TABLE 2.
Utilization of heterologous siderophores by P. putida N1R Pvd−
| Test strain | Siderophore production phenotype | Cross-feeding of N1R Pvd−a |
|---|---|---|
| P. putida | ||
| N1R | Pvd+ | + |
| N1R Pvd− | Pvd− | − |
| WCS358 | Pvd+ | + |
| WCS358 Pvd− | Pvd− | − |
| E. cloacae | ||
| JL1157 | Ent+ Iuc+ | + |
| LA122 | Ent+ Iuc− | + |
| LA266 | Ent− Iuc+ | + |
| LA235 | Ent− Iuc− | − |
a
The capacity of N1R Pvd− to utilize siderophores produced by test strains was detected in a cross-feeding assay. Molten KMB amended with 600 μg of 2,2′-dipyridyl per ml was seeded with 105 CFU of the indicator strain P. putida N1R Pvd− per ml. +, zone of growth surrounding colonies of test strains indicated siderophore cross-feeding; −, no detectable zone. The experiment was done three times with identical results.