Table 1.
Main plant-growth promoting (PGP) traits for which the bacteria were screened.
| Strains | Species | IAA Production (mg/L) |
NH3
Production |
HCN Production |
ACC Deaminase Activity (nmol α-Ketobutyrate/g h) |
Siderophore Production | Phospate Solubilization |
|---|---|---|---|---|---|---|---|
| SI 257 | Br. frigoritolerans | 2.50 ± 0.3 ghijk | − | − | 0 w | − | − |
| SI 264 | Br. frigoritolerans | 2.50 ± 0.4 ghijk | + | − | 0 w | − | − |
| SI 325 | Br. frigoritolerans | 0 k | − | − | 37.17 ± 2 hijk | + | − |
| SI 312 | Br. frigoritolerans | 1.76 ± 0.2 ijk | + | − | 22.72 ± 5 mnopqr | + | − |
| SI 385 | Br. frigoritolerans | 3.46 ± 0.2 defghij | − | − | 9.05 ± 3 stuvw | − | − |
| SI 333 | Br. frigoritolerans | 3.75 ± 0.61 cdefghij | − | − | 40.60 ± 6 fghi | − | − |
| SI 349 | Br. frigoritolerans | 6.72 ± 0.65 ab | − | − | 28.91 ± 6 jklm | − | − |
| SI 400 | Br. frigoritolerans | 1.76 ± 0.1 ijk | + | − | 0 w | + | − |
| SI 433 | Br. frigoritolerans | 7.37 ± 0.5 a | − | − | 80.58 ± 4 a | − | − |
| SI 387 | Br. frigoritolerans | 6.72 ± 0.6 ab | − | − | 16.18 ± 2 opqrst | + | − |
| SI 293 | R. erythropolis | 2.14 ± 0.2 hijk | − | − | 72.56 ± 4 ab | − | − |
| SI 250 | R. equi | 3.15 ± 0.15 efghij | − | − | 17.52 ± 7 nopqrs | + | − |
| SI 271 | N. globerula | 4.81 ± 0.2 abcdefgh | − | − | 0 w | − | − |
| SI 279 | Str. mauvecolor | 3.15 ± 0.32 efghij | − | − | 4.20 ± 1 uvw | − | − |
| SI 332 | Str. Silaceus | 5.33 ± 0.34 abcdefg | − | − | 0 w | + | 3.01 |
| SI 362 | M. hydrocarboxydans | 5.57 ± 0.52 abcdef | − | − | 34.85 ± 5 ijkl | − | − |
| SI 371 | M. oxydans | 4.83 ± 0.38 abcdefgh | − | − | 23.98 ± 5 lmnopq | − | − |
| SI 295 | A. nitrophenolicus | 5.08 ± 0 abcdeg | − | − | 55.96 ± 6 cde | − | − |
| SI 429 | P. aurescens | 3.46 ± 0.14 defghij | + | − | 0 w | − | − |
| SI 236 | I. cucumis | 5.81 ± 0.31 abcde | − | − | 9.05 ± 3 stuvw | − | − |
| SI 254 | Pb. simplex | 6.50 ± 0.37 abc | − | − | 20.15 ± 3 mnopqrs | − | − |
| SI 397 | Pb. simplex | 4.03 ± 0.07 bcdefghij | − | − | 7.51 ± 2 tuvw | + | − |
| SI 259 | Pb. simplex | 1.33 ± 0.3 jk | − | − | 49.49 ± 5 efg | + | − |
| SI 306 | B. tequilensis | 3.15 ± 0.22 efghij | − | − | 0 w | − | − |
| SI 296 | B. tequilensis | 3.46 ± 0.35 defghij | − | − | 25.23 ± 4 lmnop | + | − |
| SI 319 | B. tequilensis | 6.27 ± 0.3 abcd | − | − | 51.66 ± 5 def | + | − |
| SI 354 | B. tequilensis | 6.72 ± 0.1 ab | − | − | 0 w | − | − |
| SI 305 | B. megaterium | 5.57 ± 0.3 abcdef | − | − | 27.69 ± 4 jklmn | + | − |
| SI 404 | B. megaterium | 6.94 ± 0.88 ab | − | − | 7.51 ± 0.7 tuvw | + | − |
| SI 408 | B. megaterium | 5.08 ± 0.11 abcdefg | + | − | 38.32 ± 6 ghij | − | − |
| SI 470 | B. megaterium | 4.83 ± 0.04 abcdefgh | − | − | 14.81 ± 2 pqrstu | − | − |
| SI 266 | B. megaterium | 6.04 ± 0.1 abcde | − | − | 0 w | − | − |
| SI 339 | B. halotolerans | 0 k | + | − | 34.85 ± 3 ijkl | − | − |
