A simplified synthetic rhizosphere community (SRC1-subset) derived from the larger SRC1 consortium for enhancing sorghum bioenergy crop productivity. The subset consists of 16-20 bacterial strains selected from the full 57-strain SRC1 community, including multiple Pseudomonas, Bacillus, and Arthrobacter strains. This engineered community was designed using network analysis to identify hub taxa and strains capable of utilizing sorghum-specific root exudate compounds. Field-tested studies demonstrate that the community effectively colonizes sorghum rhizosphere and roots, leading to increased shoot biomass and improved yield performance under field conditions. The growth enhancement correlates with transcriptional dampening of lignin biosynthesis in the host plant.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
|---|---|---|---|
| Pseudomonas sp. | NCBITaxon:306 |
SYNTROPHIC_PARTNER
|
ABUNDANT |
| Bacillus sp. | NCBITaxon:1386 |
SYNTROPHIC_PARTNER
|
ABUNDANT |
| Arthrobacter sp. | NCBITaxon:1667 |
SYNTROPHIC_PARTNER
|
ABUNDANT |
| Streptomyces ambofaciens | NCBITaxon:1889 |
SYNTROPHIC_PARTNER
|
COMMON |
| Paenibacillus lautus | NCBITaxon:1401 |
SYNTROPHIC_PARTNER
|
COMMON |
| Pseudomonas pudica | NCBITaxon:272772 |
SYNTROPHIC_PARTNER
|
COMMON |
| Sorghum bicolor | NCBITaxon:4558 |
PRIMARY_PRODUCER
|
N/A |
Ecological Interactions
Rhizosphere Colonization and Root Association
MUTUALISMSource Taxon: Pseudomonas sp.
Target Taxon: Sorghum bicolor
Biological Processes:
- symbiotic process (GO:0044403)
- root colonization (GO:0044409)
Evidence
-
doi:10.1093/ismejo/wrae126 - SUPPORT (IN_VIVO)"Here, we engineered a synthetic rhizosphere community (SRC1) with the anticipation that it would exhibit a selective advantage in colonizing the host Sorghum bicolor, thereby potentially fostering its growth"
Plant Growth Promotion and Biomass Enhancement
MUTUALISMSource Taxon: Bacillus sp.
Target Taxon: Sorghum bicolor
Biological Processes:
- plant growth (GO:0040007)
- regulation of cell wall biogenesis (GO:1903338)
Evidence
-
doi:10.1093/ismejo/wrae126 - SUPPORT (IN_VIVO)"We establish that SRC1 effectively promotes the growth of both above- and below-ground plant phenotypes in both laboratory and native field contexts"
Lignin Biosynthesis Regulation
MUTUALISMSource Taxon: Arthrobacter sp.
Target Taxon: Sorghum bicolor
Biological Processes:
- lignin biosynthetic process (GO:0009809)
- regulation of secondary metabolite biosynthetic process (GO:1900376)
Evidence
-
doi:10.1093/ismejo/wrae126 - SUPPORT (IN_VIVO)"Furthermore, in laboratory conditions, these growth enhancements correlate with the transcriptional dampening of lignin biosynthesis in the host"
Secondary Metabolite Production
MUTUALISMSource Taxon: Streptomyces ambofaciens
Target Taxon: Sorghum bicolor
Biological Processes:
- plant-bacterium mutualism (GO:0044403)
Evidence
-
doi:10.1093/ismejo/wrae126 - SUPPORT (IN_VIVO)"SRC1 was assembled from bacterial isolates identified either for their potential role in community cohesion through network analysis or for their ability to benefit from host-specific exudate compounds"
Rhizosphere Nutrient Mobilization
MUTUALISMSource Taxon: Paenibacillus lautus
Target Taxon: Sorghum bicolor
Biological Processes:
- plant-bacterium mutualism (GO:0044403)
Evidence
-
doi:10.1093/ismejo/wrae126 - SUPPORT (IN_VIVO)"SRC1 was assembled from bacterial isolates identified either for their potential role in community cohesion through network analysis or for their ability to benefit from host-specific exudate compounds"
Exudate Utilization and Root Colonization
MUTUALISMSource Taxon: Pseudomonas pudica
Target Taxon: Sorghum bicolor
Biological Processes:
- plant-bacterium mutualism (GO:0044403)
Evidence
-
doi:10.1093/ismejo/wrae126 - SUPPORT (IN_VIVO)"SRC1 was assembled from bacterial isolates identified either for their potential role in community cohesion through network analysis or for their ability to benefit from host-specific exudate compounds"
Environmental Factors
| Factor | Value | Unit |
|---|---|---|
| Community design strategy | network-based and exudate-responsive selection | N/A |
| Community size | 16-20 member subset from 57-strain parent consortium | N/A |
| Field testing | validated in native field conditions | N/A |
| Biomass enhancement | increased shoot fresh and dry weight | N/A |
| Bioenergy crop application | sorghum productivity improvement | N/A |
| Inoculation method | 1 mg/mL biomass per strain | N/A |