Table I.
Phenotypic characters of transgenic and wild-type hybrid aspen trees
| Line | n | Tree Height | Stem Diameter | Internode Length | Leaf Width | Leaf Length | Secondary Shoots |
|---|---|---|---|---|---|---|---|
| cm | mm | no. | |||||
| Wild type | 9 | 128 | 10.6 | 29.1 | 145 | 192 | 13.7 |
| B | 4 | 122 | 9.2* | 33.1* | 133 | 173 | 5.8** |
| C | 5 | 99*** | 9.1* | 34.1** | 115** | 152** | 3.2*** |
| D | 5 | 131 | 11.3 | 33.8** | 132 | 179 | 5.8*** |
| G | 6 | 127 | 9.4 | 35.0*** | 125* | 173 | 6.2*** |
| H | 5 | 125 | 9.7 | 36.5** | 128 | 166* | 3.6*** |
| J | 5 | 131 | 11.2 | 36.1*** | 143 | 184 | 4.2*** |
| L | 4 | 127 | 10.2 | 34.3** | 133 | 177 | 5.0*** |
| O | 4 | 124 | 10.9 | 33.1* | 144 | 181 | 5.5*** |
Stem diameter was measured 7 cm from the base. Internode length was measured for 10 internodes subjacent to the uppermost fully expanded leaf for each tree. Leaf width and length was measured in three full-sized mature leaves for each tree. The no. of secondary shoots from axillary buds was counted 30 d after decapitation. The asterisks indicate statistical significance of difference between the means of the wild type and the transgenic line (Student's t test); *, 0.05 > P > 0.01; **, 0.01 > P > 0.001; and ***, P < 0.001.