(Hallman et al., 1997) is a diverse group of bacteria, PGPR strains mainly in the genera Azospirillum, Azotobacter, Pseudomonas, Bacillus, Burkholderia, Serratia, and Gluconacetobacter PGPR groups etc.
(Hallman et al., 1997) PGPR is a group of bacterial species. Most of them belong to the genus Pseudomonas, Azospirillum, Azotobacter, Bacillus, Burkholderia, Gluconacetobacter and Serratia group as PGPR.
(Hallman et al, 1997) PGPR group of bacteria of species, most are the genus Pseudomonas Azospirillum Azotobacter,,,, ,, and Bacillus Burkholderia Gluconacetobacter Serratia etc. the PGPR.