HabitatMech

leaf

PO:0025034 ·resolve ·HOST_ASSOCIATED ·EXACT SEEDED

A phyllome (PO:0006001) that is not associated with a reproductive structure. — PO

SEEDED workflow status. The source-seeding rules supplied this record; consult its curation history for later attributed changes. This status does not establish human review.

Source attestations

Each upstream vocabulary's own account of this habitat. Assertion counts are per-source units and are not comparable across sources — GOLD counts organisms, BacDive strains, PREGO taxa.

What each upstream vocabulary says about this habitat
SourceLabel / pathAssertionsUnit
BACDIVE Leaf-Phyllosphere
kg-microbe's isolation-source mapping table has a row for this source with no ontology target; treated as ungrounded rather than re-grounded by lexical match.		 500 STRAIN
ENVIRONMENTS_TABLE host_plant_leaf-associated
Physicochemical parameter bands from kg-microbe's environment table.		 —
GOLD Host-associated > Plants > Phyllosphere > Phylloplane/Leaf surface
2 GOLD ecosystem node ids share this path; first shown. See data/raw/gold_ecosystem_paths.tsv.		 843 ORGANISM
GOLD Host-associated > Plants > Phyllosphere > Phylloplane/Leaf
2 GOLD ecosystem node ids share this path; first shown. See data/raw/gold_ecosystem_paths.tsv.		 1448 ORGANISM
MADIN leaf 77 TAXON

Broader habitats

Environmental parameters

Physicochemical parameters
ParameterValueSource
GRADIENTShighkg-microbe environments.csv (host_plant_leaf-associated)
PHmediumkg-microbe environments.csv (host_plant_leaf-associated)
PRESSURElowkg-microbe environments.csv (host_plant_leaf-associated)
SALINITY_VARIABILITYsmallkg-microbe environments.csv (host_plant_leaf-associated)
TEMPERATURE_VARIABILITYhighkg-microbe environments.csv (host_plant_leaf-associated)

Causal graphs

Leaf phyllosphere water-nutrient stress

Leaf surfaces expose epiphytic bacteria to fluctuating water, nutrient, and ultraviolet stresses while local water films and leached plant sugars create microsites that support aggregate-forming phyllosphere taxa.

