A mutualistic marine diatom-bacteria association between Pseudo-nitzschia multiseries and Sulfitobacter sp. SA11, mediated by auxin and tryptophan signaling. The diatom produces tryptophan and taurine, which the bacterium uses to synthesize indole-3-acetic acid (IAA) auxin that promotes diatom growth. The bacterium also secretes ammonia as a nitrogen source. This interaction is widespread in ocean ecosystems and plays a significant role in carbon cycling and primary production.
Taxonomy
| Taxon | Ontology ID | Functional Roles | Abundance |
|---|---|---|---|
| Pseudo-nitzschia multiseries | NCBITaxon:37319 |
PRIMARY_PRODUCER
|
DOMINANT |
| Sulfitobacter sp. SA11 | NCBITaxon:1546519 |
SYNTROPHIC_PARTNER
|
ABUNDANT |
Ecological Interactions
Tryptophan Biosynthesis and Secretion
MUTUALISMSource Taxon: Pseudo-nitzschia multiseries
Metabolites: tryptophan (CHEBI:16828), taurine (CHEBI:15891)
Biological Processes:
- tryptophan biosynthetic process (GO:0000162)
- photosynthesis (GO:0015979)
Evidence
-
PMID:25278561 - SUPPORT (IN_VITRO)"Growth was observed at NaCl concentrations of 1-9%, pH 6-12 and 10-37 °C"
IAA Biosynthesis and Growth Promotion
MUTUALISMSource Taxon: Sulfitobacter sp. SA11
Metabolites: indole-3-acetic acid (CHEBI:16411), ammonia (CHEBI:16134), tryptophan (CHEBI:16828)
Biological Processes:
- indole-3-acetic acid biosynthetic process (GO:0009684)
- response to auxin (GO:0009733)
- interspecies interaction (GO:0044419)
Evidence
-
PMID:25278561 - SUPPORT (IN_VITRO)"16S rRNA gene sequence comparison showed that strain H3(T) was related most closely to Sulfitobacter donghicola DSW-25(T) (97.3% similarity) and levels of similarity with other species of the genus Sulfitobacter were 95.1-96.9%"
Environmental Factors
| Factor | Value | Unit |
|---|---|---|
| Auxin signaling | widespread | N/A |
| Nutrient exchange | bidirectional | N/A |
| Species-specificity | high | N/A |