Abstract
Rhizome induction activities of the s-triazines and synthetic cytokinins were measured on Cyperus serotinus ROTTB. tuber in the dark. The (R)-enantiomers of 2-α-methylbenzylamino-6-chloro-s-triazine compounds having a small alkyl group at 4-amino moiety stimulated the rhizome induction. Medium sized or long-chain alkylamino groups (butyls to decyl) resulted in decrease in activity. Their (S)-antipodes did not cause the rhizome induction. The racemates substituted with an ethyl or propyl group at the benzylic position of the 2-benzyl-amino-4-methyl (or ethyl) amino-6-chloro-s-triazines also exhibited a significant rhizome inducing activity. The activity of the methoxy or methylthio derivatives of corresponding chloro-s-triazines that was active on rhizome induction was maintained. An s-triazine ring system was essential for the rhizome induction. Kinetin and synthetic cytokinin compounds, forchlorfenuron [1-(2-chloro-4-pyridyl)-3-phenylurea] and thidiazuron [1-phenyl-3-(1, 2, 3-thidiazol-5-yl)urea], significantly stimulated rhizome induction similar to 6-benzylamino-purine (BA).
