Abstract:
Objective The purpose of this research is to study the differences and genetic characteristics of various timber traits among Section Aigeiros clones, and to evaluate the excellent degree of wood properties of the clones, so as to provide theoretical basis for breeding clones with excellent comprehensive characters in experimental areas, and promote the directional cultivation of industrial timber.
Method The wood properties (anatomical features, physical properties, and chemical composition) of ten-year-old sample trees (5 plants per clone) were measured from 8 experimental Section Aigeiros clones in Jiaozuo, He'nan Province. The genetic variation and genetic parameters of 18 wood traits were analyzed, and principal component analysis was used to evaluate the clones.
Result Except the hemicellulose, the other 17 wood properties of poplar clones showed significant differences among clones. The variation range of clone repeatability was 0.49-0.93, in which the absolutely dried density, basic density, total cellulose, radial cell diameter and radial lumen diameter were more than 0.8. The phenotypic variation of clones was greater than the genetic variation. Populus × euramericana 'Zhonglin 46' was selected as the superior clones based on the highest core of principal component factors.
Conclusion The eight poplar clones showed genetic differences in 18 wood properties, which were under strong genetic control and possessed the conditions of genetic improvement. There were radial differences in clone repeatability. With the increase of annual rings, the variation range of physical properties was the smallest, and the absolutely dried density and basic density were relatively stable.
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