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Drought-Induced Rhizosphere Iron-Enriched Actinobacteria Community

Community ID CommunityMech:000235
Ecological State PERTURBED
Environment drought-stressed root rhizosphere
ENVO:00002233

A root-associated rhizosphere microbial community in which drought stress drives reproducible enrichment of bacterial lineages whose iron transport and metabolism functionalities are overrepresented. Genome-resolved metagenomics and comparative genomics show carbohydrate and secondary- metabolite transport functions also dominate drought-enriched taxa. Time- series root RNA-Seq data show that root iron homeostasis is impacted by drought, and loss of a plant phytosiderophore iron transporter increases Actinobacteria abundance. Exogenous iron application disrupts the drought- induced Actinobacteria enrichment and removes their host phenotype improvement, implicating iron metabolism as a microbiome-drought axis.

Taxonomy

Taxon Ontology ID Functional Roles Abundance
drought-enriched rhizosphere Actinobacteria NCBITaxon:201174
PRIMARY_DEGRADER CROSS_FEEDER
N/A
  • PMID:34050180 - SUPPORT (IN_VIVO)
    "leading to significant increases in the drought-enriched lineage, Actinobacteria"

Ecological Interactions

Ecological interaction network for Drought-Induced Rhizosphere Iron-Enriched Actinobacteria Community Bipartite graph where circle nodes represent taxa and colored rectangles represent ecological interactions (cross-feeding, mutualism, syntrophy, competition, commensalism).
Taxon
Cross-feeding
Mutualism
Syntrophy
Competition
Commensalism
Niche partitioning
Colonization facilitation
Strain competition
Predation

Drought Selection on Iron- and Carbohydrate-Transport Functions

NICHE_PARTITIONING

Metabolites: iron (CHEBI:24875)

Biological Processes:

Evidence

  • PMID:34050180 - SUPPORT (IN_VIVO)
    "bacterial iron transport and metabolism functionality is highly correlated with drought enrichment"
  • PMID:34050180 - SUPPORT (IN_VIVO)
    "carbohydrate and secondary metabolite transport functionalities are overrepresented within drought-enriched taxa"

Plant Phytosiderophore Transporter Loss Promotes Actinobacteria

COLONIZATION_FACILITATION

Evidence

  • PMID:34050180 - SUPPORT (IN_VIVO)
    "loss of a plant phytosiderophore iron transporter impacts microbial community composition"

Exogenous Iron Disrupts Drought-Induced Actinobacteria

COMPETITION

Metabolites: iron (CHEBI:24875)

Evidence

  • PMID:34050180 - SUPPORT (IN_VIVO)
    "exogenous application of iron disrupts the drought-induced enrichment of Actinobacteria, as well as their improvement in host phenotype during drought stress"

External Resources

Name Repository Resource ID
Primary publication for the drought rhizosphere iron community
PubMed record for the Xu et al. 2021 Nature Communications paper on iron metabolism in drought-induced rhizosphere microbiome dynamics. 		OTHER PMID:34050180
  • PMID:34050180 - SUPPORT (IN_VIVO)
    "iron metabolism in the root microbiome's response to drought"
DOI landing page
DOI link to the Nature Communications paper. 		OTHER doi:10.1038/s41467-021-23553-7

Environmental Factors

Factor Value Unit
Drought stress drought versus well-watered conditions N/A
  • PMID:34050180 - SUPPORT (IN_VIVO)
    "drought leads to dramatic, highly conserved shifts in the root microbiome"
Plant phytosiderophore transporter genotype phytosiderophore-transporter mutant versus wild type N/A
  • PMID:34050180 - SUPPORT (IN_VIVO)
    "iron homeostasis within the root is impacted by drought stress"
Iron amendment exogenous iron application N/A
  • PMID:34050180 - SUPPORT (IN_VIVO)
    "exogenous application of iron disrupts the drought-induced enrichment of Actinobacteria"