8 1The Concept and Characteristics of Mutation Breeding 诱变育种的概念和特点 1. Concept of Mutation Breeding Mutation Breeding /Induced mutation breeding: p 183 Types of mutation: 1)Natural mutation(spontaneous mutation): By cosmic/UV rays 2) Artificial mutation By artificial mutagens) Chemical Mutation (By chemical mutagens) Physical Mutation(By physical mutagens)§1 The Concept and Characteristics of Mutation Breeding 诱变育种的概念和特点 1. Concept of Mutation Breeding Mutation Breeding / Induced mutation breeding: p. 183 Types of Mutation: 1) Natural mutation (spontaneous mutation): By cosmic/UV rays 2) Artificial mutation (By artificial mutagens) • Chemical Mutation (By chemical mutagens) • Physical Mutation (By physical mutagens)