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LBNL Brachypodium Drought SynCom15

Community ID CommunityMech:000088
Ecological State ENGINEERED
Environment rhizosphere
ENVO:00005801 · HabitatMech ↗

A stable 15-member Brachypodium rhizosphere SynCom constructed with network and cultivation-guided methods to promote drought resilience.

Taxonomy

Taxon Ontology ID Functional Roles Abundance
Brachypodium rhizobiome bacteria — ontology label: Bacteria NCBITaxon:2 · TaxonMech · TraitMech
CROSS_FEEDER
N/A
  • PMID:40862137 - SUPPORT (IN_VITRO)
    "Here, we present a systematic approach using a combination of network analysis and cultivation-guided methods to construct a 15-member SynCom from the rhizobiome of Brachypodium distachyon."

Ecological Interactions

The graph shows only explicitly linked interaction participants. Community members without an asserted participant link are omitted; membership alone does not imply an interaction.

Ecological interaction network for LBNL Brachypodium Drought SynCom15 Bipartite graph where circles represent taxa and non-circular symbols represent interactions. Rare or untyped interactions share the Other symbol; exact curated types remain in the interaction details.
Taxon
Other

Genomic Osmoprotectant and Ion-Transport Prediction

Genome annotations of individual members predict osmoprotectant and ion-transport potential, including trehalose/betaine-related genes. PARTIAL - gene presence does not establish expression, synthesis, secretion, transfer to Brachypodium or necessary mediation of drought recovery. This is member functional potential, not demonstrated interstrain cross-feeding.

Participating Taxa: Brachypodium rhizobiome bacteria

Metabolites: trehalose (CHEBI:27082 · MediaIngredientMech · CMMMech), glycine betaine (CHEBI:17750 · MediaIngredientMech · CMMMech)

Biological Processes:

Evidence

  • PMID:40862137 - PARTIAL (COMPUTATIONAL)
    "Genomic analysis of the individual strains was performed to reveal encoded plant growth-promoting traits"
  • PMID:40862137 - PARTIAL (COMPUTATIONAL)
    "genes for the synthesis of osmoprotectants (trehalose and betaine) and Na+/K+ transporters"

Member-Level PGP Phenotypes

Individual SynCom isolates showed positive results in selected plant-growth-promoting trait assays, including colorimetric and substrate-depletion readouts. These are member-level phenotypes, not direct community flux measurements. PARTIAL - their contribution to plant recovery, and the roles of specific metabolites or enzymes in planta, were not selectively established.

Participating Taxa: Brachypodium rhizobiome bacteria

Biological Processes:

Evidence

  • PMID:40862137 - SUPPORT (IN_VITRO)
    "some predicted traits were validated by laboratory phenotypic assays"

Host-Associated Persistence Compared With Liquid Culture

The 15-member inoculum showed more balanced 16S relative profiles with Brachypodium than in liquid culture. In the three-week weekly-transfer 0.2X MS experiment, six strains were undetectable or below 0.1% relative abundance; three taxa dominated. Plant experiments reported persistence of members, with unequal abundances. These sequencing observations do not establish equal stability of all 15 strains in vitro, absolute viable counts or reciprocal mutualism.

Participating Taxa: Brachypodium rhizobiome bacteria

Biological Processes:

Evidence

  • PMID:40862137 - SUPPORT (IN_VIVO)
    "After 3 weeks of growth in planta, the relative abundance of strains was more evenly distributed"
  • PMID:40862137 - SUPPORT (IN_VITRO)
    "six of the 15 strains were undetectable or had a relative abundance below 0.1% after 3 weeks"

Brachypodium Drought Recovery Promotion

SynCom-amended Brachypodium showed better shoot weight, shoot height, root length and leaf-number outcomes after drought followed by rewatering than unamended plants. The Results report no significant differences in these endpoints during sustained drought. PARTIAL - osmoprotectant and ion-transporter genes are proposed contributors, not selectively demonstrated causes of recovery.

Participating Taxa: Brachypodium rhizobiome bacteria

Biological Processes:

Evidence

  • PMID:40862137 - SUPPORT (IN_VIVO)
    "plants amended with the SynCom recovered better than those without"

Strain-Dependent Root Spatial Distribution

After 21 days, 16S profiles differed between root tips and bases in a strain- and condition-dependent manner. MA-N2 sp. RCC-150 showed root-tip enrichment under drought and salt stress; some other strains were instead enriched at the base. HYPOTHESIZED - exudate-guided recruitment and metabolite return could contribute, but isolate carbon-use assays and spatial relative abundance do not trace migration, exchange or selective mediation of recovery.

Participating Taxa: Brachypodium rhizobiome bacteria

Biological Processes:

Evidence

  • PMID:40862137 - PARTIAL (IN_VIVO)
    "preferential colonization of SynCom strains around root tips under stress"
  • PMID:40862137 - PARTIAL (IN_VIVO)
    "likely due to active interactions between plant root metabolites and bacteria"

Knowledge gaps & discussions (1)

KNOWLEDGE_GAP OPEN Which members and functions mediate the post-drought recovery benefit?

Remove two assembly/design-only graph nodes; those methodological facts remain in the unchanged design metadata. Preserve positive genomic potential, member assays, host-associated persistence, rewatering benefit and spatial observations. The broad abstract stability statement is qualified by the main Results: six strains were undetectable or below 0.1% after three weeks in vitro. Drought recovery and sustained drought are distinct. Root-exudate recruitment, osmoprotectant transfer and gene mediation remain hypotheses, without invented arrows. The canonical Bacteria entry is an aggregate placeholder, not a resolved 15-strain roster; #1548 tracks non-graph taxonomy/ingredient/protocol gaps. Original figure pixels, separate supplements and raw data were not audited.

Attaches to: ecological_interactions#Genomic Osmoprotectant and Ion-Transport Prediction, ecological_interactions#Member-Level PGP Phenotypes, ecological_interactions#Host-Associated Persistence Compared With Liquid Culture, ecological_interactions#Brachypodium Drought Recovery Promotion, ecological_interactions#Strain-Dependent Root Spatial Distribution

Environmental Factors

Factor Value Unit
defined synthetic community design Network analysis and cultivation-guided selection of 15 rhizobiome strains spanning five bacterial phyla. N/A
  • PMID:40862137 - SUPPORT (IN_VITRO)
    "Here, we present a systematic approach using a combination of network analysis and cultivation-guided methods to construct a 15-member SynCom from the rhizobiome of Brachypodium distachyon."

Growth Media

R2A (SynCom member cultivation); 0.2X MS for in-planta drought assay

Temperature 24 °C

Preparation notes: SynCom member isolates grown in R2A to log phase, then combined at equal cell numbers (4x10^7 cells each) and applied to Brachypodium distachyon in 0.2X Murashige and Skoog (MS) medium; plants held in a growth chamber at 24°C, 16-h light, 50% humidity. Strains were originally isolated on 1X R2A and RCH2 minimal media incubated at 30°C in the dark for 7 days.

Evidence

PMID:40862137

"Individual SynCom isolates were cultivated in R2A media for 24–72 h until they reached log phase"

PMID:40862137

"The mixture was incubated in a plant growth chamber with conditions set at 16-h light, 24°C temperature, and 50% humidity."

Cross-Mech Suite Links

Explore related entities across the CultureBotAI X-Mech knowledge bases:

HabitatMech: rhizosphere ↗ TaxonMech: Brachypodium rhizobiome bacteria ↗ TraitMech: Brachypodium rhizobiome bacteria ↗ CultureMech Growth Media ↗ PathwayMech Pathways ↗