangroves, 109-117)2006

    • Author(s)
      Kitaya Y.(Tateda Y.edt)
    • Total Pages
      257
    • Publisher
      現代図書
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2010-02-04  

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