榧树半同胞子代幼苗生长性状的遗传参数估算  

Estimation of genetic parameters for juvenile growth of half-sib seedlings of Torreya grandis

作　　者：叶淑媛 董雷鸣[1,3] 董昂[1] 喻卫武 戴文圣[1] 曾燕如[1] YE Shuyuan;DONG Leiming;DONG Ang;YU Weiwu;DAI Wensheng;ZENG Yanru(State Key Laboratory of Subtropical Silviculture,Zhejiang A&F University,Hangzhou 311300,Zhejiang,China;Research Institute of Subtropical Forestry,Chinese Academy of Forestry,Hangzhou 311400,Zhejiang,China;Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,China)

机构地区：[1]浙江农林大学,省部共建亚热带森林培育国家重点实验室,浙江杭州311300 [2]中国林业科学研究院,亚热带林业研究所,浙江杭州311400 [3]中国林业科学研究院,林业研究所,北京100091

出　　处：《浙江农林大学学报》2020年第4期817-822,共6页Journal of Zhejiang A&F University

基　　金：浙江农林大学省部共建亚热带森林培育国家重点实验室项目(ZY20180208);浙江省科技厅重点研发项目(2018C02004)。

摘　　要：【目的】研究生产上香榧Torreya grandis ‘Merrillii’嫁接繁殖砧木用榧树T. grandis幼苗生长性状的遗传,选育天然优良榧树种质。【方法】以天然林自由授粉的榧树半同胞子代为材料,连续2 a测定榧树幼苗苗高、地径及分枝数,采用常规线性混合模型(LMM)和广义线性混合模型(GLMM)拟合并估算相关的遗传参数,计算了遗传和表型相关系数。【结果】总体上榧树幼苗苗高的变异系数大于地径的变异系数,且随幼苗年龄的增加而降低。各生长性状指标在家系间均存在极显著差异(P<0.01),且遗传力都较高,1年生幼苗各指标的遗传力均大于2年生幼苗的遗传力,遗传相关大于表型相关。遗传增益方面则表现为幼苗苗高大于地径及分枝数,以1年生枝条的遗传增益最高。生长表型性状相关分析表明:同批榧树幼苗除分枝数外,各指标间的遗传及表型均有极显著的相关性。【结论】天然群体榧树在生长性状上具有较强的选育潜力,可以根据1年生幼苗的苗高来选择培育砧木的采种树。表3参24。[Objective]To provide rationale for the selection and breeding of natural superior individuals of Torreya grandis,this research is intended to study the inheritance of the growth traits of T.grandis seedlings which are generally used as the rootstock for grafting scions from T.grandis‘Merrillii’in production.[Method]With half-sib seedlings of T.grandis openly pollinated in the natural forests as a material,the height,basal diameter and number of branches were measured for two consecutive years while the relevant genetic parameters were fitted and estimated employing conventional linear mixed model(LMM)and generalized linear mixed model(GLMM)so as to calculate the genetic and phenotypic correlation coefficients.[Result]The coefficient of variation of seedling height was greater than that of basal diameter and decreased with the seedling age.Every growth trait parameter displayed a very significant difference among families(P<0.01)and a relatively high heritability.The heritability of one-year-old seedlings for each parameter was higher than that of two-year-old seedlings and the genetic correlation was greater than that of phenotypic correlation.In terms of genetic gain,the seedling height was bigger than the basal diameter and the number of branches,and the genetic gain of the annual shoot was the highest.The correlation analysis of growth phenotypic traits showed that there was a significant correlation between genotype and phenotype of the same batch seedlings in all the parameters except the number of branches.[Conclusion]Natural T.grandis populations have displayed the great potential for selection and breeding in growth traits.Seed-bearing trees could be selected based on the height of one-yearold seedlings for the purpose of stock cultivation.[Ch,3 tab.24 ref.]

关 键 词：经济林学 榧树 香榧 砧木 遗传参数 选育 线性混合模型 

分 类 号：S664.5[农业科学—果树学]