Directed graph · arrows run from subject to object. Focus or hover over a node or arrow for details; the evidence table follows.
Leaf phyllosphere water-nutrient stress 14 nodes and 11 directed relationships. Labels and evidence are also available in the adjacent table. leaf — provides → phyllosphere surface; Evidence: PMID:23154261 provides phyllosphere surface — has condition → fluctuating water and nutrients; Evidence: PMID:12676659 has condition fluctuating water and nutrients — controls → cuticular sugar flux; Evidence: PMID:24124501 controls cuticular sugar flux — creates → nutrient hotspots; Evidence: PMID:24124501 creates nutrient hotspots — promotes → epiphytic bacterial aggregates; Evidence: PMID:14665692 promotes epiphytic bacterial aggregates — produces → extracellular polysaccharide; Evidence: PMID:12676659 produces extracellular polysaccharide — mitigates → desiccation stress; Evidence: PMID:12676659 mitigates phyllosphere surface — exposes microbes to → solar UVA exposure; Evidence: PMID:28068611 exposes microbes to Methylobacterium species — has adaptation → UVA-absorbing compounds; Evidence: PMID:28068611 has adaptation Methylobacterium species — has adaptation → methanol utilization; Evidence: PMID:19805315 has adaptation Sphingomonas species — has adaptation → carbohydrate transport; Evidence: PMID:19805315 has adaptation leaf (HABITAT); leaf; PO:0025034 HABITAT leaf phyllosphere surface (HABITAT); phyllosphere_surface HABITAT phyllosphere surface fluctuating water and nutrients (ENVIRONMENTAL_PARAMETER); fluctuating_water_nutrients ENVIRONMENTAL_PARAMETER fluctuating water and nutrients cuticular sugar flux (BIOLOGICAL_PROCESS); cuticular_sugar_flux BIOLOGICAL_PROCESS cuticular sugar flux nutrient hotspots (STATE); nutrient_hotspots STATE nutrient hotspots epiphytic bacterial aggregates (COMMUNITY_PROCESS); epiphytic_bacterial_aggregates COMMUNITY_PROCESS epiphytic bacterial aggregates extracellular polysaccharide (CHEMICAL); extracellular_polysaccharide CHEMICAL extracellular polysaccharide desiccation stress (ENVIRONMENTAL_PARAMETER); desiccation_stress ENVIRONMENTAL_PARAMETER desiccation stress solar UVA exposure (ENVIRONMENTAL_PARAMETER); solar_uva_exposure ENVIRONMENTAL_PARAMETER solar UVA exposure Methylobacterium species (TAXON); methylobacterium_species TAXON Methylobacterium species UVA-absorbing compounds (CHEMICAL); uva_absorbing_compounds CHEMICAL UVA-absorbing compounds Sphingomonas species (TAXON); sphingomonas_species TAXON Sphingomonas species carbohydrate transport (BIOLOGICAL_PROCESS); carbohydrate_transport BIOLOGICAL_PROCESS carbohydrate transport methanol utilization (TRAIT); methanol_utilization TRAIT methanol utilization
leaf_phyllosphere_water_nutrient_stress edges
EdgeSubjectPredicateObjectEvidence
leaf_provides_phyllosphere_surface leaf provides
Leaf surfaces are phyllosphere habitats colonized by diverse bacterial communities.		 phyllosphere surface PMID:23154261
Vorholt reviewed cultivation-independent evidence that plant factors shape phyllosphere communities.
phyllosphere_imposes_water_nutrient_fluctuation phyllosphere surface has condition
The exposed leaf surface creates rapid physical and nutritional fluctuations for bacterial colonists.		 fluctuating water and nutrients PMID:12676659
Lindow and Brandl summarize fluctuation in physical and nutritional conditions as characteristic of the phyllosphere.
surface_water_controls_sugar_flux fluctuating water and nutrients controls
Surface-water distribution controls diffusion of leaf-derived sugars through the cuticle to epiphytic bacteria.		 cuticular sugar flux PMID:24124501
van der Wal and colleagues modeled how surface-water layouts change nutrient diffusion from the leaf interior to the surface.
sugar_flux_forms_nutrient_hotspots cuticular sugar flux creates
Water films and droplets concentrate leaked leaf sugars into spatially heterogeneous bacterial growth sites.		 nutrient hotspots PMID:24124501
van der Wal and colleagues linked water droplets, cuticle geometry, and bacterial consumption to sugar availability on the leaf surface.
nutrient_hotspots_form_aggregates nutrient hotspots promotes
Conductive nutrient microsites on leaf surfaces promote local bacterial reproduction and aggregate formation.		 epiphytic bacterial aggregates PMID:14665692
Monier and Lindow experimentally connected survival differences between solitary and aggregated cells with aggregate formation on leaf surfaces.
aggregates_accumulate_eps epiphytic bacterial aggregates produces
Epiphytic aggregates contain extracellular polysaccharide matrix material.		 extracellular polysaccharide PMID:12676659
Lindow and Brandl describe extracellular polysaccharide as a major part of the bacterial aggregate matrix in the phyllosphere.
eps_buffers_desiccation extracellular polysaccharide mitigates
Extracellular polysaccharide in aggregates buffers cells against the matric and osmotic stress of drying leaf surfaces.		 desiccation stress PMID:12676659
Lindow and Brandl report that EPS-rich aggregates can shield phyllosphere epiphytes from desiccation stress.
phyllosphere_exposes_cells_to_uva phyllosphere surface exposes microbes to
Phyllosphere microbes encounter harmful ultraviolet radiation on exposed leaf surfaces.		 solar UVA exposure PMID:28068611
Yoshida and colleagues screened phyllosphere isolates for ultraviolet-A absorbers.
methylobacterium_uses_uva_absorbers Methylobacterium species has adaptation
Leaf-associated Methylobacterium strains can contain stable, polar UVA-absorbing compounds.		 UVA-absorbing compounds PMID:28068611
Yoshida and colleagues found that the tested UVA-absorbing phyllosphere isolates belonged to Methylobacterium.
methylobacterium_uses_methanol Methylobacterium species has adaptation
Methylobacterium on leaves express proteins for using methanol as a carbon and energy source.		 methanol utilization PMID:19805315
Delmotte and colleagues detected Methylobacterium proteins related to methanol utilization in metaproteogenomic leaf samples.
sphingomonas_uses_carbohydrate_transport Sphingomonas species has adaptation
Leaf-associated Sphingomonas express TonB-dependent receptors consistent with broad carbohydrate transport.		 carbohydrate transport PMID:19805315
Delmotte and colleagues observed high expression of TonB-dependent receptors for Sphingomonas in phyllosphere communities.

