What does the published scientific research say about Bacillus azotofixans?

Seven PubMed articles index Bacillus azotofixans — classified today as Paenibacillus azotofixans, with Paenibacillus durum listed as a synonym — in plant-input contexts. It is a nitrogen-fixing, endospore-forming rhizosphere bacterium documented in the root zones of maize, wheat, and other grasses across multiple countries.

Research has characterized the nifH (dinitrogenase reductase) gene across multiple P. azotofixans strains, identifying two sequence clusters and evidence that nifH is likely a multicopy gene. Nitrogen fixation has been confirmed by acetylene-reduction assays. Brazilian rhizosphere population studies show that strain diversity shifts across plant-growth stages and differs statistically between soil types, suggesting meaningful ecological variation within the species.

One study also identified a cyclodextrin glycosyltransferase from P. azotofixans YUPP-5 capable of hydrolyzing β-1,4-linked polysaccharides — glucomannan, xylan, and carboxymethyl cellulose — described in the literature as a novel enzymatic function for this organism.