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nematode egg-hatching stimulatory activity

traitmech:000724 · CLASS · PROPOSED

A physiological capability of a microorganism to increase nematode egg hatching over a defined observation interval relative to comparable controls without that microbial influence.

Trait evidence (2)

  • DOI:10.1163/156854104323072883
    Fifteen isolates (5.9%) produced compounds that strongly stimulated SCN egg hatch compared to PDB controls (Table 1).

    Meyer et al. 2004, Results, printed page 28/PDF page 6, lower left. SCN denotes Heterodera glycines; PDB is potato dextrose broth. Native UNRESOLVED; Crossref and the USDA-hosted article verify identity. The typeset span was visually checked; PDFKit splits controls across lines, so plain whitespace normalization does not match. Hatch counts include motile and immotile juveniles at 14 days, normalized to initial eggs and then uninoculated PDB hatch. Three or seven days denotes culture age, not egg exposure. The source-specific strong-effect threshold combines effect size and statistical significance; it is not a universal trait cutoff. Forty isolates were retested, not all 253. Nutrient depletion versus added stimulants remains unresolved despite the quote's compound wording. pH was measured, not neutralized. Host, isolate and culture age can change effect direction.

  • DOI:10.1186/s13071-015-0986-z
    When incubated with Gram-positive bacteria, only T. muris eggs showed noticeable hatching after 20 h, although with high variability.

    Vejzagic et al. 2015, PMID:26174801, PMCID:PMC4501204, scientific Abstract Results; exact normalized publisher/XML match and native VERIFIED. This is its own bacterial experiment, not a citation of Meyer. Full Results and actual Figure 2 show Enterococcus caccae and Lactobacillus reuteri above bacteria-free controls after 20 h without antimicrobials, with substantial within- and between-run variability. Hatch is released larvae divided by initial embryonated eggs. T. muris and T. suis are Trichuris muris and Trichuris suis; little T. suis hatch in these conditions is not absolute inability. Antimicrobials and egg storage history affect interpretation. The E. coli strain/concentration ANOVA excludes near-zero controls; that analysis is not a statistical contrast against no bacteria. No direct-contact mechanism is inferred from background citations.

Provenance

Identifier source
TraitMech local identifier
Definition source
DOI:10.1163/156854104323072883

Parent traits (1)

kg-microbe context

No kg-microbe node embedding matched this record in the 2026-04-25 deepwalk.

Discussions and Knowledge Gaps (2)

Open questions attached to this trait. Seeded by just knowledge-gap-scan and curated; see the corpus-wide index.

Refine the hierarchy without changing the microbial actor or positive-hatch endpoint.

CURATION TODO OPEN nematode-egg-hatching-stimulation-scope-and-hierarchy · raised by codex · 2026-10-14

Not yet attached to a section of this record — a curator sets attaches_to (e.g. causal_graphs#some_edge) so the gap shows beside the mechanism it concerns.

This is a microbial capability to increase hatching, not merely lack of inhibition, the microorganism's own development or the nematode's susceptibility. Embryogenesis without emergence, attraction, trapping, juvenile paralysis or killing alone is insufficient. Feeding, infection and benefit to the microbe are not required. No organism-level disjointness from hatch inhibition is asserted: host and culture conditions can reverse responses. Phenotype METPO:1000059 is the conservative parent. Pinned/current METPO screening found only unrelated fried-egg-shaped colony, not an exact active or deprecated counterpart in inspected owners; v600 proposes the class. No exact synonym or xref is asserted. Neither host-generalism nor a secretion/contact mechanism is implied.

Resolve host range, strain provenance and mechanism before adding canonical examples or causal edges.

KNOWLEDGE GAP OPEN nematode-egg-hatching-stimulation-source-and-mechanism-limits · raised by codex · 2026-10-14

Not yet attached to a section of this record — a curator sets attaches_to (e.g. causal_graphs#some_edge) so the gap shows beside the mechanism it concerns.

Meyer explicitly leaves nutrient depletion versus added compounds unresolved. Some fungal filtrates stimulate one host while inhibiting another, and culture age can reverse activity. The bacterial study reports variable hatch and contrasts two Trichuris hosts; neither study defines universal potency or host range. No canonical taxon, shared active molecule, protein or causal graph is inferred. No field efficacy, environmental safety, infectivity benefit or therapeutic use is asserted. Methods, own results and selected figures were inspected, not the full experimental raw data. Direct snippets and bounded notice checks are retained in the verification sidecar. Crossmark responses were script shells, not current-status verdicts; Meyer publisher access returned 403. No comprehensive correction/retraction clearance is claimed.

Curation history

  1. · MINTED_TRAITMECH_ID · codex

    Added microbial nematode egg-hatching stimulatory activity with two DOI-backed primary studies and directly checked 17-word and 19-word excerpts. Preserved native UNRESOLVED/VERIFIED outcomes, source-specific comparators, host dependence and mechanism uncertainty. Positive hatch enhancement is not merely lack of inhibition. Reserved 000724, v600 and 1067700-1067799 after ignored/hidden current-copy, retained-history and open/draft PR checks; decimal measurements, embedding coordinates and broad editor ranges are not competing reservations. No exact active METPO counterpart identified in inspected owners. Other records unchanged. Timestamp records observed acceptance, not later writing.

Recorded curation sessions

  • · codex
    • CREATE — Add nematode egg-hatching stimulatory activity

      Added one PROPOSED microbial capability increasing nematode egg hatching over a defined observation interval relative to comparable controls without that microbial influence. Meyer 2004 supplies definition support; Vejzagic 2015 is a second primary bacterial experiment. Directly checked 17-word and 19-word excerpts preserve source-specific thresholds, controls, host dependence and variable responses. Maintained abstract-function probes returned UNRESOLVED and VERIFIED respectively; the actual record-specific CLI result belongs in the verification sidecar. Hatch enhancement is not merely lack of inhibition or proof of a shared secretion mechanism. No canonical taxon, exact synonym, xref or causal graph inferred. Ignored/hidden current-copy, retained-history and open/draft PR checks found no exact counterpart or competing allocation; decimal measurements, embedding coordinates and broad editor envelopes were adjudicated as false positives. Reserved local 000724, cohort v600 and full 1067700-1067799 block. Trait timestamp records observed acceptance; this history records later CREATE. All preexisting records including protected spore germination remain unchanged.

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