Cytogenetical Studies of Some Members of Apocynaceae

Abstract

Paper deals with the cytological studies of Thevetia peruviana, Holarrhena antidysenterica, Carissa spinarum, C. bispinosa, C. carandas, Nerium indicum and Alstonia scholaris. Karyotypes of three varieties of T. peruviana were similar and all the chromosomes has sub-median constrictions. In H. antidysenterica one pair had median while the rest had sub-median constrictions. Meiosis in above mentioned diploid plants was fairly normal except for spindle anomalies in Nerium indicum and Carissa carandas. Artificially induced tetraploids of N. indicum show low multivalent frequency while they were absent in those of Thevetia peruviana.