短枝木麻黄半同胞家系苗期遗传变异及选择  

Genetic Variation and Selection of Casuarina equisetifolia Half-sib Families at Seedling Stage

作　　者：徐惠昌 聂森[1] 余锦林 尤龙辉 叶功富[1] 张航晓 程分生 苏亲桂 XU Huichang;NIE Sen;YU Jinlin;YOU Longhui;YE Gongfu;ZHANG Hangxiao;CHENG Fensheng;SU Qingui(Fujian Academy of Forestry Sciences,Fuzhou,Fujian 350012,China;Forestry College,Fujian Agriculture and Forestry Uni-versity,Fuzhou,Fujian 350002,China;Fuzhou Forestry Administration,Fuzhou,Fujian 350007,China;Chihu State-owned Protective Forestry Farm in Hui’an County,Quanzhou,Fujian 362131,China)

机构地区：[1]福建省林业科学研究院,福建福州350012 [2]福建农林大学林学院,福建福州350002 [3]福州市林业局,福建福州350007 [4]福建省惠安赤湖国有防护林场,福建泉州362131

出　　处：《热带作物学报》2023年第8期1596-1604,共9页Chinese Journal of Tropical Crops

基　　金：福建省属公益类科研院所基本科研专项(No.2021R1010007);中央引导地方科技发展专项(No.2021L3017);福建省林业种苗科技攻关七期项目(No.ZMGG-0704)。

摘　　要：为探究短枝木麻黄半同胞家系苗期生长与分枝性状遗传变异规律,初步筛选优良种质,以40个短枝木麻黄半同胞家系1年生幼苗为材料,对其苗高、地径、干重、根冠比、侧枝数、侧枝角和侧枝长等7个性状进行遗传分析;通过聚类分析和布雷金多性状综合评价法,进行优良家系选择。结果表明,短枝木麻黄半同胞家系苗期生长与分枝性状变异丰富,7个性状在家系间差异均达到极显著水平;各性状家系遗传力变化范围为0.36~0.83,受中度或强度遗传控制。以10%入选率,选出4个优良家系,分别为3-265、5-373、1-266和2-343家系,入选家系苗高、地径、干重、侧枝数和侧枝长的现实增益分别为21.14%、19.10%、41.83%、19.97%和18.88%,遗传增益分别是17.55%、15.66%、29.70%、15.57%和15.10%,选择效果较为显著。短枝木麻黄幼苗在家系间具有很大的选育潜能,本研究选择出的优良家系既丰富了短枝木麻黄优良种质资源,也为后续短枝木麻黄遗传改良和林分营建提供了较好的种质材料。In order to explore the growth and branching genetic variation of Casuarina equisetifolia half-sib families at seedling stage,the annual seedlings of 40 half-sib C.equisetifolia families were used as the materials.Genetic analysis was carried out on seven traits:seedling height,ground diameter,dry weight,root shoot ratio,number of lateral branches,angle of lateral branch,and length of lateral branch.At the same time,cluster analysis and multi-trait com-prehensive evaluation method were used to select excellent families.The results showed that the growth and branching traits of C.equisetifolia half-sib families at seedling stage varied widely,and the differences of the seven traits among families reached extremely significant level.The family heritability of the growth and branching traits ranged from 0.36 to 0.83,which were controlled by moderate or strong inheritance.Four excellent families,3-265,5-373,1-266 and 2-343,were selected at a 10%selection rate.The real gains of seedling height,ground diameter,dry weight,number of lateral branches and length of lateral branches of the selected families was 21.14%,19.10%,41.83%,19.97%and 18.88%,respectively.The genetic gains were 17.55%,15.66%,29.70%,15.57%and 15.10%,respectively.The effect of selection work was remarkable. C. equisetifolia seedlings have great breeding potential among families. The excellent families selected in this study not only enrich the excellent germplasm resources of C. equisetifolia, but provide better germplasm materials for the subsequent genetic improvement and forest construction of C. equisetifolia.

关 键 词：短枝木麻黄 半同胞家系 遗传变异 苗期选择 

分 类 号：S722.5[农业科学—林木遗传育种]