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- Colony shape. It includes the form, elevation, and margin of the bacterial colony. Form of the bacterial colony: The form refers to the shape of the colony.
- Size of the bacterial colony. The size of the colony can be a useful characteristic for identification. The diameter of a representative colony may be measured in millimeters or described in relative terms such as pinpoint, small, medium, and large.
- Appearance of the colony surface. Bacterial colonies are frequently shiny and smooth in appearance. Other surface descriptions might be: dull (opposite of glistening), veined, rough, wrinkled (or shriveled), or glistening.
- Consistency/Texture. Several terms that may be appropriate for describing the texture or consistency of bacterial growth are: dry, moist, viscid (sticks to loop, hard to get off), brittle/friable (dry, breaks apart), mucoid (sticky, mucus-like).
Rhizobacteria are root-associated bacteria that can have a detrimental (parasitic varieties), neutral or beneficial effect on plant growth. The name comes from the Greek rhiza, meaning root. The term usually refers to bacteria that form symbiotic relationships with many plants ( mutualism ).
Rhizobia are a "group of soil bacteria that infect the roots of legumes to form root nodules ". [2] . Rhizobia are found in the soil and, after infection, produce nodules in the legume where they fix nitrogen gas (N 2) from the atmosphere, turning it into a more readily useful form of nitrogen.
Jan 30, 2018 · Rhizobia are some of the best-studied plant microbiota. These oligotrophic Alphaproteobacteria or Betaproteobacteria form symbioses with their legume hosts. Rhizobia must exist in soil...
- Philip Poole, Vinoy Ramachandran, Jason Terpolilli
- 2018
Varies from round to irregular to filamentous and rhizoid (root-like) SIZE OF COLONY Can vary from large colonies to tiny colonies less than 1 mm = punctiform (pin-point).
Jun 7, 2016 · Irregular colonies that spread rapidly over a plate should be identified as spreading in addition to irregular. A branching structure distinguishes rhizoid from filamentous. Punctiform colonies are distinguished from circular colonies by their very small size. Spindle colonies are lens-shaped. 3. Elevation.
Feb 11, 2022 · The rhizosphere is enriched in Bacteroidetes, Proteobacteria, and other copiotrophs. Highly modular but unstable bacterial networks in the rhizosphere (common for r -strategists) reflect the interactions and adaptations of microorganisms to dynamic conditions.
