| Abstract: | Abstract Nucellar embryogenesis in undeveloped ovules in some navel orange cultivars. - Nucellar embryogenesis has been studied in some cultivars of navel orange, Citrus sinensis (L.) Osbeck. Histological observations have been carried out in undeveloped ovules excised 2, 4, 6, 8 months after anthesis. Ovules under study derived a) from flowers naturally pollinated or hand-pollinated with pollen of Poncirus trifoliata (L.) Raf.; b) from emasculated flowers, and c) from flowers deprived of stigma. In absence of pollination, as well as in absence of fertilization, the nucellar embryos reached the globular stage. |
