Action of Streptomycin on Plant Tumours

IN previous reports on the effect of streptomycin on plant tumours produced by Phytomonas tumefaciens , it was stated that this antibiotic substance would cure a variety of plants of crown-gall 1 , and that it killed tumour tissue in these galls without influencing normal cells 2 . To obtain more information about the action of this agent, experiments were performed using in vitro methods which made possible more exact control of dosage and closer observation of effects.