MUTAGENIC EFFECTS AND MECHANISM OF WINTER WHEAT IRRADIATED BY SYNCHROTRON RADIATION(SOFT X\|RAY) Ⅲ FREE RADICALS AND UNSCHEDULED DNA SYNTHESIS OF IRRADIATED SEEDS MUTAGENIC EFFECTS AND MECHANISM OF SYNCHRONOUS RADIATION(SOFT X\|RAY) ON WINTER WHEAT Ⅱ THE OBSERVATION ON ULTRASTRUCTURE OF SEEDLING LEAF CELLS CYTOLOGICAL EFFECTS OF SYNCHRONOUS IRRADIATION(SOFT X\|RAYS)ON RICE