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Table 1 Minimum inhibitory concentrations (MIC) of Cr (VI) and plant growth-promoting (PGP) traits of the bacterial isolates. Data are the mean of replicates with SE±. Values with different letters are significantly different (p < 0.05)

From: Improved chromium tolerance of Medicago sativa by plant growth-promoting rhizobacteria (PGPR)

Isolat

MIC (mg/L) Cr (VI)

PSI

IAA (μg/mL)

Sid

N2

EPS

NH3

HCN

Case

Pase

Chase

NT1

600

2.4 ± 0.2cde

167 ± 1.42e

+

–

–

+

–

+

+

+

NT2

400

1.33 ± 0.1fgh

187.5 ± 1.5cd

+

+

–

+

–

+

+

+

NT3

600

1.8 ± 0.1cdefgh

125.75 ± 1.45h

–

–

–

+

+

+

–

+

NT4

600

2.8 ± 0.2bc

10 ± 0.42p

+

–

–

+

+

+

+

+

NT5

600

2.33 ± 0.3cdef

71.5 ± 1.1k

+

–

–

+

–

+

+

+

NT6

600

1.14 ± 0.2h

144.75 ± 1.37fg

–

+

–

+

–

+

–

–

NT7

400

1.83 ± 0.3cdefgh

161.75 ± 1.47e

+

+

–

+

+

+

–

+

NT8

400

2 ± 0.1cdefgh

63.25 ± 1.18lm

–

–

–

+

+

–

+

+

NT9

600

1.25 ± 0.1gh

61.5 ± 1.15lm

+

+

+

+

+

–

+

+

NT10

300

2 ± 0.2cdefgh

92.25 ± 1.21ij

+

–

–

+

+

+

+

+

NT11

600

1.44 ± 0.3efgh

144 ± 1.19g

+

+

–

+

+

–

–

+

NT12

400

2 ± 0.2cdefgh

143.75 ± 1.22g

+

+

+

+

+

+

–

–

NT13

300

1.92 ± 0.4cdefgh

189.5 ± 2.43c

+

+

–

+

+

+

–

+

NT14

300

2 ± 0.1cdefgh

45.5 ± 1.16o

+

+

–

+

+

+

+

+

NT15

600

3.6 ± 0.5ab

192.95 ± 2.5c

+

+

–

+

+

–

–

+

NT16

400

1.71 ± 0.2defgh

73 ± 1.25k

+

+

+

+

+

–

+

+

NT17

600

1.68 ± 0.3defgh

124.5 ± 1.68h

+

–

–

+

–

–

+

+

NT18

400

2.06 ± 0.4cdefgh

96.75 ± 1.23i

+

–

–

+

–

–

+

+

NT19

600

2.55 ± 0.1cd

88.63 ± 1.25j

+

+

+

+

–

+

+

+

NT20

600

2.1 ± 0.1cdefgh

572.27 ± 4.25a

+

+

+

+

+

+

+

+

NT21

400

2.07 ± 0.4cdefgh

181.5 ± 1.31d

+

–

–

+

+

+

–

+

NT22

600

2.54 ± 0.2cd

49 ± 1.14no

+

+

–

+

+

–

–

–

NT23

300

2.57 ± 0.3cd

152 ± 2.24f

+

–

–

+

+

+

–

+

NT24

400

2.21 ± 0.1cdefg

213.25 ± 3.44b

+

–

–

+

+

–

+

+

NT25

300

3.91 ± 0.6a

56.25 ± 1.16mn

+

–

–

–

+

+

–

–

NT26

600

2.09 ± 0.2cdefgh

46.75 ± 1.17o

+

+

–

+

–

+

–

+

NT27

600

2.62 ± 0.3cd

64.11 ± 1.13kl

+

+

+

+

+

+

+

+

  1. + positive test, – negative test, Sid siderophores, Chase chitinase, Case cellulase, Pecase pectinase, PSI phosphate solubilization index