摘要
【目的】研究尾叶桉Eucalyptus urophylla无性系的遗传变异,筛选适合阳江地区生长的优良无性系,为新品系选育及推广应用提供科学依据。【方法】以76份尾叶桉无性系为研究材料,在阳江地区分3次营建尾叶桉无性系测定林;造林后逐年测量其树高和胸径,并对该生长性状进行方差分析和遗传参数估算,采用多性状基因型值筛选优良无性系,并估算入选优良无性系的遗传增益。【结果】尾叶桉的树高和胸径在无性系间存在显著差异,且生长性状的变异系数逐年递减。除少数年份内的生长性状外,尾叶桉生长性状方差分量在区组间的差异达到了显著或极显著的水平,遗传方差分量介于0.10~22.61之间,环境方差分量介于0.18~45.86之间,重复力介于0.10~0.42之间。除1年生树高外,树高和胸径存在较强的遗传正相关,遗传和表型相关都达到中等及较高的水平(相关系数为0.40~0.98),且相同林龄内的树高和胸径间相关性较大。根据不同林龄预测的树高和胸径基因型值,结合树高和胸径的生长表现,在所有林龄的无性系中,无性系ZQUB29、ZQUA34、ZQUC33、ZQUA15和ZQUA33的表现都较好,表明这些无性系可能在整个轮伐期长势都较稳定,是优良无性系。【结论】参试尾叶桉无性系间生长差异极显著,入选的5个优良无性系可作为后续尾叶桉遗传改良和良种选育的基础。
【Objective】To study the genetic variation of Eucalyptus urophylla,select excellent clones suitable for growing in Yangjiang,and provide a scientific basis for selection and promotion of new clones.【Method】Totally 76 E.urophylla clones were used as materials,and the clonal test fields of E.urophylla were constructed in three times.After afforestation,tree height and diameter at breast height(DBH)were measured every year,and the phenotypic traits were analyzed by variance analysis and genetic parameter estimation.The multi-trait genotype value was used to screen excellent clones,and the genetic gain of excellent clones was also estimated.【Result】Tree height and DBH of E.urophylla had significant differences among clones,and the variation coefficient of growth traits decreased year by year.Except for the traits of a few years,the variance component of E.urophylla growth traits reached a significant or extremely significant level among blocks,with genetic variance components ranging from 0.10 to 22.61,environmental variance components ranging from 0.18 to 45.86,and repeatability ranging from 0.10 to 0.42,respectively.There was strong positive genetic correlation between tree height and DBH except for tree height of one-year-old tree.Both genetic and phenotypic correlations between tree height and DBH reached medium to high levels with the correlation coefficients ranging from 0.40 to 0.98.The correlations between tree height and DBH at the same tree age were large.Based on the predicted tree height and DBH genotype values at different ages with the growth performance,excellent clones of ZQUB29,ZQUA34,ZQUC33,ZQUA15 and ZQUA33 had higher growth genotype and phenotype values at all ages,indicating that these clones may be more stable throughout the rotation period and were excellent clones.【Conclusion】The growth differences among E.urophylla clones involved in the fields are extremely significant,and five excellent clones can be used as the basic materials for the subsequent genetic improvement of E.urop
作者
杨会肖
廖焕琴
杨晓慧
徐放
张卫华
陈新宇
潘文
YANG Huixiao;LIAO Huanqin;YANG Xiaohui;XU Fang;ZHANG Weihua;CHEN Xinyu;PAN Wen(Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization/Guangdong Academy of Forestry,Guangzhou 510520,China)
出处
《华南农业大学学报》
CAS
CSCD
北大核心
2021年第1期109-115,共7页
Journal of South China Agricultural University
基金
广东省林业科技创新项目(2016KJCX002,2019KJCX003)。
关键词
尾叶桉
方差分析
遗传参数
遗传增益
无性系
Eucalyptus urophylla
variance analysis
genetic parameter
genetic gain
clone
