陈小中,张临萍,陈炙,刘欢欢,黄振,李佳蔓,杨汉波
CHEN Xiaozhong,ZHANG Linpin,CHEN Zhi,LIU Huanhuan,HUANG Zhen,LI Jiaman,YANG Hanbo

• 1:四川省林业工作站
• 2:四川省林业和草原调查规划院
• 3:四川省林业科学研究院
• 4:四川农业大学林学院生态林业研究所

摘要(Abstract)：

调查了大花序桉家系生长(苗高、地径)性状,为大花序桉苗期遗传变异与选择提供理论依据。以1年生大花序桉为材料进行苗高和地径的遗传变异分析、方差分析、遗传参数估算,利用隶属函数法综合选择优良家系。大花序桉苗高和地径在家系间差异极显著,其重复力为0.895和0.985。苗高和地径变异系数分别为44.01%和65.96%。苗高家系遗传力和单株遗传力分别为0.894和1.605,地径家系遗传力和单株遗传力分别为0.985和2.935。相关性分析结果表明,苗高和地径呈负相关,但不显著。一般配合力分析结果表明,苗高和地径一般配合力高的家系差异较大,难以进行联合筛选,需进一步分析。大花序桉家系幼苗生长性状存在丰富的遗传变异,且受到较强的遗传控制,有较好的遗传改良潜力。大花序桉幼苗苗高和地径具有独立性,可进行单独定向选择。针对育种目标,利用隶属函数法最终选择出5个优良家系(39、19、38、25和13),其中家系39和19地径增益巨大,分别为254.47%和123.59%,可作为优良亲本选择或定向培育材料。
In order to provide theoretical basis for genetic variation and selection of Eucalyptus cloeziana F. Muell.families at seedling stage, the growth(tree height and diameter at ground) of E. cloeziana families were investigated.One-year-old E. cloeziana was used to carry out genetic variation, variance, and genetic parameters estimation of seedling height and ground diameter, and superior families were comprehensively selected by the membership function method. The height and diameter at ground of E. cloeziana were significantly different among the families, and the repeatability was between 0.895 and 0.985. The coefficient of variation of height and diameter at ground were 44.01%and 65.96%, respectively. The family heredity and single heredity of height were 0.894 and 1.605, and the family and single heredity of diameter at ground were 0.985 and 2.935, respectively. Correlation analysis results showed that seedling height and ground diameter were negatively correlated, but not significant. The results of general combining ability analysis showed that the families with high general combining ability of different traits had great differences,which was difficult to carry out combined screening and further analysis was needed. There were abundant genetic variations in seedling growth traits of E. cloeziana families, which were under strong genetic control and had good genetic improvement potential. The height and ground diameter of E. cloeziana families were independent and could be individually oriented. Five optimal families(39, 19, 38, 25, and 13) were selected through the membership function method. Family 39 and 19 had extremely high genetic gain of ground diameter, and they could be used as excellent parents and(or) directive breeding materials.

关键词(KeyWords)： 大花序桉;家系;苗期;遗传变异;选择
Eucalyputs cloeziana F. Muell.;Family;Seedling;Genetic variation;Selection

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目(2016YFD600501)

作者(Author): 陈小中,张临萍,陈炙,刘欢欢,黄振,李佳蔓,杨汉波
CHEN Xiaozhong,ZHANG Linpin,CHEN Zhi,LIU Huanhuan,HUANG Zhen,LI Jiaman,YANG Hanbo

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