Study On The Growth Process Genetic Variation And Selection Of The Poplar Clones

The material of this paper is the investigated date in 1-11 years of the height(H),ground diameter(D) and volume(V) of the 34 initial selected clones . Based on the analysis of the genetic variation of the three growth characters,this paper studies the genetic variation of the growth process and discusses the clonal selection. 1,The analysis results of genetic variation and correlation of the H,D and V in 1-11years prove that the heritability of the three growth characters tend to stabilization until 3-5 years after being planted. There are strong correlation between growth characters and moderate strong or strong juvenile-mature correlation. The average H ,D and V in fast-growth period are 59 %,59%and61 % respectively of the total growth in 1-11years,and then have a slowly increase after the fast-growth period. 2,The growth progress can be stimulated by the Logistic equation well and the equation parameters k ,a,b have moderate or high heritability, they also have moderate or high positive correlation with observed date. The genetic variation analysis of growth process parameters proves that the genetic variation of different growth dynamics parameters have a great variation. The growth dynamics parameters are reduced 4 factors by factor analysis and the factors can explain 89.57% of the total variation. The clones can be divided into 7 clusters through cluster analysis based the value of factors, the clones of the third cluster is better in growth dynamics as a whole. 3,Aggregate selection index method to improve the growth process characters ,the value of the clones 4 factors are the improved parameters, an index equation can be got : I=0.05753Y₁+0.56421Y₂-0.30833Y₃+1.45638Y₄ based on the equation, the clones such as 1011,1101,797,194,187,447,95 should be selected. The effect of selection can be tested by the value of the ⊿H,rHI,h2I,⊿a .The value of ⊿H,rHI,h2I are 4.272,0.790,0.412 , the value of ⊿a is 0.821,1.349,0.980,0.592 respectively. From this we can know that perfect progress can be gained by this method. The growth dynamics parameters of V can gain improve than others, the growth dynamics parameters of D gain less improve than other parameters after being improved.