Observation on Micronucleolus during Meiosis of Pollen Mother Cell in Cucumber Cytological Investigation of Taiwania flousiana Gaussen (Taxodiaceae) Ultrastructural Changes of the Nucleolus During Cell Cycle in Triticum aestivum Electron Microscopic Studies on the Silver-stained Nucleolar Cycle of Physarum polycephalum STUDIES ON THE ASSOCIATION OF NUCLEOLUS AND NOR-CHROMOSOME IN MAIZE ROOT TIP CELLS THROUGH THE MODIFIED GIEMSA BANDING TECHNIQUE Transcriptive Sites of RNA PolymeraseⅠin the Nucleolus of Triticum aestivum Revealed by BrUTP Labelling and Immunoelectron Microscopy Mininucleolus: An Intranuclear Body Enriched with the Splicing Factor SC35 THE APPLICATION OF PRINCIPAL COMPONENT ANALYSIS ON MAINLY ECONOMIC CHARACTERS AND SUPERIOR VARIETY SELECTION OF APRICOT FOR NUCLEOLUS USING Microsporogenesis and Variation in Pollen Size of Populus×xiaozhuanica ‘Baicheng-2’ Ni^2+和Cu^2+离子对蚕豆根生长和根尖核仁的影响