LAUSR

This study aimed to investigate the effects of certain nutrient medium types enhanced with plant-growth regulators on the direct inductionof somatic embryogenesis in vegetative strains produced and propagated from a tissue culture of Digitalis purpurea. The results showthat MS medium was superior to other tested nutrient media-B5, LS, and 5C01—in terms of the days required to initiate direct somaticembryogenesis induction and induction rate. In contrast, the LS medium resulted in the highest number of embryos. Moreover, 2 mg/LBA (benzyl adenine) was superior to similar concentrations of BAP (benzyl aminopurine) and Kin (kinetin) in the MS medium, whereasBAP performed better in LS and B5. On the other hand, auxin 2.4D (dichlorophenoxy acetic acid) inhibited somatic embryogenesis, as didNAA (naphthalene acetic acid) and IAA (indole acetic acid) when added individually. Regarding the type of explant, the stems showedthe induction rates and numbers of direct-somatic embryos produced in all the basic media.Keywords: Digitalis purpurea; Vegetative strains; Direct-somatic embryogenesis; Explant; Basic media