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<p>Growth traits and survival rates in trees depend on environmental conditions, including macro- and micro-environmental factors. To increase forest productivity by tree breeding, it is essential to gain a deeper understanding of genetic and environmental influences, such as growth traits and survival rates. In the present study, age-related trends in the variance components of stem diameter, tree height, and survival rate, as well as the possibility of selecting superior productive families, were investigated using four progeny test sites of 28 open-pollinated families derived from <i>Chamaecyparis obtusa</i> plus-tree clones. Radial growth patterns differed depending on snowfall. In addition, survival rates tended to decrease with snowfall, especially at younger ages. The narrow-sense heritability of growth traits was 0.1 or more at most ages, whereas that of survival rates ranged from 0.000 to 0.051. At 30&#xa0;years of stand age, growth traits and survival rates were not genetically correlated, suggesting that families with both superior growth traits and survival rates can be selected separately. Based on the results of the principal component analysis and cluster analysis, all families were categorized into four groups with differences in genetic performance for productivity among sites. Families exhibiting superior productivity in all sites or specific sites were found, indicating that the selective planting of genotypes or progenies with high productivity is important to increase forest productivity through tree breeding of <i>C. obtusa</i>. The findings obtained in the present study suggest that forest productivity in <i>C. obtusa</i> can be improved by selectively planting the appropriate progenies.</p>

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Effects of genetics and environment on growth traits and survival rate of Chamaecyparis obtusa planted in four progeny test sites

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Yusuke Takahashi,
  • Michinari Matsushita,
  • Akira Tamura,
  • Miyoko Tsubomura,
  • Makoto Takahashi

摘要

Growth traits and survival rates in trees depend on environmental conditions, including macro- and micro-environmental factors. To increase forest productivity by tree breeding, it is essential to gain a deeper understanding of genetic and environmental influences, such as growth traits and survival rates. In the present study, age-related trends in the variance components of stem diameter, tree height, and survival rate, as well as the possibility of selecting superior productive families, were investigated using four progeny test sites of 28 open-pollinated families derived from Chamaecyparis obtusa plus-tree clones. Radial growth patterns differed depending on snowfall. In addition, survival rates tended to decrease with snowfall, especially at younger ages. The narrow-sense heritability of growth traits was 0.1 or more at most ages, whereas that of survival rates ranged from 0.000 to 0.051. At 30 years of stand age, growth traits and survival rates were not genetically correlated, suggesting that families with both superior growth traits and survival rates can be selected separately. Based on the results of the principal component analysis and cluster analysis, all families were categorized into four groups with differences in genetic performance for productivity among sites. Families exhibiting superior productivity in all sites or specific sites were found, indicating that the selective planting of genotypes or progenies with high productivity is important to increase forest productivity through tree breeding of C. obtusa. The findings obtained in the present study suggest that forest productivity in C. obtusa can be improved by selectively planting the appropriate progenies.