2. The characteristics of Mutation Breeding a) High frequency and wide spectrum of mutation b) Minor modification of varieties Improvement of oligo-traits in plants c) Breaking linkage of genes /inducing segment translocation 3. Achievements of Mutation Breeding a Worldwide(1990): 1030 varieties b In China(1989): 325 (Rice, wheat, cotton,.)2. The characteristics of Mutation Breeding 3. Achievements of Mutation Breeding a. Worldwide(1990): 1030 varieties b. In China(1989): 325 (Rice, wheat, cotton, …) a) High frequency and wide spectrum of mutation b) Minor modification of varieties Improvement of oligo-traits in plants c) Breaking linkage of genes / inducing segment translocation