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ULTRASTRUCTURE OBSERVATION OF MAIZE MICROSPORIC EMBRYOGENESIS EFFECTS OF SPACE CONDITIONS ON ULTRASTRUCTURE OF LEAVE IN MAIZE ( Zea mays L.) MUTAGENIC EFFECTS AND MECHANISM OF SYNCHRONOUS RADIATION(SOFT X\|RAY) ON WINTER WHEAT Ⅱ THE OBSERVATION ON ULTRASTRUCTURE OF SEEDLING LEAF CELLS SPERM ULTRASTRUCTURE OF Helicoverpa armigera ANDPRELIMINARY RESEARCH ON CHANGES OF SPERMULTRASTRUCTURE