摘要
【目的】测定尾叶桉与巨桉杂种F 1多年度的生长性状,估算其遗传参数,开展优良杂交组合及杂种优良单株选择,为桉树亲本选配和杂种应用提供科学依据。【方法】以尾叶桉与巨桉6×6析因交配F 1代杂种为材料,应用ASReml-R软件估算1、2、4.5、8.3和10.3年生时生长性状的遗传力、显性效应、加性效应、亲本效应和配合力等遗传参数;计算每个杂交组合单株材积的平均值,以所有组合的平均值+标准差为标准进行优良杂交组合选择;基于所有单株的材积,采用平均值+2倍标准差(标准Ⅰ)和平均值+3倍标准差(标准Ⅱ)2个标准进行杂种优良单株选择。【结果】尾巨桉F 1代杂种在各年龄时的生长表现均优于对照尾叶桉亲本自由授粉子代。每个年份树高、胸径和单株材积在组合间均存在极显著( P <0.01)或显著( P <0.05)差异,在区组间差异不显著。1年生和2年生时杂种各生长性状的母本加性方差分量低于父本加性方差分量, 4.5年生时父、母本加性方差分量较为接近,8.3和10.3年生时母本加性方差分量则高于父本加性方差分量。随年龄的增长,杂种的树高和胸径单株遗传力呈现由中度至低度遗传控制的变化趋势,杂种家系遗传力呈现高—中—低度遗传控制的趋势,且杂种家系遗传力大于单株遗传力。显性方差与加性方差的比值则随年龄的增长呈递增趋势。年-年和性状-性状双变量遗传、表型呈显著或极显著正相关。4.5年生时,母本U21及父本G8的一般杂交力(GHA)最高,U21×G5组合的特殊杂交力(SHA)最高;8.3年生时,母本U21及父本G19的GHA最高,U2×G19的SHA最高。【结论】尾巨桉F 1杂种1~2年生时父本效应大于母本效应,且加性效应大于显性效应,4.5年生时父、母本效应对杂种生长的贡献率相当,8.3~10.3年生时杂种的母本效应大于父本效应,且显性效应大于加性效应。同时评选出7个优良杂种,筛选出
【Objective】 Multiple-year growth traits of Eucalyptus urophylla × E. grandis F 1 hybrids were investigated, their genetic parameters were estimated, and superior hybrids and plus trees were selected aiming to provide a scientific basis for selection of mating parents and their hybrids.【Method】 The F 1 hybrids of E. urophylla×E. grandis from factorial mating system were studied using the open-pollinated progenies of E. urophylla as controls. ASReml-R software was applied to assess heritability, dominance effect,additive effect, parental effect and combining abilities of growth traits when 1, 2, 4.5, 8.3 and 10.3 years old. Mean single-tree volume was calculated for each hybrid combination, and superior combinations were determined as those with volume above mean+standard deviation of all combinations. Selection of plus trees was conducted with two standards, I: mean + two times standard deviation, and II: mean + three times standard deviation.【Result】 Growth performance of hybrids was obviously better than that of open-pollinated maternal off-springs at each age. Tree height, diameter at breast height (DBH) and individual volume at each age were significantly ( P <0.05 or P <0.01) different among hybrid combinations, while no significant difference was observed among blocks. Maternal variance component of each growth trait was lower than paternal variance component when one or two years old, they were equivalent to each other when 4.5 years old, while maternal variance component was higher than paternal variance component when 8.3 or 10.3 years old. With age increase, single-tree heritability ( h 2) generally tended to vary from middle to low, family heritability ( h 2 F) from high to middle to low, while additive-to-dominance variance ratio (σ 2 D/σ 2 A) increased for tree height and DBH. Year-year and trait-trait genetic and phenotypic correlations were significant among hybrids. The general hybridizing abilities (GHA) of U21 and G8 were the highest among maternal and paternal parents, respective
作者
沈乐
徐建民
李光友
陆钊华
杨雪艳
朱映安
胡杨
宋佩宁
郭文仲
Shen Le;Xu Jianmin;Li Guangyou;Lu Zhaohua;Yang Xueyan;Zhu Ying’an;Hu Yang;Song Peining;Guo Wenzhong(Key Laboratory of National Forestry and Grassland Administration on Tropical Forestry Research Research Institute of Tropical Forestry,Chinese Academy of Forestry Guangzhou 510520;Xinhui Forestry Research Institute, Guangdong Province Jiangmen 529100)
出处
《林业科学》
EI
CAS
CSCD
北大核心
2019年第7期68-76,共9页
Scientia Silvae Sinicae
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)
中国林业科学研究院基本科研业务费专项“桉树速生抗风、耐寒优良品种选育研究”(CAFYBB2017ZA001-5)
“热带及南亚热带人工林树种良种选育研究”(CAFYBB2018SZ002)
关键词
尾叶桉×巨桉
析因交配
遗传参数
亲本选配
生长性状
Eucalyptus urophylla×E.grandis
factorial mating design
genetic parameters
parental selection
growth traits
