1. Sales E, Müller-Uri F, Nebauer SG, Segura J, Kreis W, Arillaga I (2011) Digitalis. In: Kole C (ed) Wild crop relatives: genomic and breeding resources plantation and ornamental crops. Springer, Berlin Heidelberg, pp 73–112
2. Kreis W, May U, Reinhard E (1986) UDP-Glucose: digitoxin 16’-O-glucosyltransferase from suspension cultured Digitalis lanata cells. Plant Cell Rep 5:442–445
3. Lindemann P, Luckner M (1997) Biosynthesis of pregnane derivatives in somatic embryos of Digitalis lanata. Phytochemistry 46:507–513
4. Shimomura K, Yoshimatsu K, Sauerwein M, Christen P, Toda Y, Aoki T (1992) Production of biologically active compounds by transformed cultures. In: Oono R, Hirabayashi T, Kiruchi S, Handa H, Kahwara S (eds) Plant tissue culture and gene manipulation for breeding and formation of phytochemicals. National Institute of Agrobiological Resources, Tsukuba, Japan, pp 293–296
5. Hagimori M, Matsumoto T, Obi Y (1983) Effects of mineral salts, initial pH and precursors on digitoxin formation by shoot-forming cultures of Digitalis purpurea L. grown in liquid medium. Agri Biol Chem 47:565–571