Persistent virulence associations in sexual populations of <i>Puccinia coronata</i>
Bibliographic record
Abstract
From 1992 to 1999, 18 sets of aecial or uredinial isolates of Puccinia coronata were collected from two sites in Minnesota for analysis of virulence associations. In addition, one set of aecial isolates was collected in Ontario and one in New York. Also, aecial isolates and uredinial isolates collected from scattered locations in Minnesota in 1994 and again in 1995 were bulked for comparison with populations from discrete sites. Isolates were tested for virulence on 26 single‐ Pc gene oat lines. Virulences to 14 pairs of differential lines were found to be significantly ( P < 0·05) associated in linkage disequilibrium in at least six of the 24 site × year populations. The significant virulence associations were found among both uredinial and aecial isolates. Linkage disequilibria normally dissipate with repeated generations of sexual reproduction. Finding the same virulence associations repeatedly over years and locations for sexual populations of P. coronata indicates that certain pairs of virulence genes (or avirulence genes) contribute to increased fitness when they occur together, even in the absence of the corresponding resistance genes in the host. Mean virulence complexity did not differ significantly between a site with no known Pc genes in the host population and a site with low frequencies of Pc genes, suggesting little or no selection pressure against unnecessary virulence per se . Means and standard deviations of virulence complexity were similar for aecial and uredinial isolates within sites, which suggests that selection did not strongly favour either heterozygotes or intermediate virulence complexity during uredinial generations.
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 distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| 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) | 0.000 | 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 teacher head, 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".