Associated taxa

Taxa reported from this habitat, which is weaker than being characteristic of it. rank is out of pool: a high rank in a pool of thousands of near-tied scores is a weak claim. Entries corroborated by a second, independent source are listed first.

Taxa reported from this habitat
TaxonSourceRankPoolCorroborated
Methylobacterium sp. NCBITaxon:409 BACDIVE 1 231
Sphingomonas sp. NCBITaxon:28214 BACDIVE 2 231
Rhizobium sp. NCBITaxon:391 BACDIVE 3 231
Corallococcus coralloides NCBITaxon:184914 BACDIVE 4 231
Xanthomonas campestris NCBITaxon:339 BACDIVE 5 231
Pseudomonas syringae NCBITaxon:317 BACDIVE 6 231
Microbacterium sp. NCBITaxon:51671 BACDIVE 7 231
Pseudomonas sp. NCBITaxon:306 BACDIVE 8 231
Myxococcus fulvus NCBITaxon:33 BACDIVE 9 231
Frigoribacterium sp. NCBITaxon:1880915 BACDIVE 10 231
Nannocystis exedens NCBITaxon:54 BACDIVE 11 231
Paracidovorax anthurii NCBITaxon:78229 BACDIVE 12 231
Pedobacter sp. NCBITaxon:1411316 BACDIVE 13 231
Acidovorax sp. NCBITaxon:1872122 BACDIVE 14 231
Arthrobacter sp. NCBITaxon:1667 BACDIVE 15 231
Chryseobacterium sp. NCBITaxon:1871047 BACDIVE 16 231
uncultured Rhodococcus sp. NCBITaxon:194249 BACDIVE 17 231
Paracidovorax avenae NCBITaxon:80867 BACDIVE 18 231
Aeromicrobium sp. NCBITaxon:1871063 BACDIVE 19 231
Rathayibacter sp. NCBITaxon:1891630 BACDIVE 20 231
Myxococcus xanthus NCBITaxon:34 BACDIVE 21 231
Pectobacterium carotovorum NCBITaxon:554 BACDIVE 22 231
Agreia sp. NCBITaxon:1872416 BACDIVE 23 231
Aurantimonas sp. NCBITaxon:1872654 BACDIVE 24 231
Pantoea cypripedii NCBITaxon:55209 BACDIVE 25 231

Showing 25 of 50 kept associations.

Also called

Curation

What a curator decided about this record, and why. A record built from several source concepts can carry one decision per concept.

  1. GROUND 2026-08-12 · claude-opus-5

    Grounded to PO:0025034 'leaf' (BROAD). BacDive's leaf/phyllosphere isolation source. BTO:0000713 leaf is broader than the phyllosphere proper (which is the surface), so BROAD rather than EXACT. Merges with the GOLD phylloplane paths. Re-grounded from BTO:0000713 to PO:0025034 now that PO is vendored (#10). (source concept habitatmech:BACDIVE.5aa4da6419)

  2. GROUND 2026-08-12 · claude-opus-5

    Grounded to PO:0025034 'leaf' (BROAD). Phylloplane/leaf surface. BTO:0000713 leaf is broader than the leaf surface proper. Merges with the sibling Phylloplane/Leaf path, which GOLD splits without a clear distinction. Re-grounded from BTO:0000713 to PO:0025034 now that PO is vendored (#10). (source concept habitatmech:GOLD.19a1ce7868)

  3. GROUND 2026-08-12 · claude-opus-5

    Grounded to PO:0025034 'leaf' (BROAD). Phylloplane/leaf. BTO:0000713 leaf is broader than the phyllosphere proper, which is the surface layer. Re-grounded from BTO:0000713 to PO:0025034 now that PO is vendored (#10). (source concept habitatmech:GOLD.8e9f10356e)

  4. ADD_CAUSAL_GRAPH 2026-09-04 · codex

    Added a leaf phyllosphere water-nutrient-stress graph backed by PMID:23154261, PMID:12676659, PMID:24124501, PMID:14665692, PMID:28068611, and PMID:19805315.

Provenance

Generated by scripts/seed_from_sources.py from the committed inventories in data/raw/. View the record.