文献类型：期刊文献

英文题名：Genetic variation and gains for two generations of Eucalyptus dunnii in China

作者：Shi, Tingyou[1] Arnold, Roger J.[2,3] Kang, Wenling[1] Duan, Fuwen[1] Qian, Yinxin[1] Xie, Hui[1] Xu, Jianmin[4]

第一作者：Shi, Tingyou

通信作者：Arnold, RJ[1];Arnold, RJ[2]

机构：[1]Forestry Res Inst Chuxiong Prefecture, Chuxiong 675005, Yunnan, Peoples R China;[2]Chinese Acad Forestry, China Eucalypt Res Ctr, 30 Renmin Dadao, Zhanjiang 524022, Guangdong, Peoples R China;[3]Univ Melbourne, Sch Ecosyst & Forest Sci, 500 Yarra Blvd, Richmond, Vic 3121, Australia;[4]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Guangdong, Peoples R China

年份：2016

卷号：79

期号：1

起止页码：15-24

外文期刊名：AUSTRALIAN FORESTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000370569600002)】；

基金：The establishment and early management of these trials was supported jointly by Asia Pacific Resources International Holdings China (Zhangzhou, Fujian) and Chuxiong Forest Research Institute. Partial support for data analyses and compilation of this article was provided by project 'Breeding high productivity and stress tolerant new varieties of Eucalyptus species' of the People's Republic of China's Ministry of Science and Technology 12th 5-year plan [project number 2012BAD01B0401].

语种：英文

外文关键词：planning; genetic variation; Eucalyptus dunnii; genetic improvement; China; seed orchards; Heritability; correlation

摘要：One hundred and forty-two Eucalyptus dunnii seedlots including 66 families and 1 bulk seedlot from natural stands, 52 families and 4 bulk seedlots from genetically-improved (first-generation) sources and 1 local plus-tree seedlot were established in trials in Yunnan, China, in 2007 and 2008. These were assessed for growth up at ages 61/2years and 51/2years, respectively. Significant differences (PP<0.01) among seed sources existed in both trials at most ages. The seedlot of local E. dunnii plus-trees proved to be markedly superior for volume over other sources, all of Australian origin, in both trials. On average, exotic improved seedlots outperformed unimproved natural stand seedlots, although in the 2008 trial, tree volume at an age of 51/2years of two natural stand seedlots exceeded that of some improved seedlots. Estimates of heritabilities for individual tree volume ranged from 0.09 +/- 0.07 up to 0.29 +/- 0.16 and genetic correlations between early age (11/2 to 21/2years) individual tree volume and that at final assessment (51/2 to 61/2years) ranged from 0.29 +/- 0.12 to 0.89 +/- 0.22. Heritabilities and correlations generally increased with age, but progressive within-plot thinning may have biased estimates of genetic parameters beyond the early assessments. The best seed orchard seedlot in each trial offered modest stem volume gains over natural stand seeds ranging from 11% to 13%. Markedly higher gain, an additional 25%, could be obtained by using seedlots of only the best seed orchard families. Genetic gains in tree volume estimated for future seed orchards developed from the trials ranged from around 8% up to 27%.