《Table 6 Analysis of variance components and genetic gains of growth characters from open-pollinated

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《Progeny Test on the Natural Populations and Selection of Excellent Populations from Fraxinus Mandshurica》

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Heritability and genetic gain are important genetic parameters for evaluating the genetic improvement of forest tree，and their sizes and relative stability are affected by genes and environment.In the mountainous areas of northeastern China，the natural distribution area of F.mandshurica has a continental monsoon climate.The complex and diverse ecological environment，cool and humid forest climate and moist fertile soil enhance the ecological adaptability and ecological coupling of the species.In order to investigate the genetic effects of open-pollinated individuals of F.mandshurica，the progenies of natural populations were used as the determining objects to perform targeted variance analysis to the quantitative traits，and the heritability and genetic gains of the open-pollinated individuals were estimated according to the variance analysis results（Table 6）.As shown in Table 6，for the progenies of natural populations of F.mandshurica，the heritability of the tree height and DBH was 0.825 and 0.781，respectively，and the genetic gains were 15.16%and 25.85%，respectively.The results fully showed that in the eastern mountainous areas of northeastern China，the quantitative traits of the progenies of natural populations of F.mandshurica were strongly controlled by genes，so they had strong heritability，small genetic differentiation，high genetic gains，and huge growth potential，making them available for advanced generation improvement breeding.Therefore，taking into account of the various factors of ecological adaptability，ecological coupling，stress resistance，genetic effects，heritability and genetic gain，SHT and XIL were determined to be excellent natural populations with the growth characters of open-pollinated progenies as the main evaluation indicators，which could be widely applied in the advanced generation improvement breeding.