Scholarlink

<p>Chinese fir (<i>Cunninghamia lanceolata</i>) is one of China’s most important fast-growing coniferous timber species and has reached the fourth generation of genetic improvement in Zhejiang Province, China. Despite its long history of cultivation and breeding, advanced-generation populations face challenges, including incomplete evaluation of germplasm resources and limited understanding of genetic diversity, population structure, and core germplasm formation. To address these gaps, 453 clonal accessions spanning first to fourth-generation breeding populations conserved in Zhejiang were analyzed and revealed that these populations maintain relatively high genetic diversity, although diversity first declined and then increased slightly with successive generations, following the trend G1 &gt; G4 &gt; G3 &gt; G2. Populations derived from more diverse provenances or larger sample sizes exhibited higher diversity, consistent with observations in other major production regions of China. Strong population structure was detected, with germplasm clustered into three subgroups: Subgroup I contained 195 accessions, predominantly from G2 and G4 (82.05%); Subgroup II comprised 110 accessions, mainly from G3 (67.27%); Subgroup III included 148 accessions, largely from G1 (85.81%). This pattern indicates that subgroup differentiation primarily reflects generational divergence. A core germplasm set of 59 accessions representing 13.02% of the total collection and retaining full allelic richness was established using the M-strategy. This core set effectively reduces genetic redundancy and provides a foundation for the systematic utilization of germplasm resources and the development of new elite lines.</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

Assessing the maintenance and renewal of genetic diversity in Cunninghamia lanceolata breeding populations through core collection construction

  • 期刊论文

  • 发表日期：

    2026年3月19日

查看全文
  • Sen Cao,
  • Jingyong Ji,
  • Bin Shen,
  • Guowei Hu,
  • Yin Liu,
  • Guiping He,
  • Zhichun Zhou,
  • Zhen Zhang

摘要

Chinese fir (Cunninghamia lanceolata) is one of China’s most important fast-growing coniferous timber species and has reached the fourth generation of genetic improvement in Zhejiang Province, China. Despite its long history of cultivation and breeding, advanced-generation populations face challenges, including incomplete evaluation of germplasm resources and limited understanding of genetic diversity, population structure, and core germplasm formation. To address these gaps, 453 clonal accessions spanning first to fourth-generation breeding populations conserved in Zhejiang were analyzed and revealed that these populations maintain relatively high genetic diversity, although diversity first declined and then increased slightly with successive generations, following the trend G1 > G4 > G3 > G2. Populations derived from more diverse provenances or larger sample sizes exhibited higher diversity, consistent with observations in other major production regions of China. Strong population structure was detected, with germplasm clustered into three subgroups: Subgroup I contained 195 accessions, predominantly from G2 and G4 (82.05%); Subgroup II comprised 110 accessions, mainly from G3 (67.27%); Subgroup III included 148 accessions, largely from G1 (85.81%). This pattern indicates that subgroup differentiation primarily reflects generational divergence. A core germplasm set of 59 accessions representing 13.02% of the total collection and retaining full allelic richness was established using the M-strategy. This core set effectively reduces genetic redundancy and provides a foundation for the systematic utilization of germplasm resources and the development of new elite lines.