FERTILIZATION IN ARACHIS HYPOGEAE L
Xing Shuping; Xi Xiangyuan(Dept. of Basic Courses, Shandong Agri. Univ., Taian,China, 271018)
The whole process of double fertilization in Arachis hypogeaae L. was examined. Self-pollination occurs 2-4hr. before anthesis. The pollen grain germinates on the stigma and the pollen tube grows along the hollow style canal into the ovary chamber at the funicle side and enters the micropyle. The pollen tube passes through the intercellular space of the nucellar cap cells and penetrates the synergid at the 9thhr. after anthesis (A. A. ). The rate of the pollen tube entering the synergids proximal to the funicle is 61. 6%. At the twelfthhr. A. A., one sperm comes in contact with the egg cell.At the 14thhr. A. A., the sperm nucleus has entered the egg cell and lies on the egg nucleus. The zygote is formed at 21st-26thhr. A. A.,By the 27thhr. A. A., the zygote undergoes mitosis. At the 13thhr. A. A., the another sperm nucleus and the polar nucleus or the secondary nucleus contact each other. The primary endosperm nucleus is formed at the 17thhr. A. A., By the 18thhr. A. A., the mitosis of the primary endosperm nucleus occurs.
【CateGory Index】： S565.203.2