TABLE 1.
Production of indole-3-acetic acid (IAA), polyamines and 1-aminocyclopropane-1-carboxylic acid deaminase (ACCD) by the selected actinobacterial isolates obtained from Salicornia bigelovii rhizosphere.
| Isolatea | IAA equivalents (μg mL–1) | Polyamines |
ACCD activity (nanomoles α keto-butyrate mg–1 protein h–1) | ||
| Put (mg L–1) | Spd (mg L–1) | Spm (mg L–1) | |||
| #2 | ND | 312.13 ± 7.48 a | 71.75 ± 4.69 a | ND | 247.78 ± 8.29 a |
| #4 | 29.76 ± 1.92 a | 385.50 ± 6.89 b | 95.87 ± 4.65 b | 25.79 ± 2.40 a | 402.98 ± 5.78 b |
| #6 | ND | ND | ND | ND | 448.14 ± 7.19 c |
| #7b | ND | 503.59 ± 11.19 c | 204.70 ± 8.28 c | 54.46 ± 4.32 b | ND |
| #11b | ND | ND | ND | ND | 440.02 ± 8.32 c |
| #18 | 20.26 ± 1.21 b | ND | ND | ND | ND |
| #21b | 2.88 ± 0.87 c | ND | ND | ND | ND |
| #25 | ND | 432.26 ± 9.78 c | 135.43 ± 7.18 d | 57.14 ± 1.68 b | ND |
| #27 | 10.98 ± 1.04 d | ND | ND | ND | 118.67 ± 5.22 d |
| #32 | 17.89 ± 0.75 e | 278.01 ± 5.98 d | 68.01 ± 4.89 a | 38.63 ± 1.27 c | ND |
a#4, #6, #7, #11, #21, #25, and #32 belonged to streptomycete actinobacteria; whilst #2, #18, and #27 belonged to non-streptomycete actinobacteria. b#7, #11, and #21 represent Streptomyces tritolerans RAK1, S. rochei RAMS1, and S. chartreusis UAE1, respectively. Values are means of eight independent replicates ± SE for each sampling from two independent experiments. Mean values followed by different letters are significantly (P < 0.05) different from each other according to Fisher’s Protected LSD Test. Put, putrescine; Spd, spermidine; Spm, spermine; ND, non-detectable.