Abstract: In vitro morphogenesis and differentiation pathways of three leaf callus and rep roduction block mass (RBM) of aerial root in Anthurium andraeanum‘Arizona’were studied. The results showed that in the three callus of kelly, yellow and brown color, the karyop lasm ratio decrease in turn, cell arrangement became looser and looser, the shape of cell was not in its integrity. Some similar apoptotic bodies appeared in cells of yellow and brown callus, and these cells apop tosis eventually. The morphogenesis of aerial roots of leaf were indirect organogenesis. RBM derived from the cortex of aerial root cut. There were a lot of dense small cell groups in RBM, the cells divided vigorly, and theywere original tissue of differentiation, and differentiated infinitive buds gradually. Morphogenesis pathway was mainly indirect organogenesis, and had few embryoid morphogenesis pattern. Small cell groups were the foundation of differentiating infinitive buds. Merismatic cells mainly derived from the inside of RBM, and belonged to ingenesis. With the ceaseless growth of small cell group, the outer layer cells apop tosis gradually. Finally the buds broke through RBM and became young plants.

Key words: Anthurium andraeanum, Callus, Rep roduction block mass (RBM), Morphogenesis