Table 3.
Differential characteristics of the strain RG38T in comparison to closely related species of Streptomyces species.
| Characteristics | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| Isolation source | Roots | Soil | Soil | Soil |
| Morphology and pigmentation: | ||||
| Color of spore mass (ISP2) | Light gray | White | Olive green | Blue gray |
| Diffusible pigment on ISP2 | + | − | + | |
| Growth with/at: | ||||
| 15% (w/v) NaCl tolerance | + | − | − | − |
| pH5 | + | + | − | − |
| 45°C | + | − | − | − |
| Optimal temperature | 25–30 | 28–30 | 28–30 | 28 |
| Nitrate reduction | + | + | − | + |
| Indole production on tryptophan | + | − | + | + |
| Glucose fermentation | − | + | + | − |
| Arginine dihydrolase | − | + | − | − |
| Urease | + | + | − | − |
| Esculin hydrolysis | + | − | − | + |
| Gelatin hydrolysis | − | + | + | − |
| Assimilation of (20NE): | ||||
| D-Mannitol | − | + | + | − |
| D-Maltose | − | + | + | − |
| Potassium gluconate | + | − | + | + |
| Capric acid | − | − | − | + |
| Adipic acid | − | + | + | − |
| Malic acid | − | + | + | + |
| Trisodium citrate | − | + | − | + |
| API ZYM activities: | ||||
| Alkaline phosphatase | + | + | + | − |
| Lipase (C14) | + | + | + | − |
| Leucine arylamidase | − | + | + | + |
| Valline arylamidase | − | + | + | + |
| Cystine arylamidase | − | + | − | + |
| Trypsin | + | + | − | + |
| α-chymotrypsin | + | + | − | − |
| Acid phosphatase | + | − | + | − |
Strain: 1, RG38T; 2, S. collinus NBRC 12759T; 3, S. iakyrus NRRL ISP-5482T and S. glaucescens NBRC 12774T. All data are from this study.