关键词: 柿, 胚胎发育, 胚胎学

Abstract: The embryogenesis of persimmon was mainly studied on the varieties of ‘Kazusa’ and ‘Gaoan Fangshi’．Materials were dehydrated，embedded and cut in Paraffin wax．Th e results were as follows：Th eir ovules Was anatropous，biteguminous and tenuinucellate，archesporium one-celled and functioning directly as the megaspore mother cell．The tetrad ofmegaspores Was linear shaped，with the first cell from the chalazal end being functiona1．The development of the embryo sacs belongs to the ‘polygonum’type．The female gametophyte consists of egg apparatus，central cell and three antipodal cells at the mature embryo sac stage．The filiform apparatus of each synergid was at the micropyle end．The double fertilization belongs to the premitotic type of syngamy．Three antipodal cells were triangularly arrayed．The embryo develops to confornl the‘Solanad’type．Zygote began to divide after anthesis about two weeks．Th e development of endosperm conforms to the nuclear type．The primary endosperm nucleus began to divide 3 days after anthesis．Endosperms began to undergo cellular endosperm stage at the early globular emb ryo stage and almost completed at the cotyledonary emb ryo stage．Many abnorm al phenomena were observed during the development of embryo: Endosperm abortion and the division of zygote did not occur，etc．

Key words: Persimmon, Embryonic development, Embryology