| Abstract: | Microorganisms utilizing an opine as the sole carbon source were recovered from crown gall tumors, soil, and surface-disinfected potato tubers. The effect of the opines octopine, nopaline, succinamopine, and mannopine as selective substrates was compared with that of the auxin indoleacetic acid. Selection on octopine and indoleacetic acid favored the fluorescent pseudomonads, whereas mannopine allowed the frequent recovery of agrobacteria. Coryneforms which utilized succinamopine or mannopine were detected in soil, but not in tumors. Fungi growing on succinamopine or mannopine and a mannopine-utilizing Pseudomonas putida were isolated from tumor and soil, respectively. |
