fungal sclerotium formation
traitmech:000660 · CLASS · PROPOSED
A morphological phenotype in which a fungus forms compact mycelial resting bodies called sclerotia.
Trait evidence
-
DOI:10.1128/AEM.00565-08Aspergillus flavus differentiates to produce asexual dispersing spores (conidia) or overwintering survival structures called sclerotia.
-
DOI:10.3390/jof9070737WT and ΔSSA-178C formed black mature sclerotia on the colonies and at the rim of the Petri dishes
-
DOI:10.1016/j.micres.2019.126326there are no structural differences in the three stages of formation of melanized and non-melanized sclerotium.
-
DOI:10.1128/spectrum.02084-21There are different types of sclerotia-like fungal structures, such as the true sclerotia, the pseudosclerotia, the small sclerotia, and the microsclerotia.
-
DOI:10.2478/s11658-007-0047-5Sclerotization only took place when the plasmodia were starved and very slowly dried.
Provenance
- Identifier source
- TraitMech local identifier
- Definition source
DOI:10.1128/AEM.00565-08
Parent traits (1)
kg-microbe context
No kg-microbe node embedding matched this record in the 2026-04-25 deepwalk.
Canonical examples
-
Sclerotinia sclerotiorum
NCBITaxon:5180DOI:10.3390/jof9070737
Discussions and Knowledge Gaps
Reconcile legacy labels and the scope of sclerotial structures.
The explicit fungal label excludes the dormant plasmodial usage in Fuligo. Retain phenotype METPO:1000059 rather than plant pathogen, black pigmented, fungal conidiation traitmech:000657 or chlamydospore formation traitmech:000658. The pinned ontology contains only deprecated bare-label sclerotia classes METPO:0000117, METPO:000118 and METPO:1000398, without definitions or replacement links. Their original scope is unresolved; do not silently reactivate them or assert equivalence to this organismal formation phenotype. Upstream review must reconcile that legacy. QuickGO resolves GO:1990045 as sclerotium development, a biological process rather than an exact organismal phenotype; no xref or SSSOM mapping is asserted. The 2022 source distinguishes true, small, pseudo- and microsclerotial structures. Whether these need separate subclasses or mappings requires further primary morphology review; no exact synonyms, universal size threshold, three-layer requirement or host-material exclusion is imposed.
Separate formation from maturation, survival and mechanism.
Initiation, maturation, persistence and germination are distinct readouts. Formation of a named resting body does not establish a particular dormancy duration, survival after stress or later germinability. Size, pigmentation, nutrient regime and density responses are not universal defining requirements. Do not infer plant pathogenicity, aflatoxin production or a sexual/asexual reproductive mode from formation alone. The SSA study separates delayed maturation from a complete block, and total mass per flask from body number. A causal graph awaits taxon-specific perturbation/complementation assessment, remaining figures/supplements and authority-verified protein accessions. Candidate gene possession or expression of ROS, pigmentation or signaling genes is not itself the formation phenotype.
Curation history
-
·
MINTED_TRAITMECH_ID · codex
Added fungal sclerotium formation with five directly checked source snippets, a provenance-qualified strain 1980 example and explicit legacy-identity, morphology and functional limits. Ignored-and-hidden searches found deprecated bare labels but no live exact formation trait. Reserved METPO:1061300 in v536; existing records unchanged and protein-level mechanism deferred.
Recorded curation sessions
-
· claude-code
- CREATE — Add fungal sclerotium formation with explicit identity and developmental scope
Added traitmech:000660, a PROPOSED MORPHOLOGY phenotype under METPO:1000059, with five directly checked source snippets and a provenance-qualified wild-type strain 1980 example. Ignored-and-hidden duplicate searches distinguish three deprecated bare sclerotia labels from the new organismal phenotype; legacy identity and GO process mapping remain unresolved. Reserved METPO:1061300 in proposal v536. Formation, maturation, count versus mass and functional readouts are distinguished; no causal graph, xrefs or exact synonyms are asserted. Twenty focused writer tests and dry-run validation passed before application; broader generated-artifact, corpus and online checks follow in the PR receipt. Existing trait records are unchanged.
- CREATE — Add fungal sclerotium formation with explicit identity and developmental scope
-
· codex
- AUDIT — Correct session actor attribution without rewriting history
Correction to history/records/fungal_sclerotium_formation/2026-10-07T064956Z-claude-code-77563e.yaml: the actual curation actor was codex, using model gpt-5 and agent_tool codex, not the scaffolder default claude-code recorded in session.actors.name. The original append-only record is preserved. No TraitRecord content changes in this audit. The add-trait skill now warns that --model and --agent-tool do not override --actor-name and requires inspecting the emitted session actors. README morphology prose is reconciled with the live 14 PROPOSED morphology records. Tracked by issue #1776.
- AUDIT — Correct session actor attribution without rewriting history