直干大叶相思的多性状遗传变异分析及早期选择  

Multi-trait Genetic Variation Analysis and Early Selection of Acacia auriculiformis

作　　者：李泽君 LI Zejun(Zhongxi State-owned Forest Farm in Zhangpu,Zhangzhou,Fujian 363200,China)

机构地区：[1]福建省漳浦中西国有林场,福建漳州363200

出　　处：《林业与环境科学》2025年第2期122-126,共5页Forestry and Environmental Science

基　　金：福建省林业科技项目(2024FKJ29);福建省林木种苗科技攻关项目(ZMGG-0709)。

摘　　要：为了解1 a生直干大叶相思Acacia auriculiformis不同家系的生长变异并对其进行早期选择,研究利用SPSS和R软件分析其20个半同胞子代家系胸径、地径、树高的遗传分化程度和遗传力,以遗传力最大的性状作为选择标准,并通过Duncan多重比较法筛选该性状值排名前4的家系,用最佳线性无偏预测法(Best linear unbiased prediction,BLUP)估算该性状的家系BLUP值,选择率为20%。结果表明,树高、胸径和地径在生长发育过程中均出现了较大的分化,变异系数分别为24.41%、36.20%和25.47%;3个性状在区组间均达到极显著差异(P<0.01);家系间胸径差异显著(P<0.05),而树高和地径均为极显著差异(P<0.01),各性状的家系遗传力为0.3871~0.5159,其中树高和地径受到中等强度的遗传控制,胸径受到中弱强度的遗传控制,地径遗传力最大。相关分析表明各生长性状之间均呈极显著正相关关系。以地径作为此次选择标准,多重比较结果显示,家系13、15、5和19号的地径位列前4;选出地径的BLUP值较高的家系为13、15、5和19号,该结果与多重比较结果一致,这些家系表型生长性状发育较好,且具有更好的遗传优势。To investigate the growth variation of 1-year-old Acacia auriculiformis and to carry out early se-lection,SPSS and R software were used to analyze the genetic variation of main growth traits of 20 half-sib families of A.auriculiformis.The trait with the highest heritability was used as the selection criterion,and the top 4 families with the trait value were screened by Duncan′s multiple comparisons.The Best linear unbiased prediction(BLUP)methods were used to estimate the BLUP breeding value of this trait.The selection rate was 20%.The results showed that the tree height,DBH,and ground diameter showed significant differentiation during growth and development,and the coefficient of variation was 24.41%,36.20%,and 25.47%,respec-tively.There were significant differences among the three traits(P<0.01),among families,there were signifi-cant differences in DBH trait(P<0.05),and there were significant differences in tree height and ground diame-ter traits(P<0.01).The family heritability of each trait ranged from 0.3871 to 0.5159,in which tree height and ground diameter were controlled by medium strength,and DBH was controlled by medium weak strength,and ground diameter had the highest heritability.Correlation analysis showed that there were significant positive correlations among the growth traits.Using the ground diameter trait as the selection criterion,the multiple comparison results indicated that families of No.13,15,5,and 19 ranked top 4 in ground diameter.Four fami-lies of No.13,15,5,and 19 with higher BLUP breeding values of ground diameter were selected,which was completely consistent with the results of multiple comparisons.The phenotypic growth traits of these families were well developed and had better genetic advantages.

关 键 词：直干大叶相思 遗传变异 BLUP育种值 早期选择 

分 类 号：S722.33[农业科学—林木遗传育种]