Cleavage polyembryos as explants for plant regeneration in wheat.

The increased efficiency of embryogenic callus formation and regeneration of plantlets was the result of using immature induced polyembryos of wheat rather than single embryos as primary explants. Plant regeneration was effected via embryogenesis, organogenesis, and a combined process beginning as embryogenesis and proceeding as organogenesis.

[Microscopical study of the first developmental phases of the embryo and endosperm of jasione montana L. in the living ovules].

Growth of the zygote and the first phases of the endosperm development of Jasione montana L. in isolated intact ovules was studied. The zygote begins to grow simultaneously with the first division of the primary endosperm nucleus.