A New Method for Embryo Sac Isolation and In Situ Fusion of Egg and Synergid Protoplasts in Nicotiana tabacurn Cytoplasmic Nucleoids in the Generative Cell, Sperm Cell and Egg Cell of Calystegia heder acea Single-Pair Fusion of Various Combinations Between Female Gametoplasts and Other Protoplasts in Nicotiana tabacum A Study on the Crossability of Species between Group A and B in the Section Batatas of Genus Iponoea Primary Study on the Archegonium Formation and Oogenesis in the Fern Phymatosorus hainanensis Gamete Recognition in Higher Plants: An Abstruse but Charming Mystery Isolation of Embryo Sac Cells of Lettuce (Lactuca sativa) Formation and Development of Archegonium in the Fern Ceratopteris thalictroides(L.)Brongn Ultracytochemical Localization of Calcium in the Gynoecium and Embryo Sac of Rice Distribution of Trans zeatin, GA7/4, (+)ABA and IAA in Tobacco Egg Cells Before and After Fertilization: Immunogold Electron Microscopic Observations Isolation of Egg Cells and Zygotes in Oryza sativa Centenary on S.G.Nawaschin‘s Discovery of Double Fertilization: Retrospects and Prospects Ultrastructures of the Egg Apparatus and the Central Cell of Calystegia hederacea (Convolvulaceae) Before and After Fertilizati on Changes of Plastids Mitochondria and Their DNA in the Egg Cell Before and After Fertilization in Pharbitis