江西毛红椿种源的半同胞家系子代早期测定及其评价

以江西4个种源14个家系的2年生毛红椿半同胞子代测定林为研究对象,采用R型因子法和多目标局势决策法进行性状评定和筛选。结果表明,不同种源和家系的胸径、树高、高径比、冠幅、冠径比、枝下高、分枝数与抗病虫害、抗寒性指数等均存在显著差异,它们的遗传变异系数为1.75%～52.73%;种源和家系的性状指标遗传力分别在0.21～0.86和0.29～0.75之间;以胸径、冠幅、枝下高、分枝数和抗性指标为主要指标进行综合选择,筛选出优良家系4个(1、2、5、9号),均系官山自然保护区种源。

Early selection and evaluation of half-sib progenies of Toona ciliata var pubescen from Jiangxi provenances

Fourteen progenies of 2 year-old half-sib Toona ciliata var pubescen derived from 4 provenances in Jiangxi province were used to evaluate their traits and selected by R-factor method and decision making of multi-objective situation.The results showed that significant differences in both the different provenances and families were observed in their traits of diameter,height,height to diameter ratio,crown width,crown diameter ratio,under crown height,number of branches and pest resistance,cold resistance index,whose genetic variation coefficients were at 1.75%–52.73%,and their provenance and family heritability were at 0.21-0.86,0.29-0.75,respectively.Based on combination of the main indexes of diameter,crown width,under crown height,number of branches and resistance index,4 superior families named No.1,2,5,9,which all derived from Guanshan Moun-tain Natural Reserve,were screened out.