TraitMech

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paedogamy

traitmech:000624 · CLASS · PROPOSED

A sexual-reproduction phenotype in which two gametes produced by division within a single gametangium fuse with each other.

Trait evidence (3)

  • DOI:10.1080/0269249X.2013.791344
    fusion of two gametes within a single gametangium

    Kaczmarska et al. (2013), p.271, section 5.2.1, contiguous definition phrase in the directly read author-posted full text at https://www.researchgate.net/publication/259079699_Proposals_for_a_terminology_for_diatom_sexual_reproduction_auxospores_and_resting_stages. Cytokinesis distinguishes gametes from the undivided-cell nuclear fusion of section 5.2.2. Section 5.2 treats both as automixis, not equivalent names. This is terminology synthesis, not independent experimental replication of its cited Neidium study. Actual diagrams were not visually inspected. Do not make meiosis-I cytokinesis or immediate gametic-nuclear fusion universal requirements.

  • DOI:10.3390/d14121133
    Afterwards, the protoplasts (gametes) fused to form a zygote (auxospore)

    Bagmet et al. (2022), Results 3.3, p.9, clause before the Figure 3J,K citation, checked in publisher XML and typeset PDF. Abstract, Methods 2.1-2.5, Results 3.3, Discussion 4.1 and Table S1 were read; actual Figure 3 and pp.8-9 were inspected. Four clones were active: VCA-7, VCA-48, VCA-49 and VCA-51; VCA-50 and VCA-52 showed no mating. The authors call this pedogamy. Preserve their apparently-qualified interpretation of earlier Figure 3G,H; do not infer tracked nuclear fusion from chloroplast images. Seasonal observations and unsuccessful salt stimulation are study-specific. Plastid rbcL comparisons do not establish absence of genomic recombination.

  • DOI:10.1007/s12223-008-0018-x
    The gametic nuclei fused after auxospore expansion had begun.

    Poulickova (2008), PMID:18500631, scientific abstract directly retrieved from Europe PMC and PubMed. Unpaired Neidium cf. ampliatum cells differentiated into gametangia and underwent pedogamy. The quoted timing cautions against conflating gamete fusion with immediate nuclear fusion. Full text, actual figures and strain provenance remain unread. Preserve cf.; no exact species mapping or canonical Neidium example is asserted.

Provenance

Identifier source
TraitMech local identifier
Definition source
DOI:10.1080/0269249X.2013.791344

Parent traits (1)

Synonyms (1)

  • pedogamy EXACT_SYNONYM · DOI:10.3390/d14121133

kg-microbe context

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

Canonical examples (1)

Organisms cited as exemplars of this trait. Taxon ids are NCBITaxon and link out to the NCBI record.

  • Nitzschia acidoclinata NCBITaxon:1302829 DOI:10.3390/d14121133 Qualified VCA-7 example, one of the four sexually active clones in Results 3.3, not every tested clone. Table S1 traces VCA-7 to wet ground in Gonduras Cave, Krasnoyarsk Territory, collected 2011-02-19; Methods 2.1 describes single-cell isolation and subsequent culture. Provenance table directly inspected in https://mdpi-res.com/d_attachment/diversity/diversity-14-01133/article_deploy/diversity-14-01133-s001.zip. NCBI https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?id=1302829 and taxonomy EFetch checked on 2026-10-05 resolve this species name; this does not authenticate a genome or current culture accession.

Discussions and Knowledge Gaps (2)

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

Separate gamete-cell fusion from autogamy and broader selfing.

CURATION TODO OPEN paedogamy-scope-and-hierarchy · raised by codex · 2026-10-05

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.

Use the single-gametangium gamete-fusion sense established in the cited diatom literature. Autogamy traitmech:000622 denotes gametic-nuclear fusion in an unpaired undivided cell, without fusion of separate gametes; cytogamy traitmech:000623 concerns paired cells without nuclear exchange. Automixis is broader in Kaczmarska et al. section 5.2 and is not an exact synonym. Bagmet et al. calls automixis homothallic, whereas our existing homothallism traitmech:000609 is fungal-scoped; this usage does not make that record a parent. The parent gap is resolved by automixis traitmech:000625, whose single-meiotic-cell nuclear origin includes this operational scope. The broader terminology and mapping questions keep this discussion OPEN. Do not infer species-level disjointness or universal homozygosity, recombination rate, seasonal trigger or inability to outcross. Broader non-diatom usage and external equivalences need primary source review before expanding this operational scope.

Resolve nuclear cytology and molecular mechanisms beyond morphology.

KNOWLEDGE GAP OPEN paedogamy-mechanism-and-coverage · raised by codex · 2026-10-05

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 reproductive phenotype, not a literal locus or a plastid-marker sequence feature. The directly inspected microscopy supports a gamete-fusion interpretation but does not identify a protein-resolved causal pathway. No causal graph or accession-level protein claim is inferred from chloroplast shape, sequence similarity or terminology. Full Neidium methods and provenance, and stronger nuclear observations in the Nitzschia system, remain coverage gaps. Retain actual snippet-resolver outcomes separately from direct PDF, XML and abstract checks.

Curation history

  1. · MINTED_TRAITMECH_ID · codex

    Added paedogamy with three DOI-backed snippets, a pedogamy spelling synonym and qualified natural VCA-7 example. Ignored-and-hidden novelty/allocation searches found no exact record or collision. Reserved METPO:1057700 in v500. Distinguished gamete fusion from autogamy and broader automixis; deferred molecular graphs and mappings.

  2. · RESOLVED_PARENT_GAP · codex

    Reparented below automixis traitmech:000625 and documented the resolved parent gap while retaining other open terminology and mapping questions. Preserved definition, evidence, examples and prior history. v501 carries the existing proposed METPO ID with this hierarchy; earlier standalone templates remain historical.