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EFFECTS OF CHEMICAL MUTAGENS ON THE INDUCTION AND THE DIFFERENTIATION OF POLLEN CALLUS AND CHARACTER VARIATIONS OF POLLEN-PLANTS IN RICE EFFECT OF ~(60) Co γ IRRADIATION WITH SEED AND SHOOT-TIP OF Brassica campestris L.var ON ITS CULTURE IN VITRO MUTAGTNIC EFFECT OF SOME NEW MUTAGENS ON RICE MUTAGENtC EFFECTS OF JOINT TREATMENT WITH γ-RAY AND CHEMICAL MUTAGENS ON SOYBEAN RESEARCH ADVANCES IN PASTURE MUTATION BREEDING IN CHINA STUDY ON THE SCREENING OF HIGH-PRODUCING WANLONGMYCIN STRAIN BY NITROGEN ION BEAM JMPLANTATION TECHNIQUE