摘要
【目的】本研究旨在系统评价23份白榆无性系的遗传变异规律,筛选综合性状优良的无性系,为白榆高效育种提供依据。【方法】以9年生白榆无性系测定林为试验材料,调查胸径、树高、材积等7个生长与形质性状,采用变异分析、相关分析、主成分分析及聚类分析方法对参试无性系进行综合评价。【结果】(1)参试白榆无性系各生长与形质性状变异丰富,其中材积性状的变异系数最大,达35.4%;(2)相关分析结果显示,胸径、树高、材积三者间均存在极显著正相关关系;(3)主成分分析共提取出4个主成分,累计贡献率为87.6%,分别对应生长量、冠幅、枝下高和通直度4个性状维度;(4)基于主成分分析构建的综合评价模型,成功筛选出48、106、53、5和172号共5个优良无性系,这些无性系具有生长速度快、树干通直等优良特性。【结论】白榆无性系具有较大的遗传改良潜力,本研究筛选出的5个优良无性系可作为后续白榆区域化试验的核心试验材料,为白榆遗传改良工作提供实践支撑。
【Objective】This study aims to systematically evaluate the genetic variation rules of 23 Ulmus pumila L.clones,screen clones with excellent comprehensive traits,and provide a basis for efficient breeding of Ulmus pumila L.【Method】Taking a 9-yearold Ulmus pumila L.clone test forest as the experimental material,7 growth and form traits such as DBH(diameter at breast height),tree height and volume were investigated.Variation analysis,correlation analysis,principal component analysis and cluster analysis were used to comprehensively evaluate the tested clones.【Result】1)The growth and form traits of the tested Ulmus pumila L.clones were rich in variation,among which the volume trait had the largest coefficient of variation,reaching 35.4%;2)Correlation analysis showed that there were extremely significant positive correlations among DBH,tree height and volume;3)Principal component analysis extracted 4 principal components with a cumulative contribution rate of 87.6%,corresponding to 4 trait dimensions:growth increment,crown width,clear bole height and straightness;4)Based on the comprehensive evaluation model constructed by principal component analysis,5 excellent clones(No.48,106,53,5 and 172)were successfully screened out,which had excellent characteristics such as fast growth and straight trunk.【Conclusion】Ulmus pumila L.clones have great potential for genetic improvement.The 5 excellent clones screened in this study can be used as the core experimental materials for subsequent regionalization tests of Ulmus pumila L.,providing practical support for the genetic improvement of Ulmus pumila L.
作者
李翠华
李亚鹏
王健
付茵茵
王丽
乔艳辉
仲伟国
李宪忠
庄若楠
LI Cuihua;LI Yapeng;WAGN Jian;FU Yinyin;Wang Li;QIAO Yanhui;ZHONG Weiguo;LI Xianzhong;ZHUANG Ruonan(Jinxiang County Forestry Protection and Development Service Center,Jining,Shandong 272200;Jinxiang County State-owned Baiwa Forest Farm,Jining Shandong 272200;Shandong Academy of Forestry,Jinan Shandong 250014;Shandong Provincial Institute of Territorial Spatial Planning,Jinan Shandong 250014)
出处
《山东林业科技》
2026年第1期28-35,共8页
Journal of Shandong Forestry Science and Technology
关键词
白榆
遗传变异
主成分分析
综合评价
Ulmus pumila L.
genetic variation
principal component analysis
comprehensive evaluation
