山地木麻黄家系遗传参数估算与家系选择  

Estimation of Genetic Parameters and Screening of Families for Casuarina junghuhniana

作　　者：仲崇禄[1] 白嘉雨[1] 

机构地区：[1]中国林业科学研究院热带林业研究所

出　　处：《林业科学研究》1998年第4期361-369,共9页Forest Research

基　　金：中澳合作项目

摘　　要：含３１个山地木麻黄家系的子代测定试验林营建于广东省阳西县。造林后定期观测树高和胸径。５年生时，对参试家系的１２个性状进行了方差分析、协方差分析、相关分析，估算了遗传参数与综合选择指数。结果表明造林后５个月至６０个月间早晚期树高及１２个月至６０个月间早晚期胸径有极显著相关；１２个生长性状和质量性状在家系间均有极显著差异；树高、胸径、单株材积、枝下高和冠幅的遗传变异系数分别高达３５．５６％、３３．４４％、９３．０２％、３０．９１％和２２．５３％，质量性状的遗传变异系数在３．９５％～１６．０２％；分析了１２个性状的遗传相关系数和表型相关系数，探讨了性状间的相关关系；各性状的家系遗传力较高，除保存率的家系遗传力为０．５５外，其它性状的家系遗传力为０．８０～０．９４。在入选率为２０％时，树高、胸径和单材的遗传增益分别可达２４．０３％、２２．３８％和６０．９０％，主干通直度、侧枝密度和保存率、主干分叉习性和树木健康状况的遗传增益为６．８５％～１５．１７％；比较了几种家系评选方法，最后选出了一些优良家系。A progeny test trial with 31 families of Casuarina junghuhniana was established at Yangxi of Guangdong. After planting,tree heights were measured for 6 times and DBH was for 5 times. Based on 12 quantity or quality traits of the 31 families,analysis of variance,covariance,correlation,variance component were carried out to estimate genetic variation coefficient ( Gcv ),family heritability( h 2 f ),early-late correlation of tree height( H ) and DBH ,phenotypic and genetic correlation and genetic gain. Results showed that there are significant correlation in heights from the 5 months to 5 years and DBH from 1 year to 5 years after planting. There were significant differences in 12 trait values between families. Genetic variation coefficients of tree height, DBH ,single tree volume( V ),pole height( Hs ) and crown width( Cm ) were respectively 35.56%、33.44%、93.02%、30.91% and 22.53%,other trait values were 3.95%～16.02%. Analysed the phenotypic and genetic correlation of 13 trait values. Calculated the heritablities for 12 traits,except survival percentage heritability was 0.55,the other 11 traits of heritabilites were 0.80～0.94. When selection portorption was 20%,genetic gains of main growth traits in H,DBH and V were respectively 24.03%,22.38% and 60.90%,and genetic gains of main quality traits in stem straightness,permanent branch density,survival percentage,stem persistence and tree health level were 6.85%～15.17%. Finally,using breeding values and selection indexes,evaluating the 31 families of performance and found out some dominant families.

关 键 词：山地 木麻黄 家系选择 遗传参数 

分 类 号：S792.930.1[农业科学—林木遗传育种]