| SI 419 | B. halotolerans | 4.83 ± 0 abcdefgh | − | − | 27.69 ± 4 jklmn | + | − |
| SI 297 | B. mohavensis | 1.33 ± 0.13 jk | − | − | 7.51 ± 2 tuvw | − | − |
| SI 311 | B. cabrialensis | 4.83 ± 0.4 abcdefgh | − | − | 0 w | − | − |
| SI 428 | B. cabrialesii | 6.94 ± 0.04 ab | + | − | 0 w | − | − |
| SI 356 | T. saccharophilus | 6.27 ± 0.21 abcd | − | − | 64.36 ± 6 bc | − | − |
| SI 243 | E. adherens | 2.50 ± 0.3 ghijk | + | − | 0 w | − | − |
| SI 240 | Sn. meliloti | 5.57 ± 0.3 abcdef | − | − | 0 w | + | 2.96 |
| SI 235 | Sn. meliloti | 6.50 ± 0.3 abc | − | − | 9.05 ± 1 stuvw | − | − |
| SI 420 | S. quinivorans | 0 k | + | − | 17.52 ± 3 nopqrs | + | − |
| SI 237 | C. respiraculi | 0 k | − | − | 18.85 ± 3 mnopqrs | − | − |
| SI 435 | V. paradoxus | 5.33 ± 0.4 abcdefg | − | − | 0 w | − | 3.1 |
| SI 439 | V. paradoxus | 5.33 ± 0.42 abcdefg | − | − | 0 w | − | − |
| SI 321 | St. indicatrix | 6.50 ± 0.3 abc | + | − | 26.47 ± 4 klmno | + | − |
| SI 358 | L. soli | 4.57 ± 0.37 abcdefghij | + | − | 37.17 ± 3 hijk | − | − |
| SI 357 | L. soli | 2.14 ± 0.02 hijk | + | − | 0 w | − | − |
| SI 377 | St. rhizophila | 4.57 ± 0.23 abcdefghi | − | − | 18.85 ± 2 mnopqrs | + | − |
| SI 367 | Ps. Plecoglossicida | 6.50 ± 0.28 abc | − | − | 20.15 ± 3 mnopqrs | + | − |
| SI 247 | Ps. brassicacearum | 3.75 ± 0.6 cdefghij | − | + | 16.18 ± 2 opqrst | + | − |
| SI 307 | Ps. frederiksbergensis | 3.15 ± 0.2 efghij | + | + | 48.40 ± 5 efgh | + | 3.80 |
| SI 441 | Ps. reinekei | 6.50 ± 1 abc | + | + | 45.09 ± 6.4 efghi | + | − |
| SI 443 | Ps. atacamensis | 2.14 ± 0.2 ghijk | + | + | 10.54 ± 1 stuvw | + | 3.85 |
| SI 422 | Ps. granadensis | 5.08 ± 1 abcdefg | + | + | 16.18 ± 3 opqrst | + | 3.2 |
| SI 450 | Ps. granadensis | 0 k | + | + | 12.00 ± 1 rstuv | + | − |
| SI 434 | Ps. moorei | 4.83 ± 0.65 abcdefgh | − | − | 14.81 ± 3 pqrstu | + | − |
| SI 270 | Ps. lini | 2.83 ± 0.1 fghijk | + | − | 0 w | + | 4.99 |
| SI 285 | Ps. lini | 2.83 ± 0.22 fghijk | + | + | 0 w | + | − |
| SI 276 | Ps. lini | 2.14 ± 0.12 hijk | − | − | 13.42 ± 2.4 qrstu | + | − |
| SI 284 | Ps. lini | 3.46 ± 0.2 defghij | + | + | 0 w | + | − |
| SI 288 | Ps. lini | 6.27 ± 0.34 abcd | + | − | 16.2 ± 3 opqrst | + | 4 |
| SI 287 | Ps. lini | 3.15 ± 0.1 efghij | − | − | 62.28 ± 4.8 bcd | + | − |
Abbreviations are as follows: IAA, indole acetic acid; ACC, 1-aminocyclopropane-1-carboxylate deaminase activity; A., Arthrobacter; B., Bacillus; Br., Brevibacterium; C., Cupriavidus; E., Ensifer; I., Isoptericola; L., Lysobacter; M., Microbacterium; N., Nocardia; P., Paenarthrobacter; Pb., Peribacillus; Ps., Pseudomonas; R., Rhodococcus; S., Serratia; Sn., Sinorhizobium; St., Stenotrophomonas; Str., Streptomyces; T., Terribacillus; V., Variovorax. Data within a column followed by the same letter are not significantly different for p ≤ 0.05 according to Tukey’s test.