Variation in virulence, host specificity, hyphal growth rate, and size of the aplerotic zone in successive single-zoospore and single-oospore progenies of <i>Aphanomyces euteiches</i>
Bibliographic record
Abstract
Variation in virulence, host specificity, hyphal growth rate, and size of the aplerotic zone were studied in Aphanomyces euteiches using successive single-zoospore progeny (asexual reproduction) and single-oospore progeny from selling (sexual reproduction). No variation in virulence or host specificity to pea or bean was found in generations of single-zoospore or single-oospore isolates derived from four field isolates. In each isolate, hyphal growth rate and size of the aplerotic zone were relatively stable traits among six generations of single-spore progeny; the phenotypes of progeny remained similar to parental phenotypes. The traits were found to be the same within, but different between, two pea and two bean pathotype isolates. Stable randomly amplified polymorphic DNA (RAPD) markers associated with different isolates were selected in successive generations of zoospore and selfed oospore progeny and could be used to distinguish the four isolates. Results suggest that the genes involved in determining the studied traits are homozygous in the isolates used and that new forms of the pathogen differing from parental strains cannot be obtained by the generation of successive zoospore or selfed oospore populations. Therefore, other than variability generated by mutation, major variability in A. euteiches most likely originates by outcrossing.
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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 | 0.001 | 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".