Plant growth promoting bacteria (PGPB) are beneficial bacteria that can improve the extent or quality of plant growth via wide variety of mechanisms.To look for efficient PGPB strains having multiple activities, total eight bacterial isolates were isolated from rhizosphere and endosphere of cucumber in Iran. Eight isolates of PGPB designated as Pseudomonas protegens strain BASU390, Acinetobacter calcoaceticus strain BASU624, Brevibacillus formosus strain BASU625, Paenibacillus peoriae strain BASU645, Arthrobacter phenanthrenivorans strain BASU589, Pseudomonas protegens strain BASU 630, Pseudomonas putida strain BASU 205 and Stenotrophomonas pavanii strain BASU553 were successfully isolated and characterized through phenotypical traits and 16S rDNA gene sequencing.The bacterial isolates were subjected for different plant growth promotion activities. Subsequently, to investigate the effects of the bacterial isolates on the growth of cucumber a pot culture experiment was conducted.All of the isolates demonstrated remarkable plant growth promotion activities. Furthermore, most of isolates resulted in a significant increase in plant height, root length, and dry matter production of shoot and root of cucumber seedlings. Therefore, present study suggests that PGPB isolates viz. BASU390, BASU625, BASU645, BASU589, BASU630 and BASU205 may be used as biofertilizers to enhance the growth and productivity of cucumber.
Plant growth promoting bacteria, Phosphate solubilization, HCN, IAA
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