Abstract

The root formation is composed of two steps: In the first step, root primordia are initiated, and in the second step these primordia are elongated. The Dolichos epicotyl assay was based on the ability of auxin to stimulate the primordium initiation of Dolichos epicotyl sections inserted into a medium solidified with 7-g/l agar. The effects of the auxins at various concentrations and the substances extracted in the plant materials on the epicotyl sections were demonstrated and explained in this paper. The roles of auxin and the rooting ability of the bamboo, rose and Lolium longiflorum cuttings were discussed.