Genetic Diversity and Mating System of Regionally Endangered <i>Pinus parviflora</i> var. <i>parviflora</i> Populations in the Kanto District, Japan

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  • Isobe Sanga
    Department of Forest Science, Graduate School of Agriculture, Utsunomiya University Chiba Prefectural Southern Part Forestry Office
  • Aizawa Mineaki
    Department of Forest Science, Faculty of Agriculture, Utsunomiya University
  • Hisamoto Yoko
    The University of Tokyo Chiba Forest, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Karukome Tsutomu
    The University of Tokyo Chiba Forest, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Saito Hiroshi
    Kanagawa Prefecture Natural Environment Conservation Center
  • Nakayama Chisa
    Department of Forest Science, Graduate School of Agriculture, Utsunomiya University Forestry Experiment Station, Department of Forestry and Environmental Affairs, Gunma Prefectural Government
  • Endo Ryota
    Chiba Prefectural Agriculture and Forestry Research Center Forestry Research Insititute
  • Goto Susumu
    Education Research Center, The University of Tokyo Forests, Graduate School of Agricultural and Life Sciences, The University of Tokyo
  • Ohkubo Tatsuhiro
    Department of Forest Science, Faculty of Agriculture, Utsunomiya University

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Other Title
  • 地域絶滅の危惧される関東地方のヒメコマツの遺伝的多様性と交配様式
  • チイキ ゼツメツ ノ キグ サレル カントウ チホウ ノ ヒメコマツ ノ イデンテキ タヨウセイ ト コウハイ ヨウシキ

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Abstract

Several Pinus parviflora var. parviflora populations in the Kanto district were thought to be regionally endangered and affected by decreased population size and habitat fragmentation. In order to develop conservation strategies, this study aimed to assess the genetic diversity and mating system of their populations, including three endangered (Boso, Tanzawa, and Hanazono) and one intact (Koshinzan) populations, using four nuclear microsatellite (SSR) loci. The level of genetic diversity of mature trees of the Boso and Tanzawa populations was similar to that of the intact population. Analysis of the mating system revealed that the proportion of selfed progeny of saplings in the endangered populations was higher (34.2–65.5%) than that in the intact population (15.1%) and that the endangered populations had a lower effective number of pollen donors (1.7–5.6) compared to the intact population (15.6). Multilocus heterozygosity (MLH) analysis indicated that the frequency of low MLH was high in saplings less than 5 years old. The mode of MLH increased with the life history process. These findings suggest that mature trees in the endangered populations mostly retain high levels of genetic diversity, but the decline in the number of mature trees has resulted in increased selfing and decreased selfed saplings possibly due to inbreeding depression.

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