Polyploid Breeding in Portulaca grandiflora L.

抄録

An autotetraploid was raised as a result of colchicine treatment in double whorlled, pink coloured variety of Portulaca grandiflora. In C₂, segregants in different proportions with regard to number of floral whorls (1-∞), were observed. Selfed seeds from C₂of individual type, showed further segregation in C₃. Studies indicated that this trait is controlled by multiple gene system. Although, pollen sterility was not significantly affected by different number of whorls, however, seed setting showed direct correlation with number of whorls. Gynoecium and staminal transformation into petaloid structures was noted. The possible cumulative, pleotropic effects of present multiple gene system has been discussed.