Advances in the Study of the Angiosperm Ovule

As a sexual reproductive organ, ovules have received much attention by botanists. Since the nineteenth century, the morphology, structure, ontogenesis, origin and molecular biology of angiosperm ovules have been studied in detail. The development of research has resolved in part many important problems, such as the origin and molecular mechanism of ovule ontogenesis. But these problems still require further study. The present paper reviews previous research on ovules, and from a survey of the literature, suggests areas for future research on ovules.