Table 5. Biological characteristics of F1-progeny of Phytophthora capsici from sexual crossing.
| Colony diameter (mm)z | ||||||||
| Isolatex | Sensitivityy | Mating type | 13°C | 20°C | 25°C | 30°C | Zoosporeproduction (105)u | Diseaseindex (%)u |
| PCAS2 | S | A2 | 41.5 | 60.5 | 62.5 | 84 | 2.4 | 64 |
| RZ13-2 | R | A1 | 33.0 | 56.0 | 63.0 | 57.5 | 0.1 | 48 |
| XH38-13 | R | A1 | 34.0 | 61.0 | 67.0 | 53.5 | 1.0 | 92 |
| F1-4-6 | S | A2 | 39.0+ | 58.0+ | 60.0 − | 65.0+ | 5.0+ | 76+ |
| F1-4-9 | R | A1 | 32.0 | 53.0 | 57.0 − | 54.5 − | 4.3+ | 100+ |
| F1-4-15 | R | A2 | 34.5+ | 57.0+ | 62.0 | 67.5+ | 1.6 | 58 |
| F1-4-18 | R | A1 | 35.0+ | 65.5+ | 67.5+ | 74.0+ | 14.3+ | 78+ |
| F1-4-26 | S | A1 | 42.0+ | 66.5+ | 75.5+ | 85.0+ | 0.3 | 46 |
| F1-4-58 | R | A2 | 31.5 − | 54.0 | 61.5 | 67.5+ | 1.1 | 64 |
| F1-4-68 | S | A2 | 42.0+ | 52.5 | 61.0 | 57.5 | 0.3 | 90+ |
| F1-4-86 | S | A2 | 37.5+ | 55.0 | 62.5 | 68.0+ | 0.5 | 86+ |
| F1-4-92 | R | A1A2 | 46.0+ | 67.5+ | 72.5+ | 84.0+ | 10.8+ | 88+ |
| F1-4-96 | R | A1 | 34.0 | 64.5+ | 73.5+ | 61.0+ | 0.4 | 72+ |
| F1-6-5 | R | A2 | 34.0 | 65.0+ | 70.0+ | 82.5+ | 1.4 | 58− |
| F1-6-6 | S | A2 | 43.5+ | 66.5+ | 71.0+ | 77.5+ | 2.5 | 78 |
| F1-6-10 | R | A2 | 32.0− | 61.0 | 66.0 | 80.0+ | 0.4− | 86 |
| F1-6-16 | R | A1 | 37.5+ | 50.5− | 60.5− | 64.5+ | 3.5+ | 86 |
| F1-6-18 | R | A2 | 33.5 | 62.0 | 62.5− | 83.5+ | 0.1− | 86 |
| F1-6-25 | S | A1 | 33.5 | 61.0 | 67.0 | 72.5+ | 1.1 | 90 |
| F1-6-56 | R | A1 | 33.5 | 55.5− | 59.5− | 59.0+ | 4.0+ | 84 |
| F1-6-68 | S | A1 | 36.0+ | 58.0− | 66.5 | 77.5+ | 1.9 | 84 |
| F1-6-81 | R | A2 | 27.0− | 51.0− | 61.5− | 67.5+ | 0.7 | 62 |
| F1-6-88 | S | A1 | 36.5+ | 55.5− | 62.5− | 70.0+ | 4.0+ | 86 |
Isolates in bold font are the parent lines of the progeny.
Sexual progeny were only considered resistant (R) when they were able to grow on PDA plates amended with 30 µg ml-1 zoxamide.
Colony diameters were measured after 5 days of incubation in darkness. The mean values of the sexual progeny within each column were compared to the values from their parents;+and – indicate faster or slower growth, respectively, relative to the parent (α = 0.05).
Zoospore production expressed as number of zoospores per square centimeter of culture; disease index determined from the blight severity scale of inoculated pepper plants.
The mean values of the sexual progeny within each column were compared to the values from their parents;+and – indicate more or less, respectively, relative to the parent (α = 0.05).