Genetic Variation And Synthetic Selection Testing Of Cunninghamia Lanceolata

Variation of growth traits and wood properties, genetic control and correlation between traits were studied systematically on 240 progenies of open-pollinated families of Cunninghamia lanceolata from a 2^nd-generation seed orchard. The main results were as follows:1. Genetic variation of growth traits. The variance analysis shown that there were very significant differences among families tested. The genetic differences on the characteristics, such as 20-year-old tree height, DBH and Volume, were shown very significant level statistically.2. Genetic variation of three wood properties traits. There is no significant genetic variation on microfibril angle, but, there were significant or very significant genetic variation on wood basic density and red heartwood rate among families tested.3. Correlation between traits. A very high positive phenotype and genetic relationship was to be found among height, DBH and volume, The negative phenotypic and genetic correlation coefficient found between Height, DBH, and volume with the wood basic density. The genetic correlation found between the wood basic density and volume. The genetic and phenotypic relationship between red heart rate and growth traits is positive, and significant.4. There were 121 families performance above the total average according to their breeding value evaluation. In addition, there were 34 families selected out of the 121 families based on the family breeding value, which exceeded the 10% of overall average. which based on using three characteristics with tree volume, wood basic density and microfibril angle, was: I=35.09X₁+86.66X₂+1.0385X₃; According to a comprehensive selection index unconstrained and constrained the basic wood density (wood basic density is above the average), 24 superior families were selected.