Plant growth promoting characters of gluconacetobacter diazotrophicus azospirillum brasilense and phosphobacteria (bacillus megaterium)

PGPB – Plant Growth Promoting Bacteria are the group of beneficial bacteria promote crop growth and yield by exerting many beneficial aspects like N fixation, P solubilization, growth promoting substances production and siderophore production. In the present research about 13 isolates were isolated and identified as Azospirillum brasilense, Gluconacetobacter diazotrophicus and phosphobacteria (Bacillus megaterium) and these isolates were studied for its PGPB nature to provide N & P nutrients and biocontrol nature through siderophore production. The findings of the present investigation clearly showed the interesting future of tested organisms. Gluconacetobacter diazotrophicus showed maximum efficiency on N fixation and P solubilization, Azospirillum showed efficiency and recorded maximum value for IAA synthesis and phosphobacteria (Bacillus megaterium) recorded significant value in siderophore production. Based on the present findings while inoculating these organisms to the crop plants, it is better to inoculate all three PGPB in the form of consortium for better results and further efficiency of these organisms must be exploited on crop plants in environmental conditions.