文献类型：期刊文献

中文题名：尾叶桉与赤桉正反析因交配杂种F_1材性遗传参数的估算

英文题名：Genetic Parameters for Wood Properties in a Reciprocal Factorial Mating Design between Eucalyptus urophylla and E. camaldulensis

作者：朱映安[1,2] 徐建民[1] 李光友[1] 陆钊华[1] 胡杨[3] 杨雪艳[1] 宋佩宁[1] 郭文仲[1]

第一作者：朱映安

机构：[1]中国林业科学研究院热带林业研究所热带林业研究国家林业局重点实验室;[2]云南农业大学园林园艺学院;[3]广东省江门市新会林业科学研究所

年份：2018

卷号：31

期号：6

起止页码：121-129

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：国家"十三五"行业重大专项"桉树纸浆材定向培育技术研究"项目(2016YFD0600503);中央级公益性科研院所基本科研业务费专项资金"桉树速生抗风;耐寒优良品种选育研究(CAFYBB2017ZA001-5)"

语种：中文

中文关键词：尾叶桉×赤桉;正反析因交配;材质性状;杂种优势;遗传参数

外文关键词：Eucalyptus urophylla×E.camaldulensis;reciprocal factorial mating;wood property;heterosis;genetic parameters

分类号：S718.46

摘要：[目的]通过尾叶桉与赤桉杂种F1材质性状的遗传参数估算及其分析,为桉树杂交育种材性改良亲本选配和交配设计提供理论依据。[方法]以尾叶桉与赤桉6×6正反析因交配杂种F1测定林为材料,并以相应亲本自由授粉的半同胞子代作对照。9年生时,对各小区的杂种和家系(5株小区,6次重复)选取2株平均木,在胸高1. 3 m处沿南北向钻取木芯,共984个,测定木材基本密度、纤维长、纤维宽和纤维长宽比,利用ASReml-R估算4个材质指标的特殊配合力、杂种优势、父母本单株狭义遗传力、遗传相关和表型相关系数。[结果]表明:尾叶桉与赤桉正反交的杂种木材基本密度优于对照,呈明显的杂种优势;反交组合杂种其木材基本密度优于正交组合杂种,正交组合杂种的纤维特性优于反交组合的;在正交组合杂种中,木材基本密度、纤维长和纤维长宽比的母本效应低于父本效应;而反交组合杂种中,4个材质指标的母本效应均高于父本效应。木材基本密度和纤维特性指标受中至低遗传控制。正反交组合杂种中,除纤维长宽比外,其余3个材质指标的显性效应大于加性效应。对于遗传相关,杂种的木材基本密度与纤维宽呈极显著的负相关,与纤维长宽比呈极显著的正相关,与纤维长呈不显著负相关,纤维长与纤维宽呈显著正相关。对于表型相关,除纤维宽与纤维长宽比呈不显著正相关外,其余性状间均呈极显著正相关。[结论]尾叶桉与赤桉杂种的材质性状遗传差异因亲本和交配方式而异,表明通过种间杂交和正向选择进行材质性状的遗传改良具有潜力。
[Objective]To estimate the genetic parameters for wood properties of Eucalyptus urophylla(U)and E.camaldulensis(C)F 1 hybrids and provide a theoretical basis for the selection of parental genotypes and mating design for the improvement on wood properties of eucalypts.[Method]A trial involving 36 reciprocal crosses from six C parents and six U parents preselected for superior growth and stem straightness was built.Ten open-pollinated(OP)half-sib families using the hybrid parents as females were included as the controls.The wood basic density(BD),fibre length(FL),fibre width(FW)and FL/FW at age 9 were assessed with 2 average stand trees from every 5 tree plot,984 wood cores were drilled for 82 combinations with 6 repeatations,at the height of 1.3 meters along the north to south.Specific combining ability,heterosis,single tree’s narrow-sense heritability(h 2)for female and male,genetic and phenotypic correlation coefficient were estimated for four wood property traits by ASReml-R.[Result]Inter-specific hybrids generally performed better than the OP progenies in terms of BD,which showed a significant heterosis.Female C by male U crosses(C×U)generally outperformed those involving female U by male C(U×C)in terms of BD,whilst,U×C crosses generally outperformed those C×U in terms of FL,FW and FL/FW.The maternal effects of wood basic density,fibre length and FL/FW were lower than paternal effects in U×C crosses,whilst the maternal effects of four wood properties were higher than paternal effects in C×U crosses.The h 2 estimates based on general hybridizing ability for BD and fibre traits were generally middle to low.Except for FL/FW,the dominance variance of all the other three wood properties were larger than additive variance.The ratio of hybrid dominance to additive variance(σ2 D/σ2 A)were larger than 1 for BD,FL and FW.The trait-trait genetic correlations amongst hybrids were significant and negative between BD and FW,significant and positive between BD and FL/FW,whilst,not significant and negative between BD and FL,and significant and positive between FL and FW.However,The trait-trait phenotypic correlations between wood properties were significant and positive except that between FW and FL/FW.[Conclusion]Genetic parameters of U and C hybrids in terms of wood properties are different from parental genotypes and mating direction,and inter-specific hybrid breeding and forward reciprocal selection is feasible for the improvement of wood properties.