被子植物双受精发现100年 : 回顾与展望

CENTENARY ON S.G. NAWASCHIN'S DISCOVERY OF DOUBLE FERTILIZATION:RETROSPECTS AND PROSPECTS

被子植物双受精发现１００年：回顾与展望＠胡适宜￥北京大学生命科学学院被子植物，双受精，精细胞，卵细胞被子植物双受精发现１００年：回顾与展望胡适宜（北京大学生命科学学院北京１００８７１）关键词被子植物，双受精，精细胞，卵细胞ＣＥＮＴＥＮＡＲＹＯＮＳ．Ｇ．Ｎ...

A review on the double fertilization in angiosperm is addressed at its centennial discovery by S.G. Nawaschen. Studies in the first 50 years mainly by light microscopy had defined this process of double fertilization as a general characteristic in angiosperms. In the later 50 years research works in this field have been greatly advanced on account of the developing new techniques especially the electronmicroscopy. The topics in this review include: (1) The growth of pollen tube entering the embryo sac: role of the synergid in the pollen tube receiption and signals from the degenerated synergid.(2) The arrival of male gametes to female gametes: structure and function of the male germ unit, the function of cytoskeleton in the delivery of sperm cells.(3) Gametic fusion: the structure and function of the female germ unit, gametic membrane fusion, karyogamy, DNA contents in sperm and egg nuclei, the relationship between the karyogamy and cell cycle, sperm dimorphism and preferential fertilization, and spermegg recognition. Future directions for the research of double fertilization are also recommended.