Abstract:

Gene R1000 and R 1000(PTVK85)were transformed to Populus tomentosa, and their clones were achieved. After the vitro plantlets of the clones were transplanted to field, their cutting experiment, growth measurement and morphological observation were carried out. The clones whose rooting rates were improved significantly accounted for 69.2%of the total tested clones. Of these clones, only 44.4% were observed neither to reduce their productivity nor to change their morpgological characters. For the rest of the clones, the height growth of one year-old cutting plants decreased about 30%. The total dry weight of stems, branches and leaves was 50 % lower. There was a larger change in leaf morphological characters. The branch angles was narrow and the growth increment of branch was higher. Therefore, their economic values for timber production were reduced. Besides, the plants of these clones appeared to have more buds and relatively higher net leaf weight.

Key words: Populus tomentosa, R1000 and R1000 (PTVK85), Rooting capacity, Growth increment, Morphological change