Comparative virulence of chlorosis-inducing races of<i>Pyrenophora tritici-repentis</i>
Bibliographic record
Abstract
The fungal pathogen Pyrenophora tritici-repentis (Died.) Drechs. causes tan spot, an important foliar disease of wheat worldwide. To date, five races of this pathogen have been described. We report the existence of a sixth race and compare the chlorosis symptoms produced by various isolates of P. tritici-repentis representing different races. Isolate Alg-H2, collected in eastern Algeria, has a virulence pattern that combines those of races 3 and 5. Thus, we propose that this isolate be classified in a new race, designated race 6. Isolate 92-171R5, collected on the Manitoba—Saskatchewan border, possesses the same virulence pattern as race 5 isolates but is much less aggressive based on the size of the lesions and the extent of the chlorosis it causes. Ptr ToxB was purified from Alg-H2 culture filtrate, following essentially the same protocol as reported earlier for its purification from race 5 isolate Alg 3-24. The presence of a toxic principle, with the same specificity as Ptr ToxB, was also demonstrated in 92-171R5 culture filtrate.
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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 | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| 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".