Abstract: A total of 10 transgene and one control Populus simonii×P.nigra clones were used to investigate and analyze the variation of growth curve of tree height and basic diameter. The result showed that tree height and basic diameter growth process curve accord with “S” shape. The coefficient of Logistic model was higher than 0.9 which indicated that the function of the model was effective. There were remarkable differences within different variation sources between the tree height and basic diameter of different clones (P＜0.01). The average rapid growth last for 44 d for tree height and 70 d for basic diameter, respectively. The average increments during rapid growth period were 1.85 cm and 0.99 mm for tree height and basic diameter, respectively. There were remarkably positive correlation coefficients between tree height, basic diameter, average increment during rapid growth period and average increment each day during rapid growth period. XL-1 and XL-9 grew fast, tree heights (basic diameters) were 16.73%(32.82%) and 10.92%(22.68%) higher than control, respectively, which indicated transgene remarkably affect tree growth and this research can provide fundamental basis for future research.

Key words: TaLEA, transgene, Logistic, model, variation