Table 1. Callus rating scores (0–3) for seven Populus genotypes predicted to have high callus formation potential and seven Populus genotypes with low callus formation potential.
Dash (-) indicates callus cultures that were lost due to contamination.
| Genotype | Predicted Status | High cytokinin, Low auxin | High cytokinin, Med. auxin | High cytokinin, High auxin | Low cytokinin, Low auxin | Low cytokinin, Med. auxin | Low cytokinin, High auxin | Mean1 |
|---|---|---|---|---|---|---|---|---|
| BESC-18 | High | 1.5 | 2.0 | - | 1.5 | 1.0 | 2.5 | 1.90 |
| BESC-233 | High | 3.0 | 3.0 | - | - | 1.0 | 2.0 | 2.75 |
| BESC-823 | High | 2.5 | 2.5 | - | 2.0 | - | 2.0 | 2.25 |
| GW-9795 | High | 3.0 | 2.0 | 1.5 | 2.0 | 2.0 | 2.5 | 2.00 |
| GW-9877 | High | 1.0 | 2.0 | 1.0 | 2.0 | 1.5 | 1.50 | |
| GW-9920 | High | 2.5 | 2.5 | 2.5 | - | 3.0 | 2.5 | 2.60 |
| HOMB-21-2 | High | 2.0 | 2.0 | 1.5 | 2.0 | - | 1.88 | |
| Mean | 2.3 | 2.1 | 2.0 | 1.6 | 2.2 | 3.3 | 2.09 | |
| BESC-100 | Low | 2.0 | 2.5 | 1.5 | 2.0 | 2.0 | 2.0 | 2.00 |
| BESC-106 | Low | 1.5 | 0.5 | 1.0 | 1.0 | 1.5 | 0.5 | 1.00 |
| BESC-352 | Low | - | 1.5 | 0.5 | 2.0 | 1.5 | 2.0 | 1.50 |
| BESC-856 | Low | 0.5 | 0.0 | 0.0 | 1.0 | - | 1.0 | 0.50 |
| BESC-89 | Low | 0.0 | 2.0 | - | 1.5 | - | 2.0 | 1.38 |
| GW-9904 | Low | 0.0 | 0.0 | 0.5 | 0.5 | 0.5 | - | 0.30 |
| YALD-27-2 | Low | 0.0 | 0.0 | 0.0 | 0.5 | 0.0 | 0.0 | 0.08 |
| Mean | 0.7 | 0.9 | 0.6 | 1.2 | 1.1 | 1.3 | 0.96 | |
| Overall Mean | 1.5 | 1.6 | 1.2 | 1.4 | 1.7 | 1.8 |
1Overall callus rating means between genotypes with high versus low callus formation potential was significant based on a t-test for two samples assuming unequal variances at p≤0.05.