Abstract:

In order to understand the genetic variation and study the genetics background of the Populus nigra. The genetic diversity was studied by structure 2.2 software and coefficient analyzing growth of 104 Populus nigra genotype. The results showed that in genetic parameter estimation, trait heritability was higher than 0.65, and genetic gain of volume were higher than 25.49%. According to path analysis, there were positively direct path coefficients for ground diameter under nitrogen fertilization and volume under non-fertilization to response index to nitrogen, and others the opposite. The characteristics of germplasm sources of Populus nigra population were pluralism and heterogeneity, all genotype were divided into 7 groups, the group 2 and the group 3 were main group. Combined with geographic origin and nitrogen use efficiency evaluation of Populus nigra, central Europe and southern Europe were origin center of population evolution of Populus nigra. On the basis of the analysis of the genetic structure of Populus nigra, it was recommended that future the screening of nitrogen-efficient Populus nigra parent material should be established mainly in central Europe and southern Europe.