Recherches sur la biosynthèse de la biotine dans les méristèmes radiculaires dePisum en culture aseptique

Summary

(1) Biotin (vitamine H) is synthesized by isolated pearoots cultured aseptically in a synthetical medium. The biotin-content of the dry material from 9 passages over a period of 150 days shows more or less constant values, which proves that the root is highly autonomic in synthesizing biotin. Nevertheless it is possible, that the leafs of the intact plant might influence in some way the metabolism of biotin of the root.

(2) Nicotinamide is not an essential factor for undertaining growth of roots, but in its presence biotin-values are remarkably increased. Nicotinamide might be regarded as a complementary factor for the race ofPisum investigated.