Table 3 Salt tolerance, antimicrobial activities and plant growth promoting properties of actinobacteria strains isolated from Glycyrrhiza inflata Bat.

From: Actinobacteria associated with Glycyrrhiza inflata Bat. are diverse and have plant growth promoting and antimicrobial activity

Strain

NaCl tolerance (mM)

Inhibition of indicator organisms2 (mm)

IAA (mg L−1)

Siderophore

P solubilization

Chitinase

200

300

400

500

1

2

3

4

5

6

7

One year old G. inflata

Streptomyces SCAU5214

*1

*

*

—

3.5 ± 0.31FGH

—

—

3.1 ± 0.21H

—

2.7 ± 0.15FG

2.8 ± 0.26F

11.5 ± 0.33J

*

—

—

Streptomyces SCAU5218

*

*

—

—

2.2 ± 0.32J

2.3 ± 0.25EFG

3.3 ± 0.23E

4.2 ± 0.30F

—

3.2 ± 0.25EF

—

36.7 ± 0.36D

—

—

—

Micromonospora SCAU5223

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

Micromonospora SCAU5224

*

*

—

—

—

—

—

—

—

—

—

11.3 ± 0.24J

—

—

—

Micromonospora SCAU5225

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

Promicromonospora SCAU5226

*

—

—

—

5.7 ± 0.41D

—

—

—

—

—

—

—

—

—

—

Rhodococcus SCAU5228

—

—

—

—

—

—

—

—

—

—

5.9 ± 0.25D

—

—

—

—

Rhodococcus SCAU5229

*

*

—

—

—

—

—

—

—

—

—

18.2 ± 0.65G

—

—

—

Streptomyces SCAU5257

*

—

—

—

3.2 ± 0.21GH

2.4 ± 0.32EFG

6.9 ± 0.25B

7.0 ± 0.10E

—

—

3.5 ± 0.45E

5.4 ± 0.31M

—

—

—

Streptomyces SCAU5270

*

—

—

—

—

3.6 ± 0.12 C

2.7 ± 0.15F

2.6 ± 0.06I

2.8 ± 0.15G

5.8 ± 0.35D

6.5 ± 0.35C

27.5 ± 0.55E

*

—

*

Streptomyces SCAU5276

*

*

*

—

—

—

2.3 ± 0.20GH

3.3 ± 0.25GH

—

—

—

55.5 ± 0.38B

*

*

*

Streptomyces SCAU5281

—

—

—

—

—

1.9 ± 0.06GHI

1.7 ± 0.25I

4.2 ± 0.25F

3.4 ± 0.15F

5.6 ± 0.25D

8.2 ± 0.30B

23.9 ± 0.37F

*

—

*

Streptomyces SCAU5283

*

*

*

*

4.4 ± 0.21E

1.8 ± 0.06GH

4.1 ± 0.12C

3.6 ± 0.16G

—

3.6 ± 0.20E

—

71.8 ± 0.21A

*

*

—

Three year old G. inflata

Streptomyces SCAU5201

*

*

*

*

7.8 ± 0.20B

5.5 ± 0.41B

3.5 ± 0.06DE

12.7 ± 0.21A

7.1 ± 0.25C

13.5 ± 0.40A

4.8 ± 0.21D

37.1 ± 0.78D

*

*

*

Streptomyces SCAU5202

*

*

*

 

6.5 ± 0.38C

2.3 ± 0.12EFGH

4.4 ± 0.32C

8.3 ± 0.32C

8.3 ± 0.26B

8.5 ± 0.36B

5.5 ± 0.26D

6.2 ± 0.48ML

*

—

*

Streptomyces SCAU5203

*

*

—

—

—

2.9 ± 0.10D

4.2 ± 0.15C

7.8 ± 0.20D

—

—

2.8 ± 0.15F

5.7 ± 0.19M

*

—

—

Streptomyces SCAU5204

*

*

—

—

—

—

—

—

—

—

—

3.5 ± 0.42°

*

—

—

Streptomyces SCAU5205

*

*

*

—

3.7 ± 0.32FG

—

—

3.2 ± 0.15H

4.3 ± 0.26E

—

2.2 ± 0.12G

18.3 ± 0.23G

*

—

*

Streptomyces SCAU5206

*

*

—

—

2.7 ± 0.06IJ

3.9 ± 0.35C

3.3 ± 0.15E

8.3 ± 0.31C

6.6 ± 0.31D

—

—

—

*

—

—

Streptomyces SCAU5207

*

*

*

—

—

2.0 ± 0.06FGH

3.3 ± 0.20E

7.7 ± 0.21D

—

—

—

—

*

—

*

Streptomyces SCAU5209

*

—

—

—

—

—

2.6 ± 0.15FG

8.4 ± 0.31B

—

7.0 ± 0.21C

3.4 ± 0.10E

—

*

—

*

Streptomyces SCAU5210

*

*

*

*

6.3 ± 0.40C

2.4 ± 0.25EF

8.7 ± 0.25A

8.4 ± 0.25C

—

—

15.5 ± 0.32A

—

*

*

—

Streptomyces SCAU5211

*

*

—

—

—

2.7 ± 0.21DE

3.8 ± 0.06D

—

—

—

—

10.7 ± 0.67K

—

*

*

Streptomyces SCAU5212

*

*

—

—

2.33 ± 0.35J

3.6 ± 0.25 C

2.8 ± 0.21F

—

3.6 ± 0.26F

3.3 ± 0.25EF

3.6 ± 0.25E

4.9 ± 0.56MN

*

*

—

Streptomyces SCAU5215

*

*

*

—

8.8 ± 0.32A

2.5 ± 0.35DEF

2.1 ± 0.10H

—

9.5 ± 0.32A

—

2.3 ± 0.15G

46.2 ± 0.12C

*

*

*

Streptomyces SCAU5216

*

*

—

—

—

3.5 ± 0.35C

2.6 ± 0.15FG

—

—

—

—

16.6 ± 0.57H

—

*

—

Streptomyces SCAU5217

*

—

—

—

3.3 ± 0.17GH

2.2 ± 0.12FGH

2.3 ± 0.10GH

—

—

—

—

9.5 ± 0.36K

—

—

—

Streptomyces SCAU5219

*

*

*

—

3.9 ± 0.25EF

6.3 ± 0.25 A

6.7 ± 0.12B

—

8.4 ± 0.15B

6.5 ± 0.35C

—

2.3 ± 0.32°

*

—

—

Streptomyces SCAU5220

—

—

—

—

3.2 ± 0.30HI

1.7 ± 0.21GHI

3.6 ± 0.26DE

—

3.3 ± 0.21F

2.5 ± 0.31G

2.0 ± 0.30G

13.5 ± 0.66I

*

—

—

Micromonospora SCAU5222

*

—

—

—

4.3 ± 0.29E

2.6 ± 0.25DE

4.2 ± 0.27C

—

—

—

—

7.6 ± 0.71L

—

—

*

Nocardioides SCAU5227

*

—

—

—

—

—

—

—

—

—

—

—

—

—

—

Arthrobacter SCAU5230

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

Actinokineospora SCAU5231

*

—

—

—

1.57 ± 0.12K

2.3 ± 0.17EFGH

3.6 ± 0.20DE

—

—

—

4.4 ± 0.31D

9.4 ± 0.57K

—

—

—

Actinomadura SCAU5232

—

—

—

—

2.5 ± 0.30J

—

—

—

—

2.6 ± 0.13G

—

—

—

—

*

Oerskovia SCAU5233

—

—

—

—

—

—

—

—

—

—

—

—

—

—

—

Cellulomonas SCAU5234

—

—

—

—

—

2.1 ± 0.32FGH

2.8 ± 0.21F

—

—

—

—

19.6 ± 0.54G

—

—

—

  1. The values are mean ± standard deviation (n = 3). Different letters in a column indicate statistically significant differences (p < 0.05, Duncan’s multiple range test).
  2. (1) *Growth or PGP activity detected; —No growth, no inhibition, or PGP activity not detected.
  3. (2) Indicator organisms: 1: Mycogone perniciosa Magn [SCAU3216]; 2: Curvularia lunata Boedijn [SCAU3697]; 3: Alternaria alternata (Fries) Keissler [SCAU3471]; 4: Fusarium graminearum Sehw. [SCAU3741]; 5: Fusarium oxysporum [SCAU3221]; 6: Staphylococcus aureus [ATCC 25923]; 7: Escherichia. coli [ATCC35218].