Methylobacterium populi VP2: Plant Growth-Promoting Bacterium Isolated from a Highly Polluted Environment for Polycyclic Aromatic Hydrocarbon (PAH) Biodegradation

Table 2

Plant growth-promoting activities of Methylobacterium populi VP2.

Microbial strain	IAA^a production (NB) (mg L^−1  ± SD)	IAA^b production (NB + TRP) (mg L^−1  ± SD)	Siderophores production	Phosphate solubilization	Ammonia production
M.  populi VP2	1.38 ± 0.07	5.27 ± 0.05	1.4 ± 0.03 mm	2.8 ± 0.06 mm	—

aIAA production in Nutrient Broth without L-tryptophan.
^bIAA production in Nutrient Broth supplemented with L-tryptophan.