摘要
开展林木优良无性系选择,充分利用基因的加性效应和非加性效应,以获得最大遗传增益和经济效益为良种的选育目标。本研究针对白桦优良杂种子代的优良个体,通过组培扩繁技术建立了37个无性系,连续2个年度测定其苗高、地径、侧枝数、叶面积及节间距等性状,并进行差异显著性分析,利用隶属函数法结合主成分分析赋予各性状权重值,对各无性系进行综合评价。结果表明:无性系间的苗高、地径、侧枝数、叶面积及节间距等性状差异均达到极显著水平(P<0.01);相关分析发现,凡是高生长量大的无性系,其地径粗、侧枝数量多、节间距长,但平均单个叶面积较小。根据2个年度隶属函数值的均值,将无性系划分为1、2、3、4级4个等级,其中有7个无性系被确定为1级,这些无性系苗高、地径、侧枝数的均值较整个群体均值分别提高了11.31%、9.91%、8.93%;被评为2级的无性系有13个,可作为增加白桦遗传多样性候选对象。
The goals of this study were to select superior clones of pot culture Betula platyphylla,and to achieve maximum genetic gains and economic benefits based on gene additive and non-additive effects. A total of 37 birch clones obtained through tissue culture techniques were used to study height,ground diameter,number of lateral branches,leaf area and internode length for two years and significance analysis of their difference. Finally,using the methods of membership function in fuzzy mathematics and principal component analysis,we provided weight value of each character and comprehensive evaluation of the clones. The results showed that there were significant differences( P〈 0. 01) in each of five traits( height,ground diameter,number of lateral branches,leaf area and internode length). The correlation analysis indicated that the height was positively correlated with the ground diameter,lateral branch number and internode length,but negatively correlated with the leaf area. According to the average of the two-years membership function value,the clones were classified into four grades: grade 1,grade 2,grade3,grade 4. Seven clones were identified as grade 1,of which the height,ground diameter and number of lateral branches were 11. 31%,9. 91% and 8. 93% higher than average,respectively; while 13 clones were classified as grade 2,and these may be used as candidates to increase genetic diversity.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2017年第2期16-23,共8页
Journal of Beijing Forestry University
基金
林业公益性行业科研专项(201204302)
关键词
白桦
无性系
苗期选择
Betula platyphylla
clone
seedling selection