摘要
[目的]通过对尾巨桉杂种F1抗风性状分析及选优,为今后桉树抗风良种选育提供依据和奠定基础。[方法]对36个尾叶桉×巨桉杂种F1代的抗风值、生长性状、形质性状和材质性状进行遗传相关性分析,并根据育种目标分别采用独立淘汰法与主成分分析进行选优。[结果]尾叶桉×巨桉杂种的抗风性优于母本对照;抗风值、生长性状和形质性状以及材质性状中的纤维宽在杂种组合间均呈显著或极显著差异,在区组间均差异不显著。单株材积与材质性状均呈不显著遗传相关,与木材基本密度、纤维宽、纤维长宽比以及木质素含量间呈显著或极显著表型正相关;杂种抗风值与生长性状呈不显著遗传负相关及呈极显著表型负相关;抗风值与纤维长、纤维宽呈显著遗传负相关,与其他材质性状呈不显著遗传相关,抗风值与纤维长、纤维宽、纤维长宽比呈显著或极显著表型负相关,与半纤维素含量呈显著表型正相关。[结论]尾巨桉杂种的抗风性优于尾叶桉母本,且杂种的抗风值与纤维长、纤维宽呈显著遗传负相关;采用独立淘汰法选出3个优良抗风杂种组合,采用主成分分析法选出7个生长、材质、形质且抗风兼优的杂种。
[Objective] To analyze the wind resistance and select the F1 hybrids of Eucalyptus urophylla×E. grandis,in order to provide the references for eucalyptus’ s breeding the improved wind-resistant varieties. [Method] Genetic and phenotypic correlation among growth traits, wood traits and wind-resistant of the F1 hybrids from E.urophylla×E. grandis were analyzed. And independent culling and principal component analysis were used to select the best hybrid according to the breeding objective. [Result] The wind resistance performance of the hybrids selected was obviously better than that of the control. The wind resistance value, growth traits, form traits and fiber width of wood traits exhibited significant differences(p<0.05) or extremely significant differences(p<0.01) among cross combinations, and showed no essential differences among blocks. The trait-trait genetic correlations between individual volume and wood traits were not significant. The trait-trait phenotypic correlations between individual volume and basic density, fiber width(FW),ratio of fiber length to fiber width(FL/FW) and lignin were significantly negative. The trait-trait genetic correlations between wind resistance value and growth traits were not significant. The traittrait phenotypic correlations between wind resistance value and growth traits were significantly positive or extremely significantly positive. The genetic correlations were significantly negative between wind resistance and fiber length(FL), FW. The genetic correlations were not significant between wind resistance and remainder wood traits. The phenotypic correlations were significantly negative between wind resistance and FL, FW, FL/FW, and were significantly positive between wind resistance and hemicellulose, but were not significantly positive between wind resistance and basic density, cellulose, lignin. [Conclusion] The wind resistance performance of hybrids is obviously better than E. urophylla parents. The genetic correlations are significantly negative between wind resistance and FL, FW.Three hybrid combinations are selected by using independent culling and comprehensive index methods. And a total of 7 superior cross combinations, which are superior in growth, quality together with morphology, are determined according to principal component analysis.
作者
沈乐
徐建民
李光友
胡杨
伍世杰
梁国坚
白惠文
SHEN Le;XU Jian-min;LI Guang-you;HU Yang;WU Shi-jie;LIANG Guo-jian;BAI Hui-wen(Research Institute of Tropical Forestry,Chinese Academy of Forestry,Tropical Forestry Research National Forestry Administration Key Laboratory of National Forestry and Grassland Administration,Guangzhou 510520,Guangdong,China)
出处
《林业科学研究》
CSCD
北大核心
2020年第5期13-20,共8页
Forest Research
基金
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
抗风值
生长性状
材质性状
形质性状
主成分分析
Eucalyptus urophylla×E.grandis
wind-resistance value
growth traits
wood traits
form quality characters
principal component analysis
