Endosperm/genetics; Oryza/genetics; Plant Proteins/metabolism; RNA, Plant/genetics; Amino Acid Sequence; Anaphase-Promoting Complex-Cyclosome; Cell Cycle Proteins/genetics; Cell Cycle Proteins/metabolism; Cell Enlargement; Cell Nucleus/genetics; Cell Nucleus/metabolism; Cell Size; Cloning, Molecular; Crops, Agricultural/genetics; Crops, Agricultural/growth & development; Crops, Agricultural/metabolism; Endosperm/growth & development; Endosperm/metabolism; Gene Expression Regulation, Plant; Genes, Plant; Mitosis; Molecular Sequence Data; Mutation; Open Reading Frames; Oryza/growth & development; Oryza/metabolism; Plant Components, Aerial/genetics; Plant Components, Aerial/growth & development; Plant Components, Aerial/metabolism; Plant Proteins/genetics; Plant Roots/genetics; Plant Roots/metabolism; Pollination; Schizosaccharomyces/genetics; Schizosaccharomyces/metabolism; Seedlings/genetics; Seedlings/growth & development; Seedlings/metabolism; Transformation, Genetic; Two-Hybrid System Techniques; Ubiquitin-Protein Ligase Complexes/genetics; Ubiquitin-Protein Ligase Complexes/metabolism