Physiologic specialization of<i>Puccinia triticina</i>, the causal agent of wheat leaf rust, in Canada in 2006
Bibliographic record
Abstract
Puccinia triticina, the causal agent of wheat leaf rust, was collected from across Canada in 2006 to determine the virulence spectrum of this pathogen. From 353 single-pustule isolates, 31 virulence phenotypes were identified. There were 20 virulence phenotypes among 315 isolates from Manitoba and Saskatchewan. The most common phenotypes were TDBG (56.2%), TDBJ (18.7%), and MFPS (5.4%). The frequency of virulence to Lr24 (86.3%) was very high, whereas it was very low for Lr16 (0.3%) when compared with years prior to 2005. From 19 isolates collected in Ontario, 14 isolates were MFDS; 2 were TBDS; and 1 isolate each were MBMR, MDNS, and TFPJ. MFDS was the only virulence phenotype identified from three isolates collected in Quebec. There was a similar rise in 2006 in the frequency of virulence to Lr24 in Ontario (84.2%) and Quebec (100%), although different virulence phenotypes were responsible for this increase in eastern Canada compared with western Canada. Nine virulence phenotypes were identified among 16 isolates from Prince Edward Island (PEI). The most common of these were MCPR (four isolates), MBPR (three isolates), and MBDS and MDDS (two isolates each). Five of these nine virulence phenotypes were not found in the rest of Canada in 2006 nor in the past 5 years. This is an indication that the PEI population is somewhat distinct from those in the other regions of Canada. When 50 isolates representing most of the virulence phenotypes and the different regions in Canada were inoculated onto adult plants, there were 47, 45, 1, and 30 isolates virulent to Lr12, Lr13, Lr35, and Lr37, respectively. These 50 representative isolates were also inoculated on 12 additional ‘Thatcher’ near-isogenic lines at the seedling stage, and there were 25, 46, 48, 50, 43, 43, 2, and 25 isolates virulent to Lr2b, Lr3bg, Lr14b, Lr15, Lr20, Lr23, Lr25, and Lr28, respectively. All isolates tested were avirulent to Lr19, Lr21, Lr22a, Lr29, Lr32, and Lr34
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.000 |
| Scholarly communication | 0.001 | 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".