Research Article
Antimicrobial Potential of Streptomyces spp. Isolated from the Rift Valley Regions of Ethiopia
Table 4
Morphological, physiological, and biochemical characteristics of the test isolates.
| Actinomycete isolates | Growth media | RVE 002 | RVE004 | RVE029 | RVE077 | RVE116 | RVE118 | RVE125 | RVE129 | RVE133 | RVE144 | RVE165 | RVE172 | RVE187 | RVE193 | RVE194 | RVE214 | RVE217 | RVE219 | RVE226 | RVE227 | RVE234 | RVE239 | RVE247 | RVE248 |
| ISP 2 | + | ++ | +++ | +++ | ++ | +++ | ++ | +++ | ++ | ++ | +++ | ++ | ++ | ++ | +++ | ++ | +++ | ++ | +++ | +++ | ++ | ++ | +++ | +++ | ISP 3 | +++ | +++ | +++ | ++ | ++ | + | + | ++ | ++ | +++ | + | +++ | +++ | +++ | + | +++ | +++ | +++ | ++ | +++ | ++ | +++ | ++ | ++ | ISP 4 | +++ | +++ | ++ | +++ | +++ | +++ | ++ | ++ | +++ | ++ | +++ | +++ | +++ | +++ | +++ | ++ | +++ | ++ | ++ | ++ | +++ | +++ | ++ | +++ | ISP 5 | ++ | + | ++ | ++ | +++ | + | + | + | ++ | + | + | + | ++ | + | ++ | ++ | ++ | ++ | + | + | ++ | ++ | +++ | ++ | ISP 6 | +++ | +++ | + | + | +++ | ++ | +++ | +++ | +++ | ++ | ++ | ++ | +++ | ++ | +++ | +++ | +++ | + | ++ | ++ | +++ | ++ | + | +++ | ISP 7 | ++ | ++ | +++ | +++ | ++ | + | ++ | +++ | + | ++ | ++ | + | +++ | ++ | + | + | + | ++ | ++ | ++ | ++ | ++ | + | + | SCA | ++ | +++ | +++ | ++ | ++ | +++ | +++ | +++ | +++ | +++ | + | + | ++ | +++ | +++ | +++ | + | ++ | ++ | +++ | +++ | ++ | ++ | ++ | Enzyme production | | | | | | | | | | | | | | | | | | | | | | | | | Urease | ++ | − | − | − | − | ++ | − | − | + | − | − | − | ++ | ++ | − | − | − | − | ++ | − | + | − | − | + | Amylase | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | Chitinase | +++ | + | ++ | ++ | − | − | − | +++ | − | − | + | + | + | + | + | + | + | + | + | + | + | + | + | + | Oxidase | + | − | − | + | + | + | ++ | ++ | ++ | − | ++ | ++ | + | + | ++ | + | − | + | ++ | + | − | ++ | − | + | Catalase | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | + | Caesinase | + | + | + | + | + | + | − | + | + | + | + | − | + | + | + | + | − | + | + | + | + | + | − | + | Nitrate reductase | − | − | ++ | − | − | ++ | − | ++ | − | ++ | ++ | − | ++ | − | − | − | ++ | − | − | − | − | − | ++ | ++ | Gelatin hydrolysis | + | − | + | + | − | + | + | + | + | + | + | − | + | − | + | + | − | + | + | − | + | − | + | − | Citrate utilization | + | + | − | + | + | − | + | + | − | + | + | + | + | + | + | − | − | + | + | + | + | − | + | + | Melanin formation | ++ | + | − | ++ | +++ | + | + | + | ++ | + | + | ++ | + | ++ | ++ | + | ++ | ++ | +++ | − | + | + | ++ | − | Optimum pH | 7.5 | 7.5 | 7.5 | 7 | 8 | 8 | 7.5 | 7.5 | 8 | 7 | 7.5 | 7 | 8 | 7.5 | 7 | 7.5 | 7.5 | 7.5 | 7 | 7.5 | 8 | 7.5 | 8 | 7 | Optimum NaCl | 2.5 | 5 | 5 | 2.5 | 5 | 2.5 | 2.5 | 5 | 5 | 2.5 | 5 | 2.5 | 2.5 | 2.5 | 2.5 | 5 | 2.5 | 5 | 5 | 5 | 2.5 | 2.5 | 5 | 5 | Optimum T°(°C) | 25 | 30 | 30 | 30 | 30 | 25 | 30 | 30 | 30 | 30 | 25 | 30 | 30 | 25 | 25 | 30 | 30 | 30 | 30 | 30 | 30 | 25 | 25 | 30 |
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−, No growth; +, poor growth; ++, moderate growth; +++, abundant growth.
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