What does the published scientific research say about Rhodopseudomonas sphaeroides?

Rhodopseudomonas sphaeroides — also published as Rhodobacter sphaeroides, Cereibacter sphaeroides, and Luteovulum sphaeroides — appears in 8 PubMed records in plant-input contexts. It belongs to the purple non-sulfur bacteria (PNSB), a phototrophic group studied for agricultural biostimulation and environmental biotechnology.

Peer-reviewed research on Cereibacter sphaeroides PW15 (PMID 40705108) reported phosphate solubilization, nitrogen fixation confirmed by the nifH gene, and production of indole-3-acetic acid, siderophores, and 5-aminolevulinic acid, with measurable root and shoot growth enhancement in Arabidopsis thaliana. A separate study (PMID 35456821) found that R. sphaeroides lipopolysaccharide at 10–100 pg mL⁻¹ significantly promoted Brassica rapa growth — the first published report identifying LPS as an active plant-growth-promoting principle in PNSB.