摘要
有关银杏（CinkgobitobaL．）生殖的研究，早在19世纪后期，Strasbuopr首先作了描述「'］，此后，在这一方面陆续有不少报道。到了本世纪50年代，对于银杏的整个生殖过程已有大致轮廓卜一'］，但是对于生殖各阶段的详细变化，无论在胚胎学或细胞学方面，都有待进一步的观?..
Polarity of megasporocyte in Cinkgo biloba took place before the initiation of meiosis. At first thenucleus of megasporocyte moved from the central portion to the micropyle end and later a vacuole appeared atthe chalazal end and existed throughout the process of meiosis. The meiotic divisions of the megasporocyte wereunequal and nonsynchoronous. The megaspore tetrads were mostly linearly arranged but sometimes T-shaped.T-shaped tetrads were apparently a result from an inclined division of a dyad cell which faced toward the micropyle end. A sequencial difference in the cell size of the tetrad, i. e. the largest at the chalazal end to thesmallest at the micropyle end could be seen at its early developmental stage.
基金
国家自然科学基金
关键词
银杏
大孢子母细胞
大孢子形成
Cinkgo biloba, Megasporocyte, Megaspore formation
