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
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.
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 | 0.000 | 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 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".