Isolation
Selective media can be used to isolate R. rhizogenes from roots, soil, and tumors. R. rhizogenes is resistant to toxic amounts of tellurite (K2TeO3). One example of a selective media is 2E-Te, containing erythritol (see Table 1) with 320mg/L K2TeO3. R. rhizogenes and R. radiobacter have similar colony morphology on tellurite-selective media. Colonies have circular morphology and are black in color with a metallic shine (4). However, the components in the 2E-Te media are more selective for R. rhizogenes than R. radiobacter.