Effects of 137Cs γ-rays Irradiation and NaN3 Treatment on Germination Rate and Protective Enzyme Activity for Seeds of Phyllostachys heterocycla cv. Pubescens A Research on the Cold-Resistance of Induced Alfalfa Calluses Effects of the Application of Different Concentrations of NaN3 for Different Times on the Morphological and Cytogenetic Characteristics of Barley (Hordeum vulgare L.) Seedlings M_1 MUTAGENIC EFFECT ON SOYBEAN INDUCED BY NaN_3 MUTAGENIC EFFECTS OF ~(137)Cs GAMMA RAY AND SODIUM AZIDE COMBINED TREATMENT ON RICE(Oryza sativa L. ) CONSTRUCTION OF MUTANT LIBRARY FOR SOYBEAN "Nannong 94-16" AND ANALYSIS OF SOME CHARACTERS EFFECT OF GENOTYPE OF APPLE ON in vitro REGENERATING CHARACTERISTICS AND ITS in vitro INDUCING MUTATION WITH NaN 3 Effects of KCN and NaN3 Pretreatment on the Cyanide-Resistant Respiration in Tobacco Callus