Evaluation of Male Flower Production in Sugi (<i>Cryptomeria japonica</i>) Plus Tree Clones Selected from a Kanto Breeding Region

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  • Tsubomura Miyoko
    Forest Tree Breeding Center, Forestry and Forest Products Research Institute
  • Fukatsu Eitaro
    Kyushu Regional Breeding Office, Forest Tree Breeding Center, Forestry and Forest Products Research Institute
  • Watanabe Atsushi
    Faculty of Agriculture, Kyushu University

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Other Title
  • 関東育種基本におけるスギ精英樹クローン雄花着花量の評価
  • カントウイクシュ キホン ニ オケル スギセイヒデキ クローン オバナチャク カリョウ ノ ヒョウカ
  • Evaluation of Male Flower Production in Sugi (Cryptomeria japonica) Plus Tree Clones Selected from a Kanto Breeding Region

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Abstract

Male flower production was evaluated with gibberellin treatment in plus tree clones (a total of 765 clones and 2,205 individuals) of Sugi (Cryptomeria japonica D. Don) planted in the crossing garden at Forest Tree Breeding Center. All the individuals were genotyped with SSR markers. The male flower production of the individual trees was evaluated by nine evaluators using male flower index (from 1: no or very little male flowers setting to 5: abundant). The male flower indexes of the genotyped clones were distributed in a bell curve and the average was 3.06. The accuracy of the evaluation of the male flower index was decreased by the un-trained evaluators, while its accuracy was increased by an increase in the number of evaluators, suggesting the importance of the replication of evaluators. The correlation of the male flower production with Gibberellin treatment between years was high and it was rarely influenced the climate compared to natural flowering. Gibberellin treatment was considered to be appropriate for the evaluation of male flower production.

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