【摘要】 本文报道了凤眼莲的受精过程及胚和胚乳的发育。授粉后3～8小时,花粉管穿过花柱;17～21小时,花粉管经珠孔到达胚囊;约48小时,一个精子进入卵细胞;3天完成受精作用;5天出现两细胞原胚。胚的发育属紫菀型,经历原胚、球型胚、椭圆形胚、凹形胚、棒形胚等各个时期。凤眼莲的胚乳发育属沼生目型,授粉后约19～21小时,另一精于与次生核融合形成游离核;2～5天形成大量的胚乳游离核;6天开始形成胚乳细胞壁。约20～21天,种子成熟,种子含胚和胚乳。更多还原

【Abstract】 This paper presents detailed report on the process of fertilization and the development of embryo and endosperm of Eichhornia crassipes(Mart.) Solms.The results obtained are summarized as follows:About 3～8 hours after pollination,the pollen tube passed through the style;17～21 hours the pollen tube reached the embryo sac through the micropyle;About 48 hours, one sperm nucleus entered the egg,the fertilization completed in 3 days. After 5 days,two-celled proembryo was first shown.The development of the embryo of Eichhornia crassipes(Mart.)Solms conforms to the Aster’s type and goes through the following stage:proembryo,globular,ellipsoidal, laterally concave,stick-shaped and mature embryo.The development of endosperm of Eichhornia crassipes(Mart.)Solms conforms to the Helobial type,about 19～20 hours after pollination,the other sperm nucleus entered the secondary nucleus,and the free nuclei period began;in 2～5 days,a large amount of free nuclei of endosperm were rapidly formed;after 6 days,the formation of endosperm cell began at the micropolar;about 20～21 days,the seed matured and contained embryo and rich endosperm.更多还原