【摘要】 本工作对蚕豆的双受精过程进行了较为详细的观察,得到如下结果。 1.开花20小时以后,花粉管可以到达珠孔。2.开花后约24小时,二个精子分别进入卵细胞核和极核。此后精子的染色质逐渐松散,露出雄性核仁,它在卵细胞核中增大体积,待与卵核仁同样大小以后,二个核仁开始相互融合。3.开花后约30小时,完成核仁的融合而形成具一个大核仁的合子。4.精子先与一个极核融合,其过程和它与卵核的融合过程基本相同。三核融合常在有丝分裂开始之后才完成。5.蚕豆的受精作用属有丝分裂前类型。6.受精前,卵细胞核中有少量孚尔根正反应的颗粒,极核中更少,受精后孚尔根反应增强。更多还原

【Abstract】 Detailed observation on the process of double fertilization in vicia faba was made in the present work. The results are summarized as follows: 1. 20 hours after anthesis, the pollen tube has reached the micropyle of the ovule. 2. 24 hours after anthesis the two sperms entered into the egg nucleus and the polar nucleus respectively. As soon as the gradual despiralization of male spireme takes place, a male nucleolus arises from it, at first as a small drop, which gradually increases in size until the same as the female one, and then fuses with the female nucleolus. 3. About 30 hours after anthesis, the fusion of female and male nucleoli is completed, and then the formation of a larger nucleolus is appeared in the zygote. 4. The fusion of the second sperm with the polar nucleus takes place in Very much the same way as syngamy. Triple fusion are frequently. completed after mitosis. 5. The fertilization of vicia faba is of the premitotic type. 6. Before fertilization, small amount of granules gives a positive Feulgen reaction in the egg nuelei but less so in the polar nuclei.更多还原