Polyembryonic Seedlings and the Relationship Between Apomixia and theOccurrences of Polyembryonic Seedlings in Chinese Chive DEVELOPMENT AND CHARACTER OBSERVATION OF AUTOTETRAPLOID POLYEMBRYONIC MUTANT RICE INDUCED BY ION BEAM IMPLANTATIOON Morphological Observation on “Polyembryonic Seedling” of Rice Growth and Photosynthesis of Phoebe zhennan Polyembryonic Seedlings under Different Fertilizer Levels