杉木单交F1代的表型变异及杂种优势分析
Analysis of F1 representative variation and heterosis of Chinese fir
万柯慧 1徐德志 1边黎明 1张龙 2陈志强1
作者信息
- 1. 南京林业大学林木遗传育种全国重点实验室,江苏 南京 210037;南京林业大学南方现代林业协同创新中心,江苏 南京 210037
- 2. 福建省洋口国有林场,福建 顺昌 353211
- 折叠
摘要
为定向创制杉木变异、开展家系内优良单株选择,以杉木优良杂交组合 6421×27 及其 6 年生单交F1 代群体为研究对象,对表征其形态、生长及材性的 12 个表型性状进行变异分析,探讨杉木优良种质形态、生长与材性性状的表型变异规律,以及性状之间的相关关系.结果表明:杉木F1 代群体的 12 个表型性状的变异系数范围为 8.21%～37.97%,5 个性状的变异系数达 15%以上.在 66 对性状的相关关系中,中等强度的正相关关系占 36.36%;木材基本密度的变异系数为 8.21%,与其余 11 个性状均无显著相关性;131株F1 子代表现出正负两个方向的中亲优势,8个性状存在显性遗传效应,中亲优势率范围为-31.18%～90.44%,其中一级侧枝数存在明显的超亲优势;聚类分析把 131 株F1 子代分为 3 个大类群、6 个亚群,各类群特征明显.杉木杂交子代在生长和分枝性状上具有较大的变异,浓密宽冠型杉木在幼龄期有明显的生长优势,杉木一级侧枝数存在明显的杂种优势,形态性状具有显性遗传效应.
Abstract
For targeted variation creation in Chinese fir and selection of superior individuals within families,this study targeted the 6421 by 27 elite crosses and their 6-year F1 progeny from a single cross.Variation analysis was conducted on phenotypic values for 12 traits indicative of morphology,growth,and wood properties to explore phenotypic variation behaviors and inter-trait relationships in superior Chinese fir germplasm.Results revealed variation coefficients for the 12 traits in the F1 population from 8.21%to 37.97%,with five traits exceeding 15%.Among 66 trait correlations,36.36%showed moderate positive relationships.Basic wood density displayed a coefficient of variation of 8.21%,correlating non-significantly with the other 11 traits.In total,131 F1 offsprings displaying mid-parental heterosis in both directions,presented eight traits exhibiting dominant effects,and heterosis rates ranging from-31.18%to 90.44%,notably with first-order lateral branch number showing significant over-dominance.Cluster analysis divided the 131 F1 offsprings into three major and six sub-clusters,each with precise characteristics.F1 hybrids of Chinese fir showed substantial variation in growth and branching traits,with dense and broad-crowned firs having a pronounced growth advantage in the early stages.First-order lateral branch numbers in Chinese fir demonstrated apparent hybrid vigor,and their morphological traits showed dominant inheritance.
关键词
杉木/单交子代/表型变异/杂种优势/遗传效应/聚类分析Key words
Chinese fir/single-crossed offspring/phenotypic variation/hybrid vigor/genetic effect/cluster analysis引用本文复制引用
基金项目
"十四五"国家重点研发计划课题(2022YFD2200201)
国家自然科学基金面上项目(32171818)
出版年
2024
国家科技期刊平台
NSTL
万方数据