Fig 3. Qualitative representation of plant growth-promoting traits observed for diazotrophic/N-scavenging bacteria isolated from different sources and from soils under different management conditions.

(A) Venn diagram showing unique and shared plant growth-promoting (PGP) traits detected for the bacterial strains studied. (B) Quantitative distribution of bacterial strains according to isolation source and PGP traits. (C) Quantitative distribution of bacterial strains according to phylogenetic position at the genus level and PGP traits.