Table 2.
Screening of recovered endophytic microbes for plant growth regulating (PGR) attributes.
| Endophytic Isolates | Production of Indole-3-Acetic Acid (µg mL−1) | ACC Deaminase Activity (μmol α-KB/mg Protein/h) | Siderophore Production | Production of | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Qualitative | Quantitative | Qualitative | Quantitative | Qualitative | Halo Size (mm) | Salicylic Acid (µg mL−1) | 2,3-DHBA (µg mL−1) | Ammonia | HCN | |
| BPR-1 | + | 22.4 ± 1.7 (e) | – | – | + | 16.2 ± 1.4 (c) | 11.2 ± 1.6 (e) | 21.2 ± 2.4 (c) | + | + |
| BPR-2 | – | – | + | 12.0 ± 1.8 (f) | ++ | 20.3 ± 0.7(a) | 12.8 ± 0.6 (e) | 17.8 ± 0.8 (d) | + | – |
| BPR-3 | ++ | 40.2 ± 2.8 (c) | + | 14.0 ± 1.3 (e) | + | 10.3 ± 0.0 (e) | 18.9 ± 0.72 (c) | 21.4 ± 1.7 (c) | + | – |
| BPR-4 | + | 23.2 ± 3.2 (e) | + | 9.2 ± 0.3 (g) | + | 14.4 ± 2.2 (d) | 13.2 ± 0.2 (e) | 34.6 ± 2.6 (b) | ++ | + |
| BPR-5 | + | 17.8 ± 1.4 (f) | – | – | – | – | – | – | + | |
| BPR-6 | + | 24.2 ± 2.5 (d) | – | – | + | 15.0 ± 2.1 (c) | 17.3 ± 2.1 (c) | 21.2 ± 0.81 (c) | ++ | |
| BPR-7 | + | 20.3 ± 2.0 (e) | + | 21.1 ± 1.6 (c) | – | – | – | – | + | + |
| BPR-8 | + | 26.9 ± 3.0 (d) | + | 18.4 ± 2.2 (d) | + | 11.4 ± 1.4 (d) | 9.6 ± 0.8 (g) | 19.4 ± 2.1 (d) | ++ | + |
| BPR-9 | + | 25.2 ± 3.6 (e) | + | 23.2 ± 2.2 (b) | ++ | 19.6 ± 1.6 (a) | 16.6 ± 3.1 (d) | 38.9 ± 3.2 (b) | ++ | + |
| BPR-10 | + | 18..3 ± 1.3 (f) | + | 17.1 ± 1.5 (d) | + | 12.0 ± 0.3 (e) | 23.4 ± 2.3 (b) | 17.8 ± 1.7 (e) | ++ | + |
| BPR-11 | + | 17.6 ± 1.2 (f) | – | – | + | 14.2 ± 1.8 (c) | 31.3 ± 4.6 (a) | 20.6 ± 0.9 (c) | + | + |
| BPR-12 | – | – | + | 12.1 ± 1.1 (f) | + | 18.2 ± 2.3 (b) | 23.4 ± 2.0 (b) | 21.0 ± 4.6 (c) | + | + |
| BPR-13 | ++ | 36.5 ± 2.3 (c) | – | – | – | – | – | – | ++ | + |
| BPR-14 | ++ | 48.3 ± 3.1 (b) | + | 14.0 ± 1.6 (e) | + | 9.3 ± 0.8 (e) | 25.2 ± 2.7 (b) | 17.9 ± 2.3 (e) | ++ | – |
| BPR-15 | +++ | 60.2 ± 3.7 (a) | ++ | 27.2 ± 4.2 (a) | ++ | 20.4 ± 2.6 (a) | 33.9 ± 0.9 (a) | 47.0 ± 2.1 (a) | +++ | – |
| BPR-16 | – | – | + | 15.8 ± 2.0 (e) | + | 14.0 ± 1.5 (c) | 23.0 ± 2.4 (b) | 23.8 ± 5.7 (c) | ++ | + |
| BPR-17 | – | – | + | 19.7 ± 3.1 (c) | – | – | 19.7 ± 0.8 (c) | – | + | – |
| BPR-18 | + | 11.4 ± 0.38 (g) | – | – | + | 16.0 ± 0.8 (b) | 11.6 ± 2.3 (f) | 18.6 ± 0.8 (e) | + | – |
| BPR-19 | + | 20.3 ± 2.0 (e) | + | 20.4 ± 1.4 (c) | + | 15.5 ± 2.3 (b) | 10.7 ± 1.5 (f) | 23.2 ± 3.5 (c) | + | + |
| BPR-20 | + | 21.4 ± 1.2 (e) | + | 13.4 ± 1.7 (e) | + | 11.7 ± 0.9 (e) | 9.3 ± 0.5 (g) | 17.8 ± 2.4 (e) | ++ | – |
| BPR-21 | – | – | – | – | + | 18.0 ± 2.0 (b) | 12.4 ± 1.9 (f) | 21.0 ± 4.6 (c) | + | – |
| BPR-22 | – | – | – | – | + | 18.0 ± 00 (b) | 10.3 ± 0.9 (g) | 17.9 ± 2.3 (e) | + | – |
| BPR-23 | + | 17.6 ± 1.2 (f) | – | – | + | 15.2 ± 1.3 (c) | 10.7 ± 1.5 (g) | 21.4 ± 1.7 (c) | + | + |
| BPR-24 | + | 18..3 ± 1.3 (f) | – | – | – | – | – | – | ++ | – |
| BPR-25 | + | 16.0 ± 1.3 (f) | – | – | – | – | – | – | + | – |
Here, ACC = 1-aminocyclopropane 1-carboxylate; α-KB = α-keto butyrate; NH3 = ammonia; HCN = hydrogen cyanide; 2,3-DHBA = dihydroxy benzoic acid; Single ‘–’, ‘+’ denotes no production and moderate production while ‘++’ and ‘+++’ represents the high and maximum production, respectively. Letters a, b, c, d etc. in parenthesis depicts that mean values are significantly different from each other according to Duncan’s multiple range test (DMRT).