Evolutionary analysis of subsection <i>Magnicellulatae</i> of <i>Podosphaera</i> section <i>Sphaerotheca</i> (Erysiphales) based on the rDNA internal transcribed spacer sequences with special reference to host plants
Why this work is in the frame
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Bibliographic record
Abstract
To understand the evolutionary history of subsection Magnicellulatae of Podosphaera section Sphaerotheca, nucleotide sequences of the rDNA internal transcribed spacer region were determined for 79 isolates from 60 host species. With the exception of two species occurring on the Scrophulariaceae, all isolates formed a large, well-defined clade. Genetic diversity among species on the Scrophulariaceae was much larger than the diversity among all other taxa, and the first split of the Magnicellulatae clade was shared by these species. This suggests that the Scrophulariaceae is the earliest host of subsection Magnicellulatae. Isolates from the Asteraceae shared the largest sequence diversity and were represented in all major groups. Most members of the basal groups consisted of isolates from the Asteraceae. This suggests that an early radiation in the large clade occurred on the Asteraceae. Based on the small sequence diversity and placement at the terminal end of the phylogenetic tree of isolates from the Cucurbitaceae and the Fabaceae, it is suggested that the ability of subsection Magnicellulatae to infect these families was acquired more recently. The groupings of fungal taxa by molecular phylogeny showed general agreement with groupings by infectivity, which suggests niche separation caused by host specialization triggers genetic divergence in these fungi.Key words: Ascomycetes, Erysiphaceae, host range, phylogeny, Podosphaera, Sphaerotheca.
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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 | 0.001 |
| 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) | 0.003 | 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 it