Ascospore germination patterns revealed ascomycetous biotrophic mycoparasite specificity to <i>Fusarium</i> hosts
Bibliographic record
Abstract
Sphaerodes mycoparasitica is an ascomycetous mycoparasitic taxon commonly found growing and sporulating on Fusarium pathogens in Canada. Ascospores of S. mycoparasitica failed to germinate under different standard laboratory conditions (sterile distilled water, water agar, and commercially available media), even after heat- and cold-shock treatments. In contrast, spore germination was obtained on commercial potato dextrose agar medium amended with Fusarium filtrates. Significant improvement in the percentage of spore germination was obtained for the spores suspended in Fusarium filtrates. Fusarium avenaceum and Fusarium oxysporum filtrates induced the highest germination, whereas Fusarium sporotrichioides and Fusarium proliferatum triggered lower germination frequency. Filtrates of beneficial fungal inoculants, including Trichoderma harzianum (RootShield®), Penicillium bilaii (JumpStart®), and Chaetomium globosum , had no impact on germination. Ascospore suspensions showed a double-polar germination pattern in F. avenaceum filtrate and single-polar germination when challenged with F. oxysporum filtrate. Sphaerodes mycoparasitica grown on F. oxysporum maintained the same spore germination patterns when transferred on F. avenaceum for three subsequent offspring generations, indicating a stable genome-regulated expression. Preliminary phylogenetic analyses based on large subunit rDNA showed the evolution of a group of mycoparasitic Sphaerodes species from nonmycoparasitic ancestors, but no clear evidence of coevolution or cospeciation between known Sphaerodes and their Fusarium hosts.
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 | 0.000 | 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) | 0.001 | 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".