Research Article
Symbiotic Efficiency of Native Rhizobia Nodulating Common Bean (Phaseolus vulgaris L.) in Soils of Western Kenya
Table 2
Morphological and cultural characteristics of the rhizobia isolates from Kisumu and MMUST.
| | Characteristics | Isolates | | KSM001 | KSM002 | KSM003 | KSM004 | KSM005 | KSM006 | KSM007 | KSM008 | MMUST003 | MMUST004 | MMUST005 | MMUST006 |
| | Congo red absorption | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | BTB
reaction | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | Colony
colour | Cream yellow | Cream
white | Cream white | Milky white | Milky white | Cream yellow | Cream white | Cream white | Milky white | Cream yellow | Milky white | Cream yellow | Colony
transparency | Opaque | Translucent | Opaque | Opaque | Translucent | Translucent | Opaque | Translucent | Opaque | Translucent | Opaque | Opaque | | Colony appearance | Shiny | Shiny | Shiny | Dull | Dull | Shiny | Shiny | Shiny | Shiny | Shiny | Dull | Dull | EPS
production | ✓ | ✓ | ✓ | x | x | ✓ | ✓ | ✓ | x | ✓ | x | ✓ | Colony
texture | Firm,
dry | Smooth,
viscous | Smooth, viscous | Firm, dry | Firm, dry | Smooth, viscous | Smooth, viscous | Smooth, viscous | Smooth, viscous | Smooth, viscous | Firm, dry | Firm, dry | Colony
shape | Circular | Oval | Oval | Circular | Circular | Circular | Oval | Oval | Circular | Circular | Circular | Circular | Colony
elevation | Convex | Convex | Convex | Convex | Convex | Convex | Convex | Convex | Convex | Convex | Convex | Convex | Colony
diameter (mm) | 3.7 | 4.7 | 5.7 | 3.7 | 4.0 | 3.7 | 5.0 | 3.3 | 4.7 | 3.3 | 3.0 | 1.0 | | Gram stain | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ | Colony
margin | Entire | Entire | Entire | Entire | Entire | Entire | Entire | Entire | Entire | Entire | Entire | Entire |
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BTB: bromothymol blue, EPS: exopolysaccharides, ✓: positive reaction, and x: negative.
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