香椿无性系苗期生长及早期选择研究
Study on growth traits of different Toona sinensis clones and superior clone early selection
投稿时间:2019-01-04  修订日期:2019-03-26
DOI:
中文关键词:  香椿  无性系选择  表型生长  遗传参数  早期选择
英文关键词:Toona sinensis  clone selection  phenotypic growth  genetic parameter  early selection
基金项目:“十三五”国家重点研发计划课题“红锥、椿木等高效培育技术研究”(2016YFD0600606)
作者单位E-mail
胡继文 中国林业科学研究院 hujiwen020@126.com 
麻文俊 中国林业科学研究院林业研究所  
沈元勤 南阳市林业科学研究院  
肖遥 中国林业科学研究院  
翟文继 南阳市林业科学研究院  
王军辉 中国林业科学研究院  
杨桂娟 中国林业科学研究院 yangguijuan123@163.com 
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中文摘要:
      摘要:[目的] 对香椿无性系的苗期生长进行分析,为筛选优良香椿无性系,奠定遗传改良的基础,。[方法]以49个香椿无性系为对象,分别于2015、2016、2017年测量其1 a、2 a、3 a生株高、胸径,计算材积,对表型性状及其增长量进行方差分析和遗传参数估算,采用独立淘汰法筛选排名前20%的无性系为优良,对中选无性系进行遗传增益等参数估算,并将试验地不同年份特征气象因子与无性系表型性状进行相关分析。[结果]香椿无性系株高、胸径及材积的生长在连续3 a无性系间存在显著差异,且该3 a生长性状的遗传变异系数、表型变异系数逐年减小,而变异幅度、重复力逐年增大;3 a生时,株高、胸径及材积的无性系重复力分别为0.55、0.50、0.67,重复力高。2015~2017年,49个香椿无性系之间胸径、材积增长量分别呈显著、极显著差异,3 a生材积与材积、胸径增长量呈高度正相关关系。以3 a生香椿无性系材积及其增长量为2组指标,独立筛选出优良无性系10个,中选无性系群体平均材积大于0.010 4 m3,增长量大于0.009 7 m3。3 a生材积的遗传增益为17.38%,中选香椿无性系的b值均大于1,对年份环境敏感。气象因子——表型性状相关性分析显示,材积与年总降水量、日均降水量有显著正相关关系。[结论]参试香椿无性系间材积差异极显著,选择潜力大;中选的优良香椿无性系遗传增益超过15%,但其在不同年份差异大且稳定性差,这可能与年份降水量有关。
英文摘要:
      Abstract: [Objective] In oder to screening for superior clones for establishing the foundation of the genetic improvement of Toona sinensis, the grafting seedling growth of 49 T. sinensis were evaluated. [Method] The plant height and DBH of 1a, 2a, and 3a of 49 T. sinensis clones were measured in 2015, 2016, 2017, respectively. The volume was calculated. Variance analysis and genetic parameter estimation were carried out for phenotypic characters and their growth. The top 20% of the clones were selected by independent elimination method. The genetic gains of the selected clones were estimated, and the correlation between characteristic meteorological factors and the phenotypic traits of the tested clones were analyzed. [Result] There were significant differences in the height, DBH and volume of T. sinensis clones in the continuous 3 years. The genetic variation coefficient and phenotypic variation coefficient of the 3 growth traits showed a decreasing trend yearly, while the variation range and the repeatability(R) increased yearly. The height, DBH and volume Rs of T. sinensis clones reached a highest point, which was 0.55, 0.50, 0.67, respectively. 2015~2017 a, the DBH and volume growth showed significant and highly significant difference among different clones. According to the volume of 3 a clones and their growth, 10 superior clones were screened out. The average volume of the selected clones was greater than 0.010 4 m3, and the growth was greater than 0.009 7 m3. The genetic gain of the 3 a biomass is 17.38%. And the b value of the selected clones was greater than 1, which showed that the selected clones were sensitive to the annual environment. The correlation analysis of meteorological factors-phenotypic traits showed that the volume had a significant positive correlation with total annual precipitation and average daily precipitation. [Conclusion] The difference in volume between the tested clones was extremely significant, which demonstrates a large selection potential. The genetic gain of the selected clones was high, but it was different in different years and the stability was poor, which might be related to the annual precipitation.
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