| Concentration (g/l) | % of explants without reaction | % of callogenous explants | Comments on the development of calluses |
| 0 | 5.2a | 86.5b | Green white callus, compact, friable and well developed (0.7 - 1 cm) |
| 0.5 | 60.0b | 13.3a | Brown callus, compact, friable and poorly developed (0.4 - 0.5 cm) |
| 1 | 59.0b | 10.0a | Brown callus, compact, friable and poorly developed (0.2 - 0.3 cm) |