Differences in the Relationship between Intermate Distance and Mating Frequency and the Diversity of the Pollen Pool among Neighboring Mother Trees of Fagus crenata.

  • Hanaoka So
    Laboratory of Forest Ecology, United Graduate School of Agricultural Science, Gifu University
  • Hakamada Yasuko
    Laboratory of Forest Ecology, Graduate School of Agricultural Science, Gifu University
  • Mukai Yuzuru
    Faculty of Applied Biological Sciences, Gifu University

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Other Title
  • ブナ(Fagus crenata)近距離母樹間における両親間距離と交配頻度の関係および花粉プールの多様性の差異
  • ブナ Fagus crenata キンキョリ ボジュ カン ニ オケル リョウシン カン キョリ ト コウハイ ヒンド ノ カンケイ オヨビ カフン プール ノ タヨウセイ ノ サイ

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Abstract

We analyzed differences in the relationship between the intermate distance and the cumulative mating frequency, the allelic richness of the pollen pool, and effective number of pollen parents among neighboring trees of Faugs crenata. Six mother trees we studied were located relatively close together but under slightly different microenvironments. We determined genotypes of 823 seedlings derived from the mother trees at seven microsatellite loci. We assigned seedling paternity and estimated the three parameters of pollen dispersal. Patterns of increases in the cumulative mating frequency with the increasing intermate distance varied among the mother trees although short-distance matings were frequently observed. The pollen immigration rates from outside the 4-ha study plot varied from 15.7 to 33.8%. Among the mother trees, the allelic richness of pollen pools was very similar, with values ranging from 8.524 to 12.803, and the effective number of pollen parents (Nep) varied from 2.941 to 16.340. In addition, the rate of unsound seeds production was high in mother trees with low Nep value. In conclusion, patterns of pollen dispersal and seed soundness were similar among neighboring mother trees but varied in accordance with their microenvironments.

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