Figure 1.
Gummosis in tulip bulbs cv. Apeldoorn induced by Fusarium oxysporum f. sp. tulipae (on left) and by ethephon (2-chloroethylphosphonic acid) – ethylene releasing compounds (on right). Author of photographs: Justyna Goraj-Koniarska.
Figure 2.
Experiment with Fusarium oxysporum f. sp. tulipae. In the control treatment (left), no mycelial growth was observed. In the treatment supplemented with gums, the mycelium develops and produces pigments.
Figure 3.
The UV chromatogram of the extract from mycelium of Fusarium oxysporum f. sp. tulipae grown in tulip gum solution.
Table 1.
Bikaverin and norbikaverin content (mg/100 mg dry matter) in Fusarium oxysporum f. sp. tulipae mycelium grown with tulip gum solution.
| Sample | Norbikaverin (Rt = 44.02) | Bikaverin (Rt = 47.15) | Total |
|---|---|---|---|
| Mycelium after 7 days | 0.64 ± 0.06 | 2.94 ± 0.26 | 3.58 ± 0.32 |
| Mycelium after 15 days | 1.02 ± 0.11 | 4.62 ± 0.55 | 5.64 ± 0.62 |