Table 1. Inoculation methods, type of Leptosphaeria maculans inoculum, number of plants inoculated, design of experiments and assessment methods used in each of the controlled environment experiments with the doubled haploid (DH) lines A30 or C119.
Exp. | Inoculum1 | Design | No. of plants inoculated2 | Assessment method |
L. maculans growth in leaf, leaf lamina inoculation | ||||
LExpt 1 | Conidia (GFP) | Randomised block | 8×2 plants, 3 leaves per plant | Lesion area3, distance grown (DG) along vein/petiole viewed by GFP |
LExpt 2 | Conidia (GFP) | Complete randomised | 8 plants, 3 leaves per plant | Lesion area, DG viewed by GFP |
LExpt 3 | Ascospores | Randomised block | 5×2 plants, 3 leaves per plant | DG assessed by extent of necrosis, L. maculans DNA in leaf petiole (qPCR) |
LExpt 4 | Ascospores | Complete randomised | 12 plants, 3 leaves per plant | DG assessed by extent of necrosis, qPCR |
LExpt 5 | Ascospores | Complete randomised | 8 plants, 2 leaves per plant | Lesion area, DG assessed by extent of necrosis, qPCR |
L. maculans growth in stem, leaf petiole inoculation | ||||
PExpt 1 | Conidia (GFP) | Complete randomised | 10 plants, 2 petioles per plant | Stem canker score, extent of L. maculans growth in stem viewed by GFP |
PExpt 2 | Ascospores | Complete randomised | 5 plants, 3 petioles per plant | Stem canker score, L. maculans DNA in stem (qPCR) |
PExpt 3 | Ascospores | Complete randomised | 12 plants, 2 petioles per plant | Stem canker score, qPCR |
PExpt 4 | Ascospores | Complete randomised | 12 plants, 2 petioles per plant | Stem canker score, qPCR |
1 L. maculans ascospores obtained from naturally infected oilseed rape stem base debris collected in August 2007; conidia were produced by GFP-transformed isolate ME24/3.13.
Plants were inoculated when they had three fully expanded leaves. For details of leaf lamina or leaf petiole inoculation, see Fig. 2. All experiments were done at 20°C with alternating 12 h light/12 h darkness.
The lesion area was estimated by multiplying the lesion length by lesion width.