Table 2.
The effect of HU on germination and appressoria formation in five different Colletotrichum species. Fungi were germinated on the surface of a Petri dish in water (C. magna, C. coccodes, C. acutatum) or in PDB medium (C. gloeosporioides, C. musae). Spore concentration was 105/ml in all species. Percentage germination and appressoria formation were determined after 7 h (C. gloeosporioides, C. coccodes), 9 h (C. acutatum, C. musae), or 13 h (C. magna). In each sample 150 spores were counted, with two independent samples per experiment. Appresoria percentage is the percentage of germ tubes that formed appressoria.
| Species | Germination (%) | Appressoria (%) | ||
| H2O | HU | H2O | HU | |
| C. gloeosporioides | 100 | 100 | 83.5 ± 7.5 | 77 ± 3 |
| C. magna | 91.5 ± 6 | 45.5 ± 12.5 | 95 ± 3 | 75 ± 10 |
| C. acutatum | 80 ± 15 | 73 ± 3 | 47 ± 1 | 33 ± 2 |
| C. musae | 94 ± 2 | 86.5 ± 6.5 | 35.5 ± 5.5 | 25.5 ± 7.5 |
| C. coccodes | 63.5 ± 15 | 26.5 ± 22 | 66 ± 1 | 50 ± 25 |