Wheat rootlet growth inhibition test of Rwandese medicinal plants: active principles of Tetradenia riparia and Diplolophium africanum.

A series of 50 medicinal plants of Rwanda (121 plant samples) has been screened for wheat rootlets inhibition activity. The minimum inhibitory concentration (MIC) of the active principle of Tetradenia riparia, i.e. 8(14),15-sandaracopimaradiene-7 alpha, 18-diol (7.81 micrograms/ml), and of the active principle of Diplolophium africanum, i.e. scoparone (62.5 micrograms/ml), in this test was determined.