Abstract
Crown galls induced by infection of tobacco [Nicotiana tabacum cv. Bright Yellow] plants with Agrobacterium tumefaciens strain C58-Cl(pTiB6S3) were excised and cultured in vitro. After .apprx. 1 yr of culture on medium-lacking phytohormones, 2 noncloned lines spontaneously formed shoots. Leaf explants from shoots of tumor-line T5 were capable of growing on hormone-free medium and the resulting mixture of organized and unorganized tissue synthesized octopine. Detached leaves from T5 shoots also synthesized octopine. Shoots from this octopine-type tumor contain transformed cells and are true crown-gall teratomas.