L'Indole et le Tryptophane "régulateurs" de croissance, en culture "in-vitro", pour les tissus de parenchyme médullaire de Tabac, normaux et tumoraux

Indoleacetic acid, tryptophan and indole promote growth of pith tissues of tumorous Nicotiana glauca×N. langsdorffii amphidiploïd hybrid, but only indoleacetic acid gives the potentiality of continuous development to the tumorous tissues after some days of contact on a medium without growth substances. In combination with 6-benzylaminopurine, tryptophan and especially indole are promoting substances like auxin for the non-tumorous pith tissues of tobacco, and allow a considerable organogenesis.