Table 1. Overview of the EST data set.
| Tissue | Code | Populus genotype | ESTs, n | Average length,* bp |
|---|---|---|---|---|
| Cambial zone | A + B | tremula × tremuloides | 6,326 | 367 |
| Active cambium | UB | tremula | 4,647 | 366 |
| Dormant cambium | UA | tremula | 3,655 | 403 |
| Tension wood | G | tremula × tremuloides | 5,723 | 408 |
| Wood cell death | X | tremula × tremuloides | 4,867 | 548 |
| Young leaves | C | tremula × tremuloides | 5,013 | 351 |
| Senescing leaves | I | tremula | 5,726 | 366 |
| Cold-stressed leaves | L | tremula × tremuloides | 4,066 | 448 |
| Dormant buds | Q | tremula | 5,815 | 558 |
| Petioles | P | tremula | 6,443 | 559 |
| Virus/fungal-infected leaves | Y | tremula | 1,395 | 438 |
| Floral buds | F | trichocarpa | 6,760 | 351 |
| Female catkins | M | trichocarpa | 6,112 | 553 |
| Male catkins | V | trichocarpa | 4,855 | 485 |
| Apical shoot | K | tremula × tremuloides | 5,380 | 481 |
| Shoot meristem | T | tremula × tremuloides | 8,371 | 535 |
| Bark | N | tremula × tremuloides | 4,891 | 548 |
| Roots | R | tremula × tremuloides | 5,786 | 593 |
| Imbibed seeds | S | tremula | 6,188 | 502 |
*
The part of the sequences that passed the paracel transcriptassembler filters. The average read length has increased substantally during the course of this work.