TABLE 3.

Potential plant-growth-promoting traits of R. leguminosarum bv. trifolii strains isolated from nodules of T. repens from the metal-polluted waste heap (WH) and non-polluted reference grassland (R).

Plant growth promotion trait	WH	R
Acetoin [%]	80	11*
ACCD [%]	90	89
Mean ACCD activity [μM α-ketobutyrate×mg protein–1]	0.064 ± 0.09	0.062 ± 0.16
IAA [%]	80	100
Mean IAA concentration [μg×mL–1]	50.17 ± 14.26	35.79 ± 18.71
Organic acids [%]	70	56
Siderophores [%]	70	56
P solubilization [%]	90	78

Significant differences between groups were marked with an asterisk.