关键词: 银杏, 雌配子体, 颈卵器, 结构发育

Abstract: Following approximately a dozen of multiple divisions of producing about 2000 nuclei, the cell wall of the female gametophyte of Ginkgo biloba began to form centripedally. The archegonial initials could be distinguished from the peripheral cells at the micropyle end of the female gametophyte before the completion of the wall formation where the cell wall had reached the center of the gametophyte. Usually there were two archegonia in a female gametophyte which developed asynchronously at first, and gradually developed in concert. Great structural and morphological changes in the neck cell and the central cell took place during the archegonial development. The two neck cells of the archegonium divided to form four neck cells before fertilization, this division happened prior to the division of the central cell, but at times they divided synchronously. The initiation and development of archegonia in Gingko, compared with those of cycads, were liked to be more primitive at the evolutional level.

Key words: Ginkgo biloba, archegonia, female gametopyhte, structure development