摘要
糜子(Panicum miliaceum L.)受精的全过程在开花后3小时内完成。开花后20分钟,花粉管到达珠孔,30分钟进入胚囊并释放精子;雌、雄性核融合发生在开花后30分钟至3小时。精核与卵核和极核融合的过程基本相同,但总是先完成与极核的融合。开花后2小时,初生胚乳核形成,随后立即分裂。开花后3小时,合子形成,此时胚乳含两个游离核。开花后8—10小时,合子进入分裂期。合子的休眠期约5—7小时。受精作用属于有丝分裂前配子融合的类型。
Detailed studies on the double fertilization process and its duration of different stages in Panicum miliaceum L. were conducted. The main results are summarized as follows: The whole process of fertilization completes in 3 h after anthesis. The pollen tube reaches the mi- cropyle of ovule in 20 min and enters the embryo sac and releases sperms 30 min after anthe- sis. The fusion of female and male nuclei occurs in a period of 30 min to 3 h after anthesis. The process of syngamy is almost the same as that of triple fusion, however, triple fusion ends always earlier. Primary endosperm nucleus forms 2 h after anthesis, and then divides. Zygots forms 3 h after anthesis when endosperm contains two free nuclei.The first mitotic division of zygote takes place 8-10 h after anthesis. Zygote has a dormancy period of 5--7 h. The double fertilization is a type of premitotic syngamy.
关键词
糜子
双受精
细胞学
禾本科
Panicum miliaceum L.
Double fertilization
