Host-pathogen interactions in the wheat-Mycosphaerella graminicola pathosystem
Bibliographic record
Abstract
'Mycosphaerella graminicola' (Fuckel) Schroeter (anamorph: 'Septoria tritici' Rob.ex Desm.), the causal agent of Septoria leaf blotch of wheat, has increased in prevalence in Western Canada in recent years. Physiologic variation has been reported for this pathogen in other countries. Isolates collected from bread wheat growing in Manitoba and Saskatchewan were tested for virulence on a set of tetraploid and hexaploid wheat differential lines. Seedlings were inoculated with a conidial suspension and assessed three weeks later for the presence of necrosis, chlorosis and pycnidia to identify virulence patterns. Reactions of the differential host lines to different isolates ranged from susceptible to near-immune. Differences in virulence patterns indicated that two races were present in the pathogen population of Western Canada, suggesting that physiological specialization does occur. Cytological observations of resistant and near-immune reactions suggested that a hypersensitive response occurred in both tetraploid and hexaploid wheat lines as early as two to three days post-inoculation. In these lines, mesophyll cell collapse occurred in areas surrounding the stomatal penetration sites. These cells fluoresced when stained with KOH-aniline blue. There was no evidence of direct penetration of the mesophyll cells. Limited intercellular growth of hyphae did occur in both resistant lines. In the susceptible lines, both tetraploid and hexaploid, extensive intercellular growth of hyphae was consistently observed in the mesophyll tissue. Mesophyll cell collapse and pycnidia formation in the substomatal chambers of infected stomates began eight to ten days post-inoculation. No fluorescence was evident in the compatible reaction, at any of the sampling periods.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".