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Polyembryony and Multiple Seedlings in the Apomictic Plants Study on the Structure and Genetic Polymorphism of Embryo Sac in Polyembryonic Rice Strain AP Ⅳ Embryological Observation on the Apomictic Rice-ApⅢ (Shuang 13) Cytoembryological Studies on Polyembryonic Line SB-1 of Oryza sativa: Polyembryong and Its Origin Morphological Observation on “Polyembryonic Seedling” of Rice Growth and Photosynthesis of Phoebe zhennan Polyembryonic Seedlings under Different Fertilizer Levels STUDIES ON SOMATIC EMBRYOGENESIS FROM CELL SUSPENSIONCULTURE OF LOBLOLLY PINE DEVELOPMENT AND CHARACTER OBSERVATION OF AUTOTETRAPLOID POLYEMBRYONIC MUTANT RICE INDUCED BY ION BEAM IMPLANTATIOON Abnormal Behavior of Nuclei and Microtubule (MT) Organizational Changes During Embryo Sac Development in the Poly-Egg Mutant, APⅣ of Rice Embryogenesis of Polyembryonic Rice ApⅢ: Structural and Histochemical Studies of Egg Apparatus Around Fertilization Polyembryonic Seedlings and the Relationship Between Apomixia and theOccurrences of Polyembryonic Seedlings in Chinese Chive Fertilization of Different Types of Embryo Sacs and Its Embryo Formation in Polyembryonic Rice Strain APⅣ Formation and Development of Different Types of Embryo Sacs in Polyembryonic Rice Strain APⅣ OBSERVATION AND ANALYSIS ON THE LOCATION OF EMBRYO AND SEEDLING IN POLYEMBRYONIC RICE 麦类作物多胚的研究 Ⅰ.麦类作物多胚的自然发生