• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Studies on gene flow and inbreeding depression in Magnolia stellata for its conservation

Research Project

Project/Area Number 16380100
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 林学・森林工学
Research InstitutionNagoya University

Principal Investigator

TOMARU Nobuhiro  Nagoya University, Bioagricultural Sciences, Professor (50241774)

Co-Investigator(Kenkyū-buntansha) ISHIDA Kiyoshi  Forestry and Forest Products Research Institute, Kansai Research Center, Forest Ecology Group, Forest Ecology Group Leader(Researcher) (10343790)
山本 進一  名古屋大学, 大学院・生命農学研究科, 理事(研究職) (60191409)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥10,000,000 (Direct Cost: ¥10,000,000)
Fiscal Year 2006: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2005: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 2004: ¥4,700,000 (Direct Cost: ¥4,700,000)
Keywordsendangered species / gene flow / inbreeding depression / genetic structure / flowering phenology / pollen limitation / inbreeding / conservation / マイクロサテライト / シデコブシ / 他殖率 / 遺伝的変異 / 花粉流動 / 父性解析 / 遺伝的分化 / サイズ構造 / クローン成長 / 空間自己相関
Research Abstract

The objective of this research project was to elucidate gene flow via pollen and inbreeding depression to establish a baseline for conservation of a threatened species, Magnolia stellata, using the methods with microsatellite markers in molecular ecological genetics. The findings are as follows :
1. Genets that are large and located in well-lit sites tend to have many flowers, and blossom both earlier and longer. Large numbers of flowers increase the attractiveness of genets for pollinators and then female reproductive success, and this outweighs the negative effects of geitonogamy.
2. Genets, which apparently produced new ramets through clonal growth (sprouting and layering), were generally composed of several large ramets and many small ramets. Small genets showed within-population genetic structure, suggesting spatially limited seed dispersal. The excess homozygotes in the small genets may be due to genetic substructuring and/or inbreeding, and the reduction in homozygote frequency from the small to large genets may be due to loss of genetic structure and/or inbreeding depression.
3. The level of genetic differentiation among populations within a metapopulation for nuclear DNA was less than half that for chloroplast DNA, suggesting that pollen flow, as well as seed dispersal, has significantly reduced genetic differentiation among populations. Paternity analysis of seeds showed that contemporary pollen flow was greatly restricted by the distance between parents. Although most pollen flow occurred within the study population, pollen flow from outside the population occurred with a low frequency, indicating that the populations were linked by gene flow.
4. Seed production in the study small population is strictly limited by elevated pollen shortage, selfing, and genetic deterioration through genetic drift and inbreeding, which accelerate the risk of extinction.

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (20 results)

All 2008 2007 2005 2004 Other

All Journal Article (20 results)

  • [Journal Article] Relationships between flowering phenology and female reproductive success in the Japanese tree species Magvcolia stellata2008

    • Author(s)
      Setsuko, S.
    • Journal Title

      Botany 86・3

      Pages: 2645-2653

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Relationships between flowering phenology and female reproductive success in the Japanese tree species Magnolia stellata2008

    • Author(s)
      Setsuko, S.
    • Journal Title

      Botany 86-3

      Pages: 2645-2653

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Population differentiation and gene flow within a metapopulation of a threatened tree, Magnolia stellata (Magnoliaceae)2007

    • Author(s)
      Setsuko, S.
    • Journal Title

      American Journal of Botany 94・1

      Pages: 128-136

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Reduced seed production, inbreeding, and pollen shortage in a small population of a threatened tree, Magnolia stellata2007

    • Author(s)
      Hirayama, K.
    • Journal Title

      Biologica lConservation 136・2

      Pages: 315-323

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 絶滅危惧樹木シデコブシにおけるメタ集団内の遺伝子流動パター2007

    • Author(s)
      鈴木 節子
    • Journal Title

      林木の育種 223

      Pages: 7-13

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Population differentiation and gene flow within a metapopulation of a threatened tree, Magnolia stellata(Magnoliaceae)2007

    • Author(s)
      Setsuko, S.
    • Journal Title

      American Journal of Botany 94-1

      Pages: 128-136

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Reduced seed production, inbreeding, and pollen shortage in a small population of a threatened tree, Magnolia stellata2007

    • Author(s)
      Hirayama, K.
    • Journal Title

      Biological Conservation 136-2

      Pages: 315-323

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 絶滅危惧樹木シデコブシにおけるメタ集団内の遺伝子流動パターン2007

    • Author(s)
      鈴木節子
    • Journal Title

      林木の育種 233

      Pages: 7-13

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Population differentiation and gene flow within a metapopulation of a threatened tree, Magnolia stellata (Magnoliaceae)2007

    • Author(s)
      Setsuko, S., Ishida, K., Ueno, S., Tsumura Y., Tomaru, N.
    • Journal Title

      American Journal of Botany 94・1

      Pages: 128-136

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Reduced seed production, inbreeding, and pollen shortage in a small population of a threatened tree, Magnolia stellata2007

    • Author(s)
      Hirayama, K., Ishida, K., Setsuko, S., Tomaru, N.
    • Journal Title

      Biological Conservation (in press)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Effects of pollen shortage and self-pollination on seed production of an endangered tree, Magnolia stellata2005

    • Author(s)
      Hirayama, K.
    • Journal Title

      Annals of Botany 95

      Pages: 1009-1015

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Development of microsatellite markers in Magnolia stellata. (Magnoliaceae), a threatened Japanese tree2005

    • Author(s)
      Setsuko, S.
    • Journal Title

      Conservation Genetics 6・2

      Pages: 317-320

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Effects of pollen shortage and self-pollination on seed production of an endangered tree, Magnolia stellata2005

    • Author(s)
      Hirayama, K.
    • Journal Title

      Annals of Botany 95-6

      Pages: 1009-1015

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Development of microsatellite markers in Magnolia stellata.(Magnoliaceae), a threatened Japanese tree2005

    • Author(s)
      Setsuko, S.
    • Journal Title

      Conservation Genetics 6-2

      Pages: 317-320

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Development of microsatellite markers in Magnolia stellata. (Magnoliaceae), a threatened Japanese tree.2005

    • Author(s)
      Setsuko, S., Ueno, S., Tsumura Y., Tomaru, N.
    • Journal Title

      Conservation Genetics 6・2

      Pages: 317-320

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Size distribution and genetic structure in relation to clonal growth within a population of Magnolia tomentosa Thunb.(Magnoliaceae)2004

    • Author(s)
      Setsuko, S.
    • Journal Title

      Molecular Ecology 13・9

      Pages: 2645-2653

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Size distribution and genetic structure in relation to clonal growth within a population of Magnolia tomentosa Thunb.(Magnoliaceae)2004

    • Author(s)
      Setsuko, S.
    • Journal Title

      Molecular Ecology 13-9

      Pages: 2645-2653

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Size distribution and genetic structure in relation to clonal growth within a population of Magnolia tomentosa Thunb. (Magnokiaceae)2004

    • Author(s)
      Setsuko, S., Ishida, K., Tomaru, N.
    • Journal Title

      Molecular Ecology 13・9

      Pages: 2645-2653

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Genetic variation and differentiation in populations of a threatened tree, Magnolia stellata: factors influencing the level of within-population genetic variation

    • Author(s)
      Tamaki, I.
    • Journal Title

      Heredity (in press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Genetic variation and differentiation in populations of a threatened tree, Magnolia stellata : factors influencing the level of within-population genetic variation

    • Author(s)
      Tamaki, I.
    • Journal Title

      Heredity (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary

URL: 

Published: 2004-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi