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A variation and selection of growth and wood traits for 10-year-old Schima superba
WANG Yunpeng, ZHANG Rui, ZHOU Zhichun, HUA Bin, HUANG Shaohua, MA Lizhen, FAN Huihua
JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (5) : 85-92.
PDF(1572 KB)
PDF(1572 KB)
A variation and selection of growth and wood traits for 10-year-old Schima superba
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【Objective】 To analyze the genetic variation and correlation of growth and wood traits in 10-year-old Schima superba open-pollinated families and select families with excellent growth and wood traits that can provide quality material for high-generation breeding and improvement of S. superba. 【Method】The 113 open-pollinated families of S. superba plus trees established in Jian’ou of Fujian Province in 2008 were used as experimental materials. Genetic variation, genetic parameter estimation and the correlation analysis were carried out on tree height, diameter at breast height (DBH) and basic wood density. On this basis, families with high-quality growth and wood traits were selected. 【Result】 The tree height, DBH and basic wood density of the 10-year-old S. superba open-pollinated families showed significant differences among families. The basic wood density was greatly affected by genetic effects, while tree height and DBH were affected by genetic and environmental effects in addition to the genetic control. The differences in tree height and DBH between producing areas were highly significant, while the differences in basic wood density were not significant. The phenotype variation coefficient and genetic variation coefficient were followed by DBH (12.13%, 7.74%), tree height (8.28%, 3.58%), and basic wood density (2.82%, 1.92%), indicating a large variation between families in DBH and a small variation in basic wood density. The results of heritability estimation showed that the family heritability and the individual heritability were in the order of basic wood density (0.48, 0.42), DBH (0.44, 0.35) and tree height (0.32, 0.26), which were subject to moderate to strong genetic control. Phenotypic and genetic correlation results showed that there was a very significant positive correlation between tree height and DBH, while there was no correlation between growth traits and basic wood density. Therefore, growth traits and basic wood density could be independently selected. Thirteen families with excellent growth and wood traits were selected with the criteria of higher than 10% of the mean DBH and the average basic wood density. The average genetic gains of DBH and basic wood density were 6.99% and 1.18%, respectively, and the average real gains were 16.08% and 2.42%, respectively. 【Conclusion】 The tree height and DBH were affected by genetic and environmental interactions in addition to the genetic control, while the basic wood density was greatly affected by genetic effects. The DBH had strong variability, and the basic wood density was strongly controlled by genetics. Growth traits and basic wood density could be selected independently. Thirteen families with excellent growth and wood traits were selected.
Schima superba / growth trait / basic wood density / genetic variation / family selection
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