Scholarlink

<p>Ensuring sustainable forestry necessitates the establishment of an efficient management procedure to enhance seed production capacity. In forests, light environments are often heterogeneous in both vertical and horizontal directions, and therefore light is important resources for tree growth and reproduction. This study evaluated the impact of increasing light intensity on shoot growth, survival, and gibberellin-induced male strobili and seed cone production in second-generation plus tree clones of <i>Chamaecyparis obtusa</i>. The findings revealed that male strobili and seed cone production were bolstered by increasing light intensity. When the relative photosynthetic photon flux density (rPPFD) exceeded 50%, over half of the clones were inclined to produce seed cones. Positive relationships were also confirmed between shoot growth and survival in relation to rPPFD, and it was demonstrated that the likelihood of canopy decline significantly increases when rPPFD falls below 5–10%. The study estimated the broad-sense heritability for each trait and the genotype-specific response curves along light intensity, and found relatively small G×E effect and large broad-sense heritability on reproductive traits. The insights gained from this study regarding the light-related responses of <i>C. obtusa</i> will be instrumental in selecting superior clones for practical use and enhancing the management process of next-generation seed orchards.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

The effects of light intensity on the shoot growth, survival, and reproductive traits of Chamaecyparis obtusa clones

  • 期刊论文

  • 发表日期：

    2025年8月7日

查看全文
  • Michinari Matsushita,
  • Miyoko Tsubomura,
  • Megumi Kimura,
  • Yusuke Takahashi,
  • Kodai Ogawa,
  • Mineko Ohira,
  • Akira Tamura

摘要

Ensuring sustainable forestry necessitates the establishment of an efficient management procedure to enhance seed production capacity. In forests, light environments are often heterogeneous in both vertical and horizontal directions, and therefore light is important resources for tree growth and reproduction. This study evaluated the impact of increasing light intensity on shoot growth, survival, and gibberellin-induced male strobili and seed cone production in second-generation plus tree clones of Chamaecyparis obtusa. The findings revealed that male strobili and seed cone production were bolstered by increasing light intensity. When the relative photosynthetic photon flux density (rPPFD) exceeded 50%, over half of the clones were inclined to produce seed cones. Positive relationships were also confirmed between shoot growth and survival in relation to rPPFD, and it was demonstrated that the likelihood of canopy decline significantly increases when rPPFD falls below 5–10%. The study estimated the broad-sense heritability for each trait and the genotype-specific response curves along light intensity, and found relatively small G×E effect and large broad-sense heritability on reproductive traits. The insights gained from this study regarding the light-related responses of C. obtusa will be instrumental in selecting superior clones for practical use and enhancing the management process of next-generation seed orchards.