plastid stroma

GO:0009532 · Membrane organelle · Subcellular region · Proposed

The ground substance of a plastid. [GO:0009532]

Synonyms: Plastidic stroma

Part of: plastid (GO:0009536)

Xrefs: uniprot.location:SL-0215 — Plastid stroma

Taxonomic distribution

NCBITaxon:2759 Eukaryota — RARE: Plastid stromal compartments occur in the scattered eukaryotic lineages that carry primary, secondary, or reduced plastids. [DOI:10.1098/rstb.2009.0103]
NCBITaxon:33090 Viridiplantae — COMMON: Green algae and land plants carry primary plastids with internal stromal matrix compartments. [DOI:10.1098/rstb.2009.0103]
NCBITaxon:3055 Chlamydomonas reinhardtii — COMMON: The Chlamydomonas reinhardtii chloroplast stroma contains metabolic and protein-biogenesis proteins in a unicellular green-algal model. [DOI:10.1007/s00294-011-0339-1]

NCBITaxon:3055 Chlamydomonas reinhardtii — Unicellular green-algal model whose chloroplast stroma has been profiled in plastid proteome surveys. [DOI:10.1007/s00294-011-0339-1]

The plastid stroma is the matrix-filled internal space inside a plastid.

Subject	Predicate	Object	Evidence
plastid	contains	plastid stroma	`GO:0009532` GO:0009532 identifies the plastid stroma as the ground substance of plastids. `uniprot.location:SL-0215` — Plastid stroma UniProt SL-0215 places Plastid stroma under the Plastid location.

INTERPRETATION (RESOLVED): Keep soluble enzymes and lineage-specific stromal inclusions out of the curated plastid stroma component list. GO:0009532 and UniProt SL-0215 identify the generic matrix space inside plastids. Exact inclusions such as chloroplast nucleoids and plastoglobules, as well as soluble stromal protein sets, belong on exact child records or future component-specific records rather than defining the generic stroma.

GO:0009532 Gene Ontology cellular-component term for plastid stroma.
GO:0009536 Gene Ontology cellular-component term for the containing plastid.
uniprot.location:SL-0215 — Plastid stroma UniProt Subcellular Location entry SL-0215 maps Plastid stroma to GO:0009532 and lists Plastid as its host parent.
DOI:10.1098/rstb.2009.0103 Keeling 2010, The endosymbiotic origin, diversification and fate of plastids, Philosophical Transactions of the Royal Society B.
DOI:10.1007/s00294-011-0339-1 Terashima, Specht and Hippler 2011, The chloroplast proteome: a survey from the Chlamydomonas reinhardtii perspective with a focus on distinctive features, Current Genetics.

2026-09-13T21:52:40Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-13T21:53:06Z codex · EXPANDED_RECORD — Added the UniProt SL-0215 xref and exact synonym, plastid parthood, Eukaryota, Viridiplantae, and Chlamydomonas scope, a nonmechanistic stroma topology graph, and a resolved interpretation for generic stromal contents.