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Maize Benzoxazinoid-Metabolizing SynComs

Community ID CommunityMech:000101
Ecological State ENGINEERED
Environment rhizosphere
ENVO:00005801 · HabitatMech ↗

Two maize root bacterial SynComs sharing six common strains and differing in a seventh benzoxazinoid-metabolizing member.

Taxonomy

Taxon Ontology ID Functional Roles Abundance
maize root bacteria — ontology label: Bacteria NCBITaxon:2 · TaxonMech · TraitMech
CROSS_FEEDER
N/A
  • PMID:40853002 - SUPPORT (IN_VITRO)
    "we designed two synthetic communities of maize root bacteria that share six common strains and differ in their ability to metabolize benzoxazinoids based on the seventh strain."

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 Maize Benzoxazinoid-Metabolizing SynComs 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

Community-Dependent MBOA Redirection

The seven-member metabolizing metSC formed predominantly HMPAA from MBOA, unlike LMB2 monoculture, which mainly formed AMPO. Removing Microbacterium LMB2 abolished marked MBOA degradation; removing any other single member still allowed HMPAA formation. LMB2 paired with five of six partners produced some HMPAA, with Bacillus LBA21 the exception. These perturbations support community-dependent conversion, not a unique required second partner or niche partitioning. Triplicate cultures were pooled for the principal metabolite profiles (n=1), and unstable intermediates, AMPO precipitation and unmeasured products preclude quantitative flux or carbon balance. A separate replicated five-hour LMB2 assay detected extracellular AMP, supporting intermediate availability, but BxdA localization, transport and partner acetylase identity remain unresolved. The canonical Bacteria entry is a roster placeholder, not a resolved strain.

Participating Taxa: maize root bacteria

Metabolites: MBOA (6-methoxybenzoxazolin-2(3H)-one) (CHEBI:195240 · MediaIngredientMech · CMMMech)

Biological Processes:

Downstream Effects:
→ MBOA-Enhanced Metabolizing SynCom Performance

PARTIAL - MBOA degradation could relieve antimicrobial inhibition and thereby support metSC performance, as proposed by the authors. The specific HMPAA redirection route was not selectively separated from degradation, HMPAA toxicity was not tested, and rich-medium detoxification is distinct from bulk growth in sole-carbon-source assays. This does not establish growth benefit to every member.

Evidence

  • PMID:40853002 - SUPPORT (IN_VITRO)
    "we designed two synthetic communities of maize root bacteria that share six common strains and differ in their ability to metabolize benzoxazinoids based on the seventh strain."
  • PMID:40853002 - SUPPORT (IN_VITRO)
    "However, the metSC formed HMPAA rather than AMPO"

MBOA-Tolerant Strain Enrichment

MBOA changed relative 16S community composition in separate complex-medium flask experiments at 500 and 2500 uM. Some tolerant members increased in fraction, but susceptible Chitinophaga LMN1 also increased, and Stenotrophomonas LST17 declined less in metSC than nonSC. Copy-number-adjusted relative profiles cannot resolve absolute growth of each member, and extraction bias may underrepresent Gram-positive inputs. This is not universal enrichment by tolerance, a measured niche-partitioning mechanism or independently established mediation of total growth. The single canonical bacterial placeholder does not identify the full roster.

Participating Taxa: maize root bacteria

Metabolites: MBOA (6-methoxybenzoxazolin-2(3H)-one) (CHEBI:195240 · MediaIngredientMech · CMMMech)

Biological Processes:

Evidence

  • PMID:40853002 - PARTIAL (IN_VITRO)
    "MBOA shaped the differential compositions of both communities and increased the fraction of MBOA-tolerant strains."

MBOA-Enhanced Metabolizing SynCom Performance

The metSC showed greater bulk growth than the alternate nonSC in the presence of MBOA. In separate minimal-medium assays it could grow with MBOA as the sole supplied carbon source, but bulk OD does not distinguish LMB2-only growth from use by other members. In complex medium, OD and total CFU supported higher metSC performance, while growth of both SynComs declined as MBOA increased. The authors interpret this mainly as detoxification in rich medium, not proof of HMPAA-specific protection, mutual benefit to all strains or enhanced maize performance in soil. The six shared strains and alternate seventh member are not resolved by the canonical Bacteria placeholder.

Participating Taxa: maize root bacteria

Metabolites: MBOA (6-methoxybenzoxazolin-2(3H)-one) (CHEBI:195240 · MediaIngredientMech · CMMMech)

Biological Processes:

Evidence

  • PMID:40853002 - PARTIAL (IN_VITRO)
    "bacterial interaction results in alternative benzoxazinoid metabolization and increases community performance in the presence of these antimicrobial compounds."

Knowledge gaps & discussions (1)

KNOWLEDGE_GAP OPEN Which steps of MBOA conversion mediate the metSC growth advantage?

Retain the experimentally supported conversion and bulk performance, with a PARTIAL existing arrow. Resolve extracellular intermediate supply, enzyme localization, partner acetylation, HMPAA toxicity and member-specific carbon use before asserting an exact detoxification pathway or universal cross-feeding benefit. Relative composition changes alone do not establish mediation of the performance endpoint; remove that arrow. No new nodes/arrows added. #1580 tracks unresolved canonical rosters and assay-specific metadata. Complete primary main text/captions read, not separate supplements, figure pixels or raw data.

Attaches to: ecological_interactions#Community-Dependent MBOA Redirection, ecological_interactions#MBOA-Tolerant Strain Enrichment, ecological_interactions#MBOA-Enhanced Metabolizing SynCom Performance

Environmental Factors

Factor Value Unit
defined synthetic community design Two seven-strain synthetic communities of maize root bacteria with shared core strains and alternate benzoxazinoid-metabolizing capacity. N/A
  • PMID:40853002 - SUPPORT (IN_VITRO)
    "we designed two synthetic communities of maize root bacteria that share six common strains and differ in their ability to metabolize benzoxazinoids based on the seventh strain."

Growth Media

50% TSB (tryptic soy broth, 15 g/L)

Temperature 28 °C

Preparation notes: Strains routinely grown on 100% TSA plates or in liquid 50% TSB; SynComs grown in 96-well plates in 50% TSB supplemented with 500 µM MBOA for 68 h; precultures grown to stationary phase over 4 days at 28°C, 180 rpm; community-structure assays used Erlenmeyer flasks; parallel minimal-medium assays used MBOA (500 or 2,500 µM) or glucose as the sole carbon source.

Evidence

PMID:40853002

"MRB collection, 8 ) were routinely grown on solid 100% TSA plates (30 g/L tryptic soy broth and 15 g/L of agar, both Sigma-Aldrich) or in liquid 50% TSB medium (15 g/L tryptic soy broth) with 180 rpm shaking at 25–28°C."

PMID:40853002

"Pre-culture plates were covered with a Breathe-Easy membrane (Diversified Biotech, Dedham, USA) and grown until stationary phase for 4 days at 28°C and 180 rpm."

Cross-Mech Suite Links

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

HabitatMech: rhizosphere ↗ TaxonMech: maize root bacteria ↗ TraitMech: maize root bacteria ↗ CultureMech Growth Media ↗ PathwayMech Pathways